1437 找到的項目
弱點
Abstract
除錯程式碼可能會影響效能或洩露敏感資料給攻擊者。
Explanation
開發作業一般會為了除錯或測試目而增加一些「後門」程式碼,這些程式碼不會隨應用程式一起提供或部署。當這類除錯程式碼意外地留在應用程式中時,會導致應用程式開放在未預期的互動模式。這些後門入口點很容易造成安全問題,因為在設計或者測試期間,並沒有將它們考慮在內,並且不會出現在應用程式設計中的操作環境中。
References
[1] Standards Mapping - Common Weakness Enumeration CWE ID 489
[2] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[3] Standards Mapping - OWASP Application Security Verification Standard 4.0 14.3.2 Unintended Security Disclosure Requirements (L1 L2 L3), 14.2.2 Dependency (L1 L2 L3)
[4] Standards Mapping - OWASP Top 10 2007 A6 Information Leakage and Improper Error Handling
[5] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[6] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.10
[7] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.5.6
[8] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.5
[9] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.5
[10] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.5
[11] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.5
[12] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.5
[13] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[14] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[15] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 3.6 - Sensitive Data Retention
[16] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 3.6 - Sensitive Data Retention
[17] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 3.6 - Sensitive Data Retention
[18] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3620 CAT II
[19] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3620 CAT II
[20] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3620 CAT II
[21] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3620 CAT II
[22] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3620 CAT II
[23] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3620 CAT II
[24] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3620 CAT II
desc.semantic.golang.go_bad_practices_leftover_debug_code
Abstract
建立一個已啟用 GraphiQL 的 GraphQL 端點。
Explanation
GraphiQL 是一種瀏覽器內工具,它利用 GraphQL 結構描述自我檢查機制為 GraphQL API 開發和測試提供圖形介面。GraphiQL 可協助使用者探索 GraphQL 結構描述以及撰寫和執行 GraphQL 查詢。

不建議允許存取生產階段中的 GraphiQL,因為透過 GraphiQL 啟用 GraphQL 結構描述的自我檢查,可能會使您的整體安全態勢面臨風險。攻擊者可能使用 GraphiQL 和自我檢查從 GraphQL 結構描述中取得實作詳情,進而使他們能夠執行更具目標性的攻擊。GraphQL 結構描述可能會洩漏資訊,例如內部使用的欄位、描述和過時說明,這些資訊可能非供公開使用。

範例 1:以下程式碼將初始化一個預設啟用 GraphiQL 的 GraphQL.js 端點:

app.use('/graphql', graphqlHTTP({
schema
}));
References
[1] OWASP OWASP Cheat Sheet Series: GraphQL Cheat Sheet
[2] Standards Mapping - Common Weakness Enumeration CWE ID 94
[3] Standards Mapping - Common Weakness Enumeration Top 25 2019 [18] CWE ID 094
[4] Standards Mapping - Common Weakness Enumeration Top 25 2020 [17] CWE ID 094
[5] Standards Mapping - Common Weakness Enumeration Top 25 2022 [25] CWE ID 094
[6] Standards Mapping - Common Weakness Enumeration Top 25 2023 [23] CWE ID 094
[7] Standards Mapping - Common Weakness Enumeration Top 25 2024 [11] CWE ID 094
[8] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001167
[9] Standards Mapping - FIPS200 CM
[10] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[11] Standards Mapping - NIST Special Publication 800-53 Revision 4 SC-18 Mobile Code (P2)
[12] Standards Mapping - NIST Special Publication 800-53 Revision 5 SC-18 Mobile Code
[13] Standards Mapping - OWASP API 2023 API8 Security Misconfiguration
[14] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.2.5 Sanitization and Sandboxing Requirements (L1 L2 L3), 5.2.8 Sanitization and Sandboxing Requirements (L1 L2 L3), 5.3.6 Output Encoding and Injection Prevention Requirements (L1 L2 L3)
[15] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[16] Standards Mapping - OWASP Mobile 2024 M8 Security Misconfiguration
[17] Standards Mapping - OWASP Top 10 2004 A10 Insecure Configuration Management
[18] Standards Mapping - OWASP Top 10 2010 A6 Security Misconfiguration
[19] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration
[20] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration
[21] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.10
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.8
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.8
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.8
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.8
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 5.4 - Authentication and Access Control
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 5.4 - Authentication and Access Control
[31] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 5.4 - Authentication and Access Control, Control Objective C.2.3 - Web Software Access Controls
[32] Standards Mapping - SANS Top 25 2009 Risky Resource Management - CWE ID 094
[33] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3600 CAT II
[34] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3600 CAT II
[35] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3600 CAT II
[36] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3600 CAT II
[37] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3600 CAT II
[38] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3600 CAT II
[39] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3600 CAT II
[40] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-003300 CAT II
[41] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-003300 CAT II
[42] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-003300 CAT II
[43] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-003300 CAT II
[44] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-003300 CAT II
[45] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-003300 CAT II
[46] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-003300 CAT II
[47] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-003300 CAT II
[48] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-003300 CAT II
[49] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-003300 CAT II
[50] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-003300 CAT II
[51] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-003300 CAT II
[52] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-003300 CAT II
[53] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-003300 CAT II
[54] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-003300 CAT II
[55] Standards Mapping - Web Application Security Consortium Version 2.00 Application Misconfiguration (WASC-15)
desc.structural.javascript.graphql_bad_practices_graphiql_enabled
Abstract
建立一個已啟用 GraphiQL 的 GraphQL 端點。
Explanation
GraphiQL 是一種瀏覽器內工具,它利用 GraphQL 結構描述自我檢查機制為 GraphQL API 開發和測試提供圖形介面。GraphiQL 可協助使用者探索 GraphQL 結構描述,以及撰寫和執行 GraphQL 查詢。

不建議允許存取生產階段中的 GraphiQL,因為透過 GraphiQL 啟用 GraphQL 結構描述的自我檢查,可能會使您的整體安全態勢面臨風險。攻擊者可能使用 GraphiQL 和自我檢查從 GraphQL 結構描述中取得實作詳情,進而使他們能夠執行更具目標性的攻擊。GraphQL 結構描述可能會洩漏資訊,例如內部使用的欄位、描述和過時說明,這些資訊可能非供公開使用。

範例 1:以下程式碼將初始化一個已啟用 GraphiQL 的 GraphQL 端點:

app.add_url_rule('/graphql', view_func=GraphQLView.as_view(
'graphql',
schema = schema,
graphiql = True
))
References
[1] OWASP OWASP Cheat Sheet Series: GraphQL Cheat Sheet
[2] Standards Mapping - Common Weakness Enumeration CWE ID 94
[3] Standards Mapping - Common Weakness Enumeration Top 25 2019 [18] CWE ID 094
[4] Standards Mapping - Common Weakness Enumeration Top 25 2020 [17] CWE ID 094
[5] Standards Mapping - Common Weakness Enumeration Top 25 2022 [25] CWE ID 094
[6] Standards Mapping - Common Weakness Enumeration Top 25 2023 [23] CWE ID 094
[7] Standards Mapping - Common Weakness Enumeration Top 25 2024 [11] CWE ID 094
[8] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001167
[9] Standards Mapping - FIPS200 CM
[10] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[11] Standards Mapping - NIST Special Publication 800-53 Revision 4 SC-18 Mobile Code (P2)
[12] Standards Mapping - NIST Special Publication 800-53 Revision 5 SC-18 Mobile Code
[13] Standards Mapping - OWASP API 2023 API8 Security Misconfiguration
[14] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.2.5 Sanitization and Sandboxing Requirements (L1 L2 L3), 5.2.8 Sanitization and Sandboxing Requirements (L1 L2 L3), 5.3.6 Output Encoding and Injection Prevention Requirements (L1 L2 L3)
[15] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[16] Standards Mapping - OWASP Mobile 2024 M8 Security Misconfiguration
[17] Standards Mapping - OWASP Top 10 2004 A10 Insecure Configuration Management
[18] Standards Mapping - OWASP Top 10 2010 A6 Security Misconfiguration
[19] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration
[20] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration
[21] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.10
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.8
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.8
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.8
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.8
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 5.4 - Authentication and Access Control
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 5.4 - Authentication and Access Control
[31] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 5.4 - Authentication and Access Control, Control Objective C.2.3 - Web Software Access Controls
[32] Standards Mapping - SANS Top 25 2009 Risky Resource Management - CWE ID 094
[33] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3600 CAT II
[34] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3600 CAT II
[35] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3600 CAT II
[36] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3600 CAT II
[37] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3600 CAT II
[38] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3600 CAT II
[39] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3600 CAT II
[40] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-003300 CAT II
[41] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-003300 CAT II
[42] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-003300 CAT II
[43] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-003300 CAT II
[44] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-003300 CAT II
[45] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-003300 CAT II
[46] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-003300 CAT II
[47] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-003300 CAT II
[48] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-003300 CAT II
[49] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-003300 CAT II
[50] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-003300 CAT II
[51] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-003300 CAT II
[52] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-003300 CAT II
[53] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-003300 CAT II
[54] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-003300 CAT II
[55] Standards Mapping - Web Application Security Consortium Version 2.00 Application Misconfiguration (WASC-15)
desc.structural.python.graphql_bad_practices_graphiql_enabled
Abstract
建立 GraphQL 端點而不停用結構描述自我檢查。
Explanation
GraphQL 自我檢查功能讓任何人都可以查詢 GraphQL 伺服器以取得目前結構描述的相關資訊。當事人可以發出 GraphQL 自我檢查查詢來擷取結構描述的可用操作、資料類型、欄位和文件的完整檢視。

GraphQL 自我檢查在開發和共用有關 GraphQL API 的資訊的環境中提供重要的公用程式。自我檢查是一個強大的 GraphQL 功能,可以促進與各種工具的整合。例如,IDE 可以利用結構描述自我檢查來提供用於開發和測試 GraphQL API 的增強功能。

但是,允許任何人在生產階段中查詢您的 GraphQL 結構描述,可能會使您的整體安全態勢面臨風險。攻擊者可能使用自我檢查從 GraphQL 結構描述中取得實作詳情,進而使他們能夠執行更具目標性的攻擊。GraphQL 結構描述可能會洩漏資訊,例如內部使用的欄位、描述和過時說明,這些資訊可能非供公開使用。

範例 1:以下程式碼將初始化一個預設啟用結構描述自我檢查的 Hot Chocolate GraphQL 端點:

services
.AddGraphQLServer()
.AddQueryType<Query>()
.AddMutationType<Mutation>();
References
[1] OWASP OWASP Cheat Sheet Series: GraphQL Cheat Sheet
[2] Standards Mapping - Common Weakness Enumeration CWE ID 94
[3] Standards Mapping - Common Weakness Enumeration Top 25 2019 [18] CWE ID 094
[4] Standards Mapping - Common Weakness Enumeration Top 25 2020 [17] CWE ID 094
[5] Standards Mapping - Common Weakness Enumeration Top 25 2022 [25] CWE ID 094
[6] Standards Mapping - Common Weakness Enumeration Top 25 2023 [23] CWE ID 094
[7] Standards Mapping - Common Weakness Enumeration Top 25 2024 [11] CWE ID 094
[8] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001167
[9] Standards Mapping - FIPS200 CM
[10] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[11] Standards Mapping - NIST Special Publication 800-53 Revision 4 SC-18 Mobile Code (P2)
[12] Standards Mapping - NIST Special Publication 800-53 Revision 5 SC-18 Mobile Code
[13] Standards Mapping - OWASP API 2023 API8 Security Misconfiguration
[14] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.2.5 Sanitization and Sandboxing Requirements (L1 L2 L3), 5.2.8 Sanitization and Sandboxing Requirements (L1 L2 L3), 5.3.6 Output Encoding and Injection Prevention Requirements (L1 L2 L3)
[15] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[16] Standards Mapping - OWASP Mobile 2024 M8 Security Misconfiguration
[17] Standards Mapping - OWASP Top 10 2004 A10 Insecure Configuration Management
[18] Standards Mapping - OWASP Top 10 2010 A6 Security Misconfiguration
[19] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration
[20] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration
[21] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.10
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.8
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.8
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.8
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.8
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 5.4 - Authentication and Access Control
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 5.4 - Authentication and Access Control
[31] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 5.4 - Authentication and Access Control, Control Objective C.2.3 - Web Software Access Controls
[32] Standards Mapping - SANS Top 25 2009 Risky Resource Management - CWE ID 094
[33] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3600 CAT II
[34] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3600 CAT II
[35] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3600 CAT II
[36] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3600 CAT II
[37] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3600 CAT II
[38] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3600 CAT II
[39] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3600 CAT II
[40] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-003300 CAT II
[41] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-003300 CAT II
[42] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-003300 CAT II
[43] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-003300 CAT II
[44] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-003300 CAT II
[45] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-003300 CAT II
[46] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-003300 CAT II
[47] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-003300 CAT II
[48] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-003300 CAT II
[49] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-003300 CAT II
[50] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-003300 CAT II
[51] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-003300 CAT II
[52] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-003300 CAT II
[53] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-003300 CAT II
[54] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-003300 CAT II
[55] Standards Mapping - Web Application Security Consortium Version 2.00 Application Misconfiguration (WASC-15)
desc.structural.dotnet.graphql_bad_practices_introspection_enabled
Abstract
建立 GraphQL 端點而不停用結構描述自我檢查。
Explanation
GraphQL 自我檢查功能讓任何人都可以查詢 GraphQL 伺服器以取得目前結構描述的相關資訊。當事人可以發出 GraphQL 自我檢查查詢來擷取結構描述的可用操作、資料類型、欄位和文件的完整檢視。

GraphQL 自我檢查在開發和共用有關 GraphQL API 的資訊的環境中提供重要的公用程式。自我檢查是一個強大的 GraphQL 功能,可以促進與各種工具的整合。例如,IDE 可以利用結構描述自我檢查來提供用於開發和測試 GraphQL API 的增強功能。

但是,允許任何人在生產階段中查詢您的 GraphQL 結構描述,可能會使您的整體安全態勢面臨風險。攻擊者可能使用自我檢查從 GraphQL 結構描述中取得實作詳情,進而使他們能夠執行更具目標性的攻擊。GraphQL 結構描述可能會洩漏資訊,例如內部使用的欄位、描述和過時說明,這些資訊可能非供公開使用。

範例 1:以下程式碼將初始化一個預設啟用結構描述自我檢查的 GraphQL.js 端點:

app.use('/graphql', graphqlHTTP({
schema
}));
References
[1] OWASP OWASP Cheat Sheet Series: GraphQL Cheat Sheet
[2] Standards Mapping - Common Weakness Enumeration CWE ID 94
[3] Standards Mapping - Common Weakness Enumeration Top 25 2019 [18] CWE ID 094
[4] Standards Mapping - Common Weakness Enumeration Top 25 2020 [17] CWE ID 094
[5] Standards Mapping - Common Weakness Enumeration Top 25 2022 [25] CWE ID 094
[6] Standards Mapping - Common Weakness Enumeration Top 25 2023 [23] CWE ID 094
[7] Standards Mapping - Common Weakness Enumeration Top 25 2024 [11] CWE ID 094
[8] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001167
[9] Standards Mapping - FIPS200 CM
[10] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[11] Standards Mapping - NIST Special Publication 800-53 Revision 4 SC-18 Mobile Code (P2)
[12] Standards Mapping - NIST Special Publication 800-53 Revision 5 SC-18 Mobile Code
[13] Standards Mapping - OWASP API 2023 API8 Security Misconfiguration
[14] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.2.5 Sanitization and Sandboxing Requirements (L1 L2 L3), 5.2.8 Sanitization and Sandboxing Requirements (L1 L2 L3), 5.3.6 Output Encoding and Injection Prevention Requirements (L1 L2 L3)
[15] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[16] Standards Mapping - OWASP Mobile 2024 M8 Security Misconfiguration
[17] Standards Mapping - OWASP Top 10 2004 A10 Insecure Configuration Management
[18] Standards Mapping - OWASP Top 10 2010 A6 Security Misconfiguration
[19] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration
[20] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration
[21] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.10
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.8
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.8
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.8
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.8
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 5.4 - Authentication and Access Control
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 5.4 - Authentication and Access Control
[31] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 5.4 - Authentication and Access Control, Control Objective C.2.3 - Web Software Access Controls
[32] Standards Mapping - SANS Top 25 2009 Risky Resource Management - CWE ID 094
[33] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3600 CAT II
[34] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3600 CAT II
[35] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3600 CAT II
[36] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3600 CAT II
[37] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3600 CAT II
[38] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3600 CAT II
[39] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3600 CAT II
[40] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-003300 CAT II
[41] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-003300 CAT II
[42] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-003300 CAT II
[43] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-003300 CAT II
[44] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-003300 CAT II
[45] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-003300 CAT II
[46] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-003300 CAT II
[47] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-003300 CAT II
[48] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-003300 CAT II
[49] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-003300 CAT II
[50] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-003300 CAT II
[51] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-003300 CAT II
[52] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-003300 CAT II
[53] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-003300 CAT II
[54] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-003300 CAT II
[55] Standards Mapping - Web Application Security Consortium Version 2.00 Application Misconfiguration (WASC-15)
desc.dataflow.javascript.graphql_bad_practices_introspection_enabled
Abstract
建立 GraphQL 端點而不停用結構描述自我檢查。
Explanation
GraphQL 自我檢查功能讓任何人都可以查詢 GraphQL 伺服器以取得目前結構描述的相關資訊。任何當事人可以發出 GraphQL 自我檢查查詢來擷取結構描述的可用操作、資料類型、欄位和文件的完整檢視。

GraphQL 自我檢查在開發和共用有關 GraphQL API 的資訊的環境中提供重要的公用程式。自我檢查是一個強大的 GraphQL 功能,可以促進與各種工具的整合。例如,IDE 可以利用結構描述自我檢查來提供用於開發和測試 GraphQL API 的增強功能。

但是,允許任何人在生產階段中查詢您的 GraphQL 結構描述,可能會使您的整體安全態勢面臨風險。攻擊者可能使用自我檢查從 GraphQL 結構描述中取得實作詳情,進而使他們能夠執行更具目標性的攻擊。GraphQL 結構描述可能會洩漏資訊,例如內部使用的欄位、描述和過時說明,這些資訊可能非供公開使用。

範例 1:以下程式碼將初始化一個預設啟用結構描述自我檢查的 GraphQL 端點:

app.add_url_rule('/graphql', view_func=GraphQLView.as_view(
'graphql',
schema = schema
))
References
[1] OWASP OWASP Cheat Sheet Series: GraphQL Cheat Sheet
[2] Standards Mapping - Common Weakness Enumeration CWE ID 94
[3] Standards Mapping - Common Weakness Enumeration Top 25 2019 [18] CWE ID 094
[4] Standards Mapping - Common Weakness Enumeration Top 25 2020 [17] CWE ID 094
[5] Standards Mapping - Common Weakness Enumeration Top 25 2022 [25] CWE ID 094
[6] Standards Mapping - Common Weakness Enumeration Top 25 2023 [23] CWE ID 094
[7] Standards Mapping - Common Weakness Enumeration Top 25 2024 [11] CWE ID 094
[8] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001167
[9] Standards Mapping - FIPS200 CM
[10] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[11] Standards Mapping - NIST Special Publication 800-53 Revision 4 SC-18 Mobile Code (P2)
[12] Standards Mapping - NIST Special Publication 800-53 Revision 5 SC-18 Mobile Code
[13] Standards Mapping - OWASP API 2023 API8 Security Misconfiguration
[14] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.2.5 Sanitization and Sandboxing Requirements (L1 L2 L3), 5.2.8 Sanitization and Sandboxing Requirements (L1 L2 L3), 5.3.6 Output Encoding and Injection Prevention Requirements (L1 L2 L3)
[15] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[16] Standards Mapping - OWASP Mobile 2024 M8 Security Misconfiguration
[17] Standards Mapping - OWASP Top 10 2004 A10 Insecure Configuration Management
[18] Standards Mapping - OWASP Top 10 2010 A6 Security Misconfiguration
[19] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration
[20] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration
[21] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.10
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.8
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.8
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.8
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.8
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 5.4 - Authentication and Access Control
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 5.4 - Authentication and Access Control
[31] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 5.4 - Authentication and Access Control, Control Objective C.2.3 - Web Software Access Controls
[32] Standards Mapping - SANS Top 25 2009 Risky Resource Management - CWE ID 094
[33] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3600 CAT II
[34] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3600 CAT II
[35] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3600 CAT II
[36] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3600 CAT II
[37] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3600 CAT II
[38] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3600 CAT II
[39] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3600 CAT II
[40] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-003300 CAT II
[41] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-003300 CAT II
[42] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-003300 CAT II
[43] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-003300 CAT II
[44] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-003300 CAT II
[45] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-003300 CAT II
[46] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-003300 CAT II
[47] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-003300 CAT II
[48] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-003300 CAT II
[49] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-003300 CAT II
[50] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-003300 CAT II
[51] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-003300 CAT II
[52] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-003300 CAT II
[53] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-003300 CAT II
[54] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-003300 CAT II
[55] Standards Mapping - Web Application Security Consortium Version 2.00 Application Misconfiguration (WASC-15)
desc.dataflow.python.graphql_bad_practices_introspection_enabled
Abstract
從不受信任的來源建立了 Google 遠端程序呼叫 (gRPC) Metadata 物件,這可能允許攻擊者控制關鍵通訊協定欄位。
Explanation
Metadata 類別通常用於存放 Google 遠端程序呼叫 (gRPC) 所用之基礎通訊協定的標頭資料。當基礎通訊協定是 HTTP 時,控制 Metadata 物件中的資料會使系統容易遭受 HTTP Header Manipulation 攻擊。其他攻擊途徑也是可能的,並且主要都是根據基礎通訊協定。

範例 1:以下程式碼顯示不可信賴的資料被當成 gRPC Metadata 物件的輸入使用。


...
String? evnVar = System.Environment.GetEnvironmentVariable("evnVar ");
Metadata headers = new Metadata();
headers.Add("field", evnVar);
CallOptions callOptions = new CallOptions(headers);
...
References
[1] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[2] Standards Mapping - FIPS200 SI
[3] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[4] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[5] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[6] Standards Mapping - OWASP API 2023 API3 Broken Object Property Level Authorization
[7] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[8] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[9] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[10] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[11] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[12] Standards Mapping - OWASP Top 10 2010 A1 Injection
[13] Standards Mapping - OWASP Top 10 2013 A1 Injection
[14] Standards Mapping - OWASP Top 10 2017 A1 Injection
[15] Standards Mapping - OWASP Top 10 2021 A03 Injection
[16] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[17] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[18] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[25] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[26] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[27] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[28] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[29] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[30] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[31] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
desc.dataflow.dotnet.grpc_metadata_manipulation
Abstract
從不受信任的來源建立了 Google 遠端程序呼叫 (gRPC) Metadata 物件,這可能允許攻擊者控制關鍵通訊協定欄位。
Explanation
Metadata 類別通常用於存放 Google 遠端程序呼叫 (gRPC) 所用之基礎通訊協定的標頭資料。當基礎通訊協定是 HTTP 時,控制 Metadata 物件中的資料會使系統容易遭受 HTTP Header Manipulation 攻擊。其他攻擊途徑也是可能的,並且主要都是根據基礎通訊協定。

範例 1:以下程式碼顯示使用者可控資料被當成 gRPC Metadata 物件的輸入使用。


...
String badData = getUserInput();
Metadata headers = new Metadata();
headers.put(Metadata.Key.of("sample", Metadata.ASCII_STRING_MARSHALLER), badData);
...
References
[1] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[2] Standards Mapping - FIPS200 SI
[3] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[4] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[5] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[6] Standards Mapping - OWASP API 2023 API3 Broken Object Property Level Authorization
[7] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[8] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[9] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[10] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[11] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[12] Standards Mapping - OWASP Top 10 2010 A1 Injection
[13] Standards Mapping - OWASP Top 10 2013 A1 Injection
[14] Standards Mapping - OWASP Top 10 2017 A1 Injection
[15] Standards Mapping - OWASP Top 10 2021 A03 Injection
[16] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[17] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[18] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[25] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[26] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[27] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[28] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[29] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[30] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[31] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
desc.dataflow.java.grpc_metadata_manipulation
Abstract
程式讓攻擊者可以控制用戶端應用程式執行所在的 Hadoop 叢集的核心元件。
Explanation
在以下情況會發生 Hadoop 叢集控制錯誤:

- 資料從一個不可信賴的來源進入程式。

- 資料被 Hadoop 叢集的核心元件例如 NameNodeDataNodeJobTraker 用來更改叢集的狀態。

Hadoop 叢集是不友善的環境。當未正確設定安全配置,無法防護未獲授權而存取叢集節點時,攻擊就有可能控制基礎架構。這可能造成 Hadoop 叢集提供的資料被竄改。

範例 1: 下列程式碼顯示一般用戶端應用程式中的 Job 提交,從 Hadoop 叢集主機器的指令行取其輸入資料:


public static void run(String args[]) throws IOException {

String path = "/path/to/a/file";
DFSclient client = new DFSClient(arg[1], new Configuration());
ClientProtocol nNode = client.getNameNode();

/* This sets the ownership of a file pointed by the path to a user identified
* by command line arguments.
*/
nNode.setOwner(path, args[2], args[3]);
...
}
References
[1] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[2] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[3] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[4] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[5] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[6] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[7] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[8] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[9] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[10] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[11] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[12] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[13] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[14] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[15] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[16] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[17] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[18] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[19] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[20] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[21] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[22] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[23] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[24] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[25] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[26] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[27] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[28] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[29] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[30] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[31] Standards Mapping - Web Application Security Consortium Version 2.00 Improper Input Handling (WASC-20)
desc.dataflow.java.hadoop_cluster_manipulation
Abstract
提交到 Hadoop 叢集的 Job 在不友善的環境中可能遭到竄改。
Explanation
以下情況中會發生 Hadoop 工作竄改錯誤:

- 資料從一個不可信賴的來源進入程式。

- 資料被用來指定控制用戶端工作的 JobConf 值。

Hadoop 叢集是不友善的環境。當未正確設定安全配置,無法防護未獲授權而存取叢集機器上的 HDFS 時,攻擊就有可能控制情況。這可能導致 Hadoop 叢集提供的資料遭到竄改。

範例 1: 下列程式碼顯示一般用戶端應用程式中的 Job 提交,從 Hadoop 叢集主機器的指令行取其輸入資料:


public void run(String args[]) throws IOException {

String inputDir = args[0];
String outputDir = args[1];

// Untrusted command line argument
int numOfReducers = Integer.parseInt(args[3]);
Class mapper = getClassByName(args[4]);
Class reducer = getClassByName(args[5]);

Configuration defaults = new Configuration();
JobConf job = new JobConf(defaults, OptimizedDataJoinJob.class);
job.setNumMapTasks(1);
// An attacker may set random values that exceed the range of acceptable number of reducers
job.setNumReduceTasks(numOfReducers);

return job;
}
範例 2:以下程式碼顯示的案例為攻擊者控制執行中工作,透過指令行引數使工作無法執行:


public static void main(String[] args) throws Exception {

JobID id = JobID.forName(args[0]);
JobConf conf = new JobConf(WordCount.class);
// configure this JobConf instance
...
JobClient.runJob(conf);
RunningJob job = JobClient.getJob(id);
job.killJob();

}
References
[1] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[2] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[3] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[4] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[5] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[6] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[7] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[8] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[9] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[10] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[11] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[12] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[13] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[14] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[15] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[16] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[17] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[18] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[19] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[20] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[21] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[22] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[23] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[24] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[25] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[26] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[27] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[28] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[29] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[30] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[31] Standards Mapping - Web Application Security Consortium Version 2.00 Improper Input Handling (WASC-20)
desc.dataflow.java.hadoop_job_manipulation
Abstract
Handlebars 範本中停用了逸出,這可能導致多個新漏洞。
Explanation
Handlebars 範本中執行的預設逸出,有助於保護應用程式免於攻擊者的攻擊。這可以防止跨不同類型漏洞的許多攻擊途徑。其中最顯著的保護機制是防範特定類型的 Cross-site scripting 攻擊。在此應用程式中,此保護機制遭到明確停用。

範例 1:以下範例顯示停用了 Handlebars 範本逸出。

let template = Handlebars.compile('{{foo}}', { noEscape: true })
References
[1] Standards Mapping - Common Weakness Enumeration CWE ID 554
[2] Standards Mapping - Common Weakness Enumeration Top 25 2019 [3] CWE ID 020
[3] Standards Mapping - Common Weakness Enumeration Top 25 2020 [3] CWE ID 020
[4] Standards Mapping - Common Weakness Enumeration Top 25 2021 [4] CWE ID 020
[5] Standards Mapping - Common Weakness Enumeration Top 25 2022 [4] CWE ID 020
[6] Standards Mapping - Common Weakness Enumeration Top 25 2023 [6] CWE ID 020
[7] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[8] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[9] Standards Mapping - FIPS200 CM
[10] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[11] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[12] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[13] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.1.3 Input Validation Requirements (L1 L2 L3), 5.1.4 Input Validation Requirements (L1 L2 L3), 14.1.3 Build (L2 L3)
[14] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[15] Standards Mapping - OWASP Mobile 2024 M8 Security Misconfiguration
[16] Standards Mapping - OWASP Top 10 2004 A10 Insecure Configuration Management
[17] Standards Mapping - OWASP Top 10 2010 A6 Security Misconfiguration
[18] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration
[19] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration
[20] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.10
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[28] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[29] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[31] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[32] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[33] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[53] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[54] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[55] Standards Mapping - Web Application Security Consortium Version 2.00 Improper Input Handling (WASC-20)
desc.dataflow.javascript.handlebars_misconfiguration_escaping_disabled
Abstract
Handlebars 範本中允許使用原型,會製造利用 Prototype Pollution 漏洞的機會。
Explanation
Handlebars 範本無法存取物件的原型,因為它讓應用程式容易受到 Prototype Pollution 攻擊。

當惡意使用者可以控制物件原型上的功能或屬性時,就會發生 Prototype Pollution 攻擊。控制傳遞到範本中的物件原型會導致許多漏洞,包括 Dynamic Code Evaluation、Cross-Site Scripting 和 Remote Code Execution。

範例 1:在以下設定 Handlebars 範本的範例中,依預設允許使用原型方法,以及特殊的 __defineGetter__ 函式。

let template2 = Handlebars.compile('{{foo}}')
console.log(template2({ foo: argument }, {
allowProtoMethodsByDefault: true,
allowedProtoMethods: {
__defineGetter__: true
}
}))
References
[1] Handlebars Runtime Options: Options to Control Prototype Access Handlebars
[2] Mahmoud Gamal Handlebars template injection and RCE in a Shopify app
[3] Standards Mapping - Common Weakness Enumeration CWE ID 554
[4] Standards Mapping - Common Weakness Enumeration Top 25 2019 [3] CWE ID 020
[5] Standards Mapping - Common Weakness Enumeration Top 25 2020 [3] CWE ID 020
[6] Standards Mapping - Common Weakness Enumeration Top 25 2021 [4] CWE ID 020
[7] Standards Mapping - Common Weakness Enumeration Top 25 2022 [4] CWE ID 020
[8] Standards Mapping - Common Weakness Enumeration Top 25 2023 [6] CWE ID 020
[9] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[10] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[11] Standards Mapping - FIPS200 CM
[12] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[13] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[14] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[15] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.1.3 Input Validation Requirements (L1 L2 L3), 5.1.4 Input Validation Requirements (L1 L2 L3), 14.1.3 Build (L2 L3)
[16] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[17] Standards Mapping - OWASP Mobile 2024 M8 Security Misconfiguration
[18] Standards Mapping - OWASP Top 10 2004 A10 Insecure Configuration Management
[19] Standards Mapping - OWASP Top 10 2010 A6 Security Misconfiguration
[20] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration
[21] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration
[22] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.10
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[28] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[29] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[30] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[31] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[32] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[33] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[34] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[35] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[53] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[54] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[55] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[56] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[57] Standards Mapping - Web Application Security Consortium Version 2.00 Improper Input Handling (WASC-20)
desc.structural.javascript.handlebars_misconfiguration_prototypes_allowed
Abstract
包含其他網域的 script,這表示,這個網頁的安全性依賴另一個網域的安全性。
Explanation
包含另外一個網站中可執行的內容是有風險的。這樣會導致您網站的安全性與另一個網站息息相關。

範例 1:請考慮以下 script 標籤。

<script src="http://www.example.com/js/fancyWidget.js"></script>


如果這個標籤出現在 www.example.com 以外的網站上,則該網站依賴 www.example.com 提供正確且無惡意的程式碼。如果攻擊者能危害 www.example.com,他們就能修改 fancyWidget.js 的內容來破壞網站的安全性。例如,他們可以新增程式碼至 fancyWidget.js 來竊取使用者的機密資料。
References
[1] Standards Mapping - Common Weakness Enumeration CWE ID 494, CWE ID 829
[2] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001167
[3] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[4] Standards Mapping - NIST Special Publication 800-53 Revision 4 SC-18 Mobile Code (P2)
[5] Standards Mapping - NIST Special Publication 800-53 Revision 5 SC-18 Mobile Code
[6] Standards Mapping - OWASP Application Security Verification Standard 4.0 1.14.2 Configuration Architectural Requirements (L2 L3), 5.3.9 Output Encoding and Injection Prevention Requirements (L1 L2 L3), 10.3.2 Deployed Application Integrity Controls (L1 L2 L3), 12.3.3 File Execution Requirements (L1 L2 L3), 12.3.6 File Execution Requirements (L2 L3), 14.2.3 Dependency (L1 L2 L3), 14.2.4 Dependency (L2 L3)
[7] Standards Mapping - OWASP Mobile 2014 M7 Client Side Injection
[8] Standards Mapping - OWASP Mobile 2024 M7 Insufficient Binary Protections
[9] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-PLATFORM-2
[10] Standards Mapping - SANS Top 25 2009 Risky Resource Management - CWE ID 094
[11] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-003300 CAT II
[12] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-003300 CAT II
[13] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-003300 CAT II
[14] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-003300 CAT II
[15] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-003300 CAT II
[16] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-003300 CAT II
[17] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-003300 CAT II
[18] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-003300 CAT II
[19] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-003300 CAT II
[20] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-003300 CAT II
[21] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-003300 CAT II
[22] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-003300 CAT II
[23] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-003300 CAT II
[24] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-003300 CAT II
[25] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-003300 CAT II
[26] Standards Mapping - Web Application Security Consortium Version 2.00 Insufficient Process Validation (WASC-40)
[27] Standards Mapping - Web Application Security Consortium 24 + 2 Insufficient Process Validation
desc.content.html.hardcoded_domain
Abstract
在 HTTP 回應表頭中包含未經驗證的資料會導致 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect 攻擊。
Explanation
Header Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP 回應表頭包含的資料在未經驗證的情況下,便將其傳送給網頁使用者。

如同其他軟體的安全性弱點,Header Manipulation 是達到目的的一種手段,而不是一個目的。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP 回應表頭中。

最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。如果應用程式伺服器可防止使用新行的字元來設定表頭,則您的應用程式對於 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼區段會從 HTTP 要求中讀取網路部落格項目的作者名稱 (author),並且將該名稱設定在 HTTP 回應的 Cookie 標頭中。


...
author = request->get_form_field( 'author' ).
response->set_cookie( name = 'author' value = author ).
...


假設在要求中提交了一個由標準英數字元所組成的字串,如 "Jane Smith",那麼包含這個 Cookie 的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
Set-Cookie: author=Jane Smith
...


不過,因為 cookie 的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 AUTHOR_PARAM 的值不包含任何 CR 和 LF 字元,那麼回應才會保留這種形式。若攻擊者提交惡意字串,例如「Wiley Hacker\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
Set-Cookie: author=Wiley Hacker

HTTP/1.1 200 OK
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

Cache Poisoning:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

Open Redirect: 允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚的攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.abap.header_manipulation
Abstract
在 HTTP 回應標頭中包含未經驗證的資料會引發 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect 攻擊。
Explanation
Header Manipulation 弱點會在以下情況中出現:

1.資料透過不受信任的來源進入 Web 應用程式,通常是 HTTP 要求。


2.HTTP 回應標頭包含的資料在未經驗證的情況下便傳送給 Web 使用者。

如同許多軟體的安全性弱點,Header Manipulation 是達到目的的一種手段,而不是一個目的。此弱點的基礎很簡單:攻擊者將惡意資料傳送至容易受到攻擊的應用程式,應用程式再將該資料包含於 HTTP 回應標頭中。

最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在標頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送之回應的剩餘標頭和正文,還允許它們全權建立其他回應。

現今許多新型的應用程式伺服器可防止將惡意字元插入 HTTP 標頭。例如,如果您嘗試使用禁用的字元設定標頭,最新版的 Apache Tomcat 會擲回 IllegalArgumentException。如果應用程式伺服器可防止使用換行字元來設定標頭,則您的應用程式面對 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選換行字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirect 攻擊無招架能力,所以透過使用者輸入設定 HTTP 標頭時,仍需特別注意。

範例 1:以下程式碼會設定一個名稱和值可能被攻擊者控制的 HTTP 標頭。


@HttpGet
global static void doGet() {
...
Map<String, String> params = ApexPages.currentPage().getParameters();

RestResponse res = RestContext.response;
res.addHeader(params.get('name'), params.get('value'));
...
}


假設名稱/值對由 authorJane Smith 組成,則包含此標頭的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
author:Jane Smith
...


不過,由於標頭的值是由未經驗證的使用者輸入而形成,攻擊者可能會提交惡意的名稱/值對 (例如 HTTP/1.1 200 OK\r\n...foobar),然後 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...

HTTP/1.1 200 OK
...
foo:bar


很明顯,第二個回應完全受到攻擊者所控制,而且可以使用所需的任何標頭和本文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:Cross-user Defacement、Web and Browser Cache Poisoning、Cross-site Scripting 和 Page Hijacking。

Cross-User Defacement:攻擊者可以發出一個要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解讀成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己提交惡意要求;或是在遠端情況下,攻擊者和使用者共用相同的連線到伺服器 (例如共用的 Proxy 伺服器) 的 TCP 連線。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式的行為,但會將隱私資訊 (例如帳號和密碼) 重新導向回攻擊者。

Cache Poisoning:如果將惡意建構的回應快取到多個使用者使用的網頁快取或單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如 Proxy 伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣地,如果回應快取到單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意內容,直到清除該快取項目為止,但是只有本機瀏覽器執行個體的使用者會受到影響。

Cross-Site Scripting:在攻擊者可以控制應用程式傳送的回應之後,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器所產生且原本應供使用者使用的敏感內容,轉而供攻擊者使用。攻擊者藉由提交一個要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,致使中間節點 (例如共用的 Proxy 伺服器) 錯誤地將本應傳送給使用者的伺服器產生的回應傳送給攻擊者。因為攻擊者所提出的要求產生兩個回應,因此第一個被解譯為回應攻擊者的要求,而第二個則被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者將第二個要求傳送到伺服器,Proxy 伺服器會使用伺服器針對受害者產生的要求回應伺服器,如此一來,就會危及原本針對受害者的回應標頭或本文中的敏感資訊。

Cookie Manipulation:與 Cross-Site Request Forgery 之類的攻擊結合時,攻擊者可能變更、新增合法使用者的 Cookie 或甚至覆寫合法使用者的 Cookie。

Open Redirect:允許未經驗證的輸入控制重新導向中所使用的 URL 有助於網路釣魚攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.apex.header_manipulation
Abstract
在 HTTP 回應表頭中包含未經驗證的資料會導致 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect 攻擊。
Explanation
Header Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP 回應表頭包含的資料在未經驗證的情況下,便將其傳送給網頁使用者。

如同其他軟體的安全性弱點,Header Manipulation 是達到目的的一種手段,而不是一個目的。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP 回應表頭中。

最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器與框架都可避免惡意字元插入 HTTP 表頭中。舉例來說、Microsoft .NET 框架的最新版本可將 CR、LF 與 NULL 字元在傳送至 HttpResponse.AddHeader() 方法時,將其轉換成 %0d、%0a 與 %00。如果您使用了可避免使用新行字元設定表頭的最新版.NET 框架,您的應用程式可能就可以抵擋 HTTP Response Splitting 攻擊。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼區段會從 HTTP 要求中讀取網路部落格項目的作者名稱 (author),並且將該名稱設定在 HTTP 回應的 Cookie 標頭中。


protected System.Web.UI.WebControls.TextBox Author;
...
string author = Author.Text;
Cookie cookie = new Cookie("author", author);
...


假設在要求中提交了一個由標準英數字元所組成的字串,如 "Jane Smith",那麼包含這個 Cookie 的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
Set-Cookie: author=Jane Smith
...


不過,因為 cookie 的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 Author.Text 的值不包含任何 CR 和 LF 字元,那麼回應才會保留這種形式。若攻擊者提交惡意字串,例如「Wiley Hacker\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
Set-Cookie: author=Wiley Hacker

HTTP/1.1 200 OK
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

快取破壞:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

開放式重新導向:允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.dotnet.header_manipulation
Abstract
在 HTTP 回應表頭中包含未經驗證的資料會導致 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement 或 Page Hijacking 攻擊。
Explanation
Header Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. 在未驗證包含資料的 HTTP 回應表頭是否存在惡意特徵的情況下,便將其傳送給某個網頁使用者。

如同其他軟體的安全性弱點,Header Manipulation 是達到目的的一種手段,而不是一個目的。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP 回應表頭中。

最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。如果應用程式伺服器可防止使用新行的字元來設定表頭,則您的應用程式對於 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼區段會從 HTML 表單中讀取網路部落格項目的作者名稱 (author),並且將該名稱設定在 HTTP 回應的 Cookie 標頭中。


...
EXEC CICS
WEB READ
FORMFIELD(NAME)
VALUE(AUTHOR)
...
END-EXEC.

EXEC CICS
WEB WRITE
HTTPHEADER(COOKIE)
VALUE(AUTHOR)
...
END-EXEC.
...


假設在要求中提交了一個由標準英數字元所組成的字串,如 "Jane Smith",那麼包含這個 Cookie 的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
Set-Cookie: author=Jane Smith
...


不過,因為 cookie 的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 AUTHOR 的值不包含任何 CR 和 LF 字元,那麼回應才會保留這種形式。若攻擊者提交惡意字串,例如「Wiley Hacker\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
Set-Cookie: author=Wiley Hacker

HTTP/1.1 200 OK
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

Cache Poisoning:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

Open Redirect: 允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚的攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.cobol.header_manipulation
Abstract
在 HTTP 回應表頭中包含未經驗證的資料會導致 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect 攻擊。
Explanation
Header Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是網頁要求。

2. HTTP 回應表頭包含的資料在未經驗證的情況下,便將其傳送給網頁使用者。

如同其他軟體的安全性弱點,Header Manipulation 是達到目的的一種手段,而不是一個目的。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP 回應表頭中。

最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。舉例來說,如果您嘗試使用禁用的字元設定表頭,最新版的 Apache Tomcat 會拋出 IllegalArgumentException。如果應用程式伺服器可防止使用新行的字元來設定表頭,則您的應用程式對於 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼區段會從 Web 要求中讀取網路部落格項目的作者名稱 (author),並且將該名稱設定在 HTTP 回應的 Cookie 標頭中。


<cfcookie name = "author"
value = "#Form.author#"
expires = "NOW">


假設在要求中提交了一個由標準英數字元所組成的字串,如 "Jane Smith",那麼包含這個 Cookie 的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
Set-Cookie: author=Jane Smith
...


不過,因為 cookie 的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 AUTHOR_PARAM 的值不包含任何 CR 和 LF 字元,那麼回應才會保留這種形式。若攻擊者提交惡意字串,例如「Wiley Hacker\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
Set-Cookie: author=Wiley Hacker

HTTP/1/1 200 OK
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

Cache Poisoning:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-site scripting 是最常見的攻擊形式,其攻擊在回應中包含惡意的 JavaScript 或其他程式碼,且在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

Open Redirect: 允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚的攻擊。
References
[1] Amit Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] Diabolic Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.cfml.header_manipulation
Abstract
在 HTTP 回應標頭中包含未經驗證的資料會引發 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect 攻擊。
Explanation
Header Manipulation 弱點會在以下情況中出現:

1.資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2.HTTP 回應標頭包含的資料在未經驗證的情況下便傳送給 Web 使用者。

如同許多軟體的安全性弱點,Header Manipulation 是達到目的的一種手段,而不是一個目的。此弱點的基礎很簡單:攻擊者將惡意資料傳送至容易受到攻擊的應用程式,應用程式再將該資料包含於 HTTP 回應標頭中。

最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在標頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應的剩餘標頭和本文,還允許他們建立完全在他們控制下的其他回應。

現今許多新型的應用程式伺服器可防止將惡意字元插入 HTTP 標頭。舉例來說,如果您嘗試使用禁用的字元設定標頭,最新版的 Apache Tomcat 會拋出 IllegalArgumentException。如果應用程式伺服器可防止使用換行字元來設定標頭,則您的應用程式面對 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選換行字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirect 攻擊無招架能力,所以透過使用者輸入設定 HTTP 標頭時,仍需特別注意。

範例 1:以下程式碼片段會讀取 HTTP 要求中的 'content-type',並將其設定在新 HTTP 要求的標頭中。


final server = await HttpServer.bind('localhost', 18081);
server.listen((request) async {
final headers = request.headers;
final contentType = headers.value('content-type');
final client = HttpClient();
final clientRequest = await client.getUrl(Uri.parse('https://example.com'));
clientRequest.headers.add('Content-Type', contentType as Object);
});


由於 'Content-Type' 標頭的值由未經驗證的使用者輸入所構成,因此惡意動作執行者可以操縱它來利用漏洞、執行 Code Injection 攻擊、暴露敏感資料、啟用惡意檔案執行或觸發 Denial of Service 情況,從而對應用程式的安全性和穩定性構成重大風險。
References
[1] Standards Mapping - Common Weakness Enumeration CWE ID 113
[2] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[3] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[4] Standards Mapping - FIPS200 SI
[5] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[6] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[7] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[8] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[9] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[10] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[11] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[12] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[13] Standards Mapping - OWASP Top 10 2010 A1 Injection
[14] Standards Mapping - OWASP Top 10 2013 A1 Injection
[15] Standards Mapping - OWASP Top 10 2017 A1 Injection
[16] Standards Mapping - OWASP Top 10 2021 A03 Injection
[17] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[18] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[26] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[27] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[29] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[30] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[31] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[51] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[52] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.dart.header_manipulation
Abstract
在 HTTP 回應標頭中包含未經驗證的資料會引發 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect 攻擊。
Explanation
Header Manipulation 弱點會在以下情況中出現:

1.資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2.HTTP 回應標頭包含的資料在未經驗證的情況下便傳送給 Web 使用者。

如同許多軟體的安全性弱點,Header Manipulation 是達到目的的一種手段,而不是一個目的。此弱點的基礎很簡單:攻擊者將惡意資料傳送至容易受到攻擊的應用程式,應用程式再將該資料包含於 HTTP 回應標頭中。


範例 1:以下程式碼區段會從 HTTP 要求中讀取網路部落格項目的作者名稱 (author),並且將該名稱設定在 HTTP 回應的 Cookie 標頭中。


...
author := request.FormValue("AUTHOR_PARAM")
cookie := http.Cookie{
Name: "author",
Value: author,
Domain: "www.example.com",
}
http.SetCookie(w, &cookie)
...


攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:Cross-user Defacement, Web and Browser Cache Poisoning, Cross-site Scripting 和 Page Hijacking。

Cross-User Defacement:攻擊者可以發出一個要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解讀成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己提交惡意要求;或是在遠端情況下,攻擊者和使用者共用相同的連線到伺服器 (例如共用的 Proxy 伺服器) 的 TCP 連線。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式的行為,但會將隱私資訊 (例如帳號和密碼) 重新導向回攻擊者。

Cache Poisoning:如果將惡意建構的回應快取到多個使用者使用的網頁快取或單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如 Proxy 伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣地,如果回應快取到單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意內容,直到清除該快取項目為止,但是只有本機瀏覽器實例的使用者會受到影響。

Cross-Site Scripting:在攻擊者可以控制應用程式傳送的回應之後,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器所產生且原本應供使用者使用的敏感內容,轉而供攻擊者使用。攻擊者藉由提交一個要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,致使中間節點 (例如共用的 Proxy 伺服器) 錯誤地將本應傳送給使用者的伺服器產生的回應傳送給攻擊者。因為攻擊者所提出的要求產生兩個回應,因此第一個被解譯為回應攻擊者的要求,而第二個則被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者將第二個要求傳送到伺服器,Proxy 伺服器會使用伺服器針對受害者產生的要求回應伺服器,如此一來,就會危及原本針對受害者的回應標頭或本文中的敏感資訊。

Cookie Manipulation:與 Cross-Site Request Forgery 之類的攻擊結合時,攻擊者可以變更、新增合法使用者的 Cookie 或甚至覆寫合法使用者的 Cookie。

Open Redirect:允許未經驗證的輸入控制重新導向中所使用的 URL,有助於網路釣魚攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] Standards Mapping - Common Weakness Enumeration CWE ID 113
[3] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[4] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[5] Standards Mapping - FIPS200 SI
[6] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[7] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[8] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[9] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[10] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[11] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[12] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[13] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[14] Standards Mapping - OWASP Top 10 2010 A1 Injection
[15] Standards Mapping - OWASP Top 10 2013 A1 Injection
[16] Standards Mapping - OWASP Top 10 2017 A1 Injection
[17] Standards Mapping - OWASP Top 10 2021 A03 Injection
[18] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[30] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[31] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[53] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.golang.header_manipulation
Abstract
在 HTTP 回應表頭中包含未經驗證的資料會導致 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect 攻擊。
Explanation
Header Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP 回應表頭包含的資料在未經驗證的情況下,便將其傳送給網頁使用者。

如同其他軟體的安全性弱點,Header Manipulation 是達到目的的一種手段,而不是一個目的。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP 回應表頭中。

最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。舉例來說,如果您嘗試使用禁用的字元設定表頭,最新版的 Apache Tomcat 會拋出 IllegalArgumentException。如果應用程式伺服器可防止使用新行的字元來設定表頭,則您的應用程式對於 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼區段會從 HTTP 要求中讀取網路部落格項目的作者名稱 (author),並且將該名稱設定在 HTTP 回應的 Cookie 標頭中。


String author = request.getParameter(AUTHOR_PARAM);
...
Cookie cookie = new Cookie("author", author);
cookie.setMaxAge(cookieExpiration);
response.addCookie(cookie);


假設在要求中提交了一個由標準英數字元所組成的字串,如 "Jane Smith",那麼包含這個 Cookie 的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
Set-Cookie: author=Jane Smith
...


不過,因為 cookie 的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 AUTHOR_PARAM 的值不包含任何 CR 和 LF 字元,那麼回應才會保留這種形式。若攻擊者提交惡意字串,例如「Wiley Hacker\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
Set-Cookie: author=Wiley Hacker

HTTP/1.1 200 OK
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

Cache Poisoning:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

Open Redirect: 允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚的攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.java.header_manipulation
Abstract
在 HTTP 回應表頭中包含未經驗證的資料會導致 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect 攻擊。
Explanation
Header Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP 回應表頭包含的資料在未經驗證的情況下,便將其傳送給網頁使用者。

如同其他軟體的安全性弱點,Header Manipulation 是達到目的的一種手段,而不是一個目的。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP 回應表頭中。

最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。如果應用程式伺服器可防止使用新行的字元來設定表頭,則您的應用程式對於 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼區段會從 HTTP 要求中讀取網路部落格項目的作者名稱 (author),並且將該名稱設定在 HTTP 回應的 Cookie 標頭中。


author = form.author.value;
...
document.cookie = "author=" + author + ";expires="+cookieExpiration;
...


假設在要求中提交了一個由標準英數字元所組成的字串,如 "Jane Smith",那麼包含這個 Cookie 的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
Set-Cookie: author=Jane Smith
...


不過,因為 cookie 的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 AUTHOR_PARAM 的值不包含任何 CR 和 LF 字元,那麼回應才會保留這種形式。若攻擊者提交惡意字串,例如「Wiley Hacker\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
Set-Cookie: author=Wiley Hacker

HTTP/1.1 200 OK
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:網頁與瀏覽器 Cache Poisoning、Cross-site Scripting 和 Page Hijacking。


Cache Poisoning:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

Open Redirect: 允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚的攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.javascript.header_manipulation
Abstract
在 HTTP 回應表頭中包含未經驗證的資料會導致 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect 攻擊。
Explanation
Header Manipulation 弱點會在以下情況中出現:

1.資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。


2.HTTP 回應表頭包含的資料在未經驗證的情況下,便將其傳送給網頁使用者。

如同其他軟體的安全性弱點,Header Manipulation 是達到目的的一種手段,而不是一個目的。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP 回應表頭中。

最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。舉例來說,如果您嘗試使用禁用的字元設定表頭,最新版的 Apache Tomcat 會拋出 IllegalArgumentException。如果應用程式伺服器可防止使用新行的字元來設定表頭,則您的應用程式對於 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼片段假設 namevalue 可能會被攻擊者控制。此程式碼會設定一個名稱和值可能被攻擊者控制的 HTTP 標頭。


...
NSURLSessionConfiguration * config = [[NSURLSessionConfiguration alloc] init];
NSMutableDictionary *dict = @{};
[dict setObject:value forKey:name];
[config setHTTPAdditionalHeaders:dict];
...


假設名稱/值組由 authorJane Smith 組成,則包含此標頭的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
author:Jane Smith
...


不過,由於標頭的值是由未經驗證的使用者輸入而得來,攻擊者可能會提交惡意的名稱/值組 (例如 HTTP/1.1 200 OK\r\n...foobar),然後 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...

HTTP/1.1 200 OK
...
foo:bar


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

快取破壞:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

開放式重新導向:允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.objc.header_manipulation
Abstract
在 HTTP 回應表頭中包含未經驗證的資料會導致 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect 攻擊。
Explanation
Header Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP 回應表頭包含的資料在未經驗證的情況下,便將其傳送給網頁使用者。

如同其他軟體的安全性弱點,Header Manipulation 是達到目的的一種手段,而不是一個目的。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP 回應表頭中。

最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。舉例而言,最新版的 PHP 在新行傳送 header() 至函數時,將會產生警告並停止建立表頭。如果您的 PHP 版本無法使用新行字元設定表頭,您的應用程式可能就可以抵擋 HTTP Response Splitting 攻擊。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼片段會讀取 HTTP 要求中的位置,並在 HTTP 回應的表頭位置欄位中設定該位置。


<?php
$location = $_GET['some_location'];
...
header("location: $location");
?>


假設在要求中提交了一個由標準英數字元所組成的字串,如「index.html」,那麼包含這個 Cookie 的 HTTP 回應可能會以下列形式表示:


HTTP/1.1 200 OK
...
location: index.html
...


不過,因為位置的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 some_location 的值不包含任何 CR 和 LF 字元,那麼回應才會保留這種形式。若攻擊者提交惡意字串,例如「index.html\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
location: index.html

HTTP/1.1 200 OK
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

Cache Poisoning:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

Open Redirect: 允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚的攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.php.header_manipulation
Abstract
在 HTTP 回應表頭中包含未經驗證的資料會導致 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect 攻擊。
Explanation
Header Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP 回應表頭包含的資料在未經驗證的情況下,便將其傳送給網頁使用者。

如同其他軟體的安全性弱點,Header Manipulation 是達到目的的一種手段,而不是一個目的。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP 回應表頭中。

最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。如果應用程式伺服器可防止使用新行的字元來設定表頭,則您的應用程式對於 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼區段會從 HTTP 要求中讀取網路部落格項目的作者名稱 (author),並且將該名稱設定在 HTTP 回應的 Cookie 標頭中。


...
-- Assume QUERY_STRING looks like AUTHOR_PARAM=Name
author := SUBSTR(OWA_UTIL.get_cgi_env('QUERY_STRING'), 14);
OWA_UTIL.mime_header('text/html', false);
OWA_COOKE.send('author', author);
OWA_UTIL.http_header_close;
...


假設在要求中提交了一個由標準英數字元所組成的字串,如 "Jane Smith",那麼包含這個 Cookie 的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
Set-Cookie: author=Jane Smith
...


不過,因為 cookie 的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 AUTHOR_PARAM 的值不包含任何 CR 和 LF 字元,那麼回應才會保留這種形式。若攻擊者提交惡意字串,例如「Wiley Hacker\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
Set-Cookie: author=Wiley Hacker

HTTP/1.1 200 OK
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

快取破壞:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

開放式重新導向:允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.sql.header_manipulation
Abstract
在 HTTP 回應表頭中包含未經驗證的資料會導致 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect 攻擊。
Explanation
Header Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP 回應表頭包含的資料在未經驗證的情況下,便將其傳送給網頁使用者。

如同其他軟體的安全性弱點,Header Manipulation 是達到目的的一種手段,而不是一個目的。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP 回應表頭中。

最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。如果應用程式伺服器可防止使用新行的字元來設定表頭,則您的應用程式對於 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼片段會讀取 HTTP 要求中的位置,並在 HTTP 回應的位置欄位表頭中設定該位置。


location = req.field('some_location')
...
response.addHeader("location",location)


假設在要求中提交了一個由標準英數字元所組成的字串,如「index.html」,那麼包含這個 Cookie 的 HTTP 回應可能會以下列形式表示:


HTTP/1.1 200 OK
...
location: index.html
...


不過,因為位置的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 some_location 的值不包含任何 CR 和 LF 字元,那麼回應才會保留這種形式。若攻擊者提交惡意字串,例如「index.html\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
location: index.html

HTTP/1.1 200 OK
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

Cache Poisoning:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

Open Redirect: 允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚的攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.python.header_manipulation
Abstract
在 HTTP 回應表頭中包含未經驗證的資料會導致 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect 攻擊。
Explanation
Header Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP 回應表頭包含的資料在未經驗證的情況下,便將其傳送給網頁使用者。

如同其他軟體的安全性弱點,Header Manipulation 是達到目的的一種手段,而不是一個目的。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP 回應表頭中。

最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。舉例來說,如果您嘗試使用禁用的字元設定表頭,最新版的 Apache Tomcat 會拋出 IllegalArgumentException。如果應用程式伺服器可防止使用新行的字元來設定表頭,則您的應用程式對於 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼區段會從 HTTP 要求中讀取網路部落格項目的作者名稱 (author),並且將此名稱用於網站其他部分的 get 要求中。


author = req.params[AUTHOR_PARAM]
http = Net::HTTP.new(URI("http://www.mysite.com"))
http.post('/index.php', "author=#{author}")


假設在要求中提交了一個由標準英數字元所組成的字串,如「Jane Smith」,那麼 HTTP 回應可能會表現為以下形式:


POST /index.php HTTP/1.1
Host: www.mysite.com
author=Jane Smith
...


不過,因為 URL 的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 AUTHOR_PARAM 的值不包含任何 CR 和 LF 字元時,回應才會保留這種形式。若攻擊者提交惡意字串,例如「Wiley Hacker\r\nPOST /index.php HTTP/1.1\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


POST /index.php HTTP/1.1
Host: www.mysite.com
author=Wiley Hacker

POST /index.php HTTP/1.1
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

Cache Poisoning:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

Open Redirect: 允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚的攻擊。
References
[1] Standards Mapping - Common Weakness Enumeration CWE ID 113
[2] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[3] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[4] Standards Mapping - FIPS200 SI
[5] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[6] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[7] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[8] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[9] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[10] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[11] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[12] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[13] Standards Mapping - OWASP Top 10 2010 A1 Injection
[14] Standards Mapping - OWASP Top 10 2013 A1 Injection
[15] Standards Mapping - OWASP Top 10 2017 A1 Injection
[16] Standards Mapping - OWASP Top 10 2021 A03 Injection
[17] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[18] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[26] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[27] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[29] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[30] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[31] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[51] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[52] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.ruby.header_manipulation
Abstract
在 HTTP 回應標頭中包含未經驗證的資料會引發 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect 攻擊。
Explanation
Header Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP 回應標頭包含的資料在未經驗證的情況下便傳送給 Web 使用者。

如同許多軟體的安全性弱點,Header Manipulation 是達到目的的一種手段,而不是一個目的。 此弱點的基礎很簡單:攻擊者將惡意資料傳送至容易受到攻擊的應用程式,應用程式再將該資料包含於 HTTP 回應標頭中。

最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。 為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在標頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。 這些字元不僅讓攻擊者控制應用程式接下來要傳送之回應的剩餘標頭和正文,還允許它們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 標頭。 舉例來說,如果您嘗試使用禁用的字元設定標頭,Play Framework 會拋出一個異常。 如果應用程式伺服器可防止使用換行字元來設定標頭,則您的應用程式面對 HTTP Response Splitting 的攻擊,具有一定的防禦能力。 但是,僅篩選換行字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirect 攻擊無招架能力,所以透過使用者輸入設定 HTTP 標頭時,仍需特別注意。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.scala.header_manipulation
Abstract
在 HTTP 回應表頭中包含未經驗證的資料會導致 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect 攻擊。
Explanation
Header Manipulation 弱點會在以下情況中出現:

1.資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。


2.HTTP 回應表頭包含的資料在未經驗證的情況下,便將其傳送給網頁使用者。

如同其他軟體的安全性弱點,Header Manipulation 是達到目的的一種手段,而不是一個目的。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP 回應表頭中。

最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。舉例來說,如果您嘗試使用禁用的字元設定表頭,最新版的 Apache Tomcat 會拋出 IllegalArgumentException。如果應用程式伺服器可防止使用新行的字元來設定表頭,則您的應用程式對於 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼片段假設 namevalue 可能會被攻擊者控制。此程式碼會設定一個名稱和值可能被攻擊者控制的 HTTP 標頭。


...
var headers = []
headers[name] = value
let config = NSURLSessionConfiguration.backgroundSessionConfigurationWithIdentifier("com.acme")
config.HTTPAdditionalHeaders = headers
...


假設名稱/值組由 authorJane Smith 組成,則包含此標頭的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
author:Jane Smith
...


不過,由於標頭的值是由未經驗證的使用者輸入而得來,攻擊者可能會提交惡意的名稱/值組 (例如 HTTP/1.1 200 OK\r\n...foobar),然後 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...

HTTP/1.1 200 OK
...
foo:bar


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

快取破壞:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

開放式重新導向:允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.swift.header_manipulation
Abstract
在 HTTP 回應表頭中包含未經驗證的資料會導致 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect 攻擊。
Explanation
Header Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP 回應表頭包含的資料在未經驗證的情況下,便將其傳送給網頁使用者。

如同其他軟體的安全性弱點,Header Manipulation 是達到目的的一種手段,而不是一個目的。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP 回應表頭中。

最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器與框架都可避免惡意字元插入 HTTP 表頭中,但是支援典型 ASP 的伺服器通常沒有這項保護機制。

範例 1:以下程式碼區段會從 HTTP 要求中讀取網路部落格項目的作者名稱 (author),並且將該名稱設定在 HTTP 回應的 Cookie 標頭中。


...
author = Request.Form(AUTHOR_PARAM)
Response.Cookies("author") = author
Response.Cookies("author").Expires = cookieExpiration
...


假設在要求中提交了一個由標準英數字元所組成的字串,如 "Jane Smith",那麼包含這個 Cookie 的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
Set-Cookie: author=Jane Smith
...


不過,因為 cookie 的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 AUTHOR_PARAM 的值不包含任何 CR 和 LF 字元,那麼回應才會保留這種形式。若攻擊者提交惡意字串,例如「Wiley Hacker\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
Set-Cookie: author=Wiley Hacker

HTTP/1.1 200 OK
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

快取破壞:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

開放式重新導向:允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.vb.header_manipulation
Abstract
在 Cookie 中包含未經驗證的資料會導致 HTTP 回應 Header manipulation,並引發 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect。
Explanation
Cookie Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP Cookie 包含的資料在未經驗證的情況下,便傳送給網頁使用者。

與許多軟體的安全性弱點一樣,Cookie manipulation 是達到目的的一種手段,而不是目的本身。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP Cookie 中。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

由於 HTTP 回應表頭,Cookie manipulation 攻擊還會導致其他類型的攻擊,例如:

HTTP Response Splitting:
最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。舉例來說,如果您嘗試使用禁用的字元設定表頭,最新版的 Apache Tomcat 會拋出 IllegalArgumentException。如果應用程式伺服器可防止使用新行的字元來設定表頭,則您的應用程式對於 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼區段會從 HTTP 要求中讀取網路部落格項目的作者名稱 (author),並且將該名稱設定在 HTTP 回應的 Cookie 標頭中。


...
author = request->get_form_field( 'author' ).
response->set_cookie( name = 'author' value = author ).
...


假設在要求中提交了一個由標準英數字元所組成的字串,如 "Jane Smith",那麼包含這個 Cookie 的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
Set-Cookie: author=Jane Smith
...


不過,因為 cookie 的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 AUTHOR_PARAM 的值不包含任何 CR 和 LF 字元,那麼回應才會保留這種形式。若攻擊者提交惡意字串,例如「Wiley Hacker\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
Set-Cookie: author=Wiley Hacker

HTTP/1.1 200 OK
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

Cache Poisoning:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Open Redirect: 允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚的攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.1 - Web Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.abap.header_manipulation_cookies
Abstract
在 Cookie 中包含未經驗證的資料會導致 HTTP Response Header Manipulation,並引發 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect。
Explanation
Cookie Manipulation 弱點會在以下情況中出現:

1.資料透過不受信任的來源進入 Web 應用程式,通常是 HTTP 要求。



2.HTTP Cookie 包含的資料在未經驗證的情況下,便傳送給 Web 使用者。



與許多軟體的安全性弱點一樣,Cookie Manipulation 是達到目的的一種手段,而不是目的本身。此弱點的基礎很簡單:攻擊者將惡意資料傳送至容易受到攻擊的應用程式,應用程式再將該資料包含於 HTTP Cookie 中。

Cookie Manipulation:與 Cross-Site Request Forgery 之類的攻擊結合時,攻擊者可能變更、新增合法使用者的 Cookie 或甚至覆寫合法使用者的 Cookie。

由於 HTTP 回應標頭的緣故,Cookie Manipulation 攻擊還可能導致其他類型的攻擊,例如:

HTTP Response Splitting:
最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在標頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應的剩餘標頭和本文,還允許他們建立完全在他們控制下的其他回應。

現今許多新型的應用程式伺服器可防止將惡意字元插入 HTTP 標頭。例如,如果您嘗試使用禁用的字元設定標頭,最新版的 Apache Tomcat 會擲回 IllegalArgumentException。如果應用程式伺服器可防止使用換行字元來設定標頭,則您的應用程式面對 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選換行字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirect 攻擊無招架能力,所以透過使用者輸入設定 HTTP 標頭時,仍需特別注意。

範例 1:以下程式碼區段會從 HTTP 要求中讀取部落格項目的作者名稱 (author),並且將該名稱設定在 HTTP 回應的 Cookie 標頭中。


...
Cookie cookie = new Cookie('author', author, '/', -1, false);
ApexPages.currentPage().setCookies(new Cookie[] {cookie});
...


假設在要求中提交了一個由標準英數字元所組成的字串,例如「Jane Smith」,則包含這個 Cookie 的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
Set-Cookie: author=Jane Smith
...


不過,因為 Cookie 的值是由未經驗證的使用者輸入而形成,所以只有當傳送給 author 的值不包含任何 CR 和 LF 字元時,回應才會保留這種形式。若攻擊者提交惡意字串,例如「Wiley Hacker\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
Set-Cookie: author=Wiley Hacker

HTTP/1.1 200 OK
...


很明顯,第二個回應完全受到攻擊者所控制,而且可以使用所需的任何標頭和本文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:Cross-user Defacement、Web and Browser Cache Poisoning、Cross-site Scripting 和 Page Hijacking。

Cross-User Defacement:攻擊者可以發出一個要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解讀成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己提交惡意要求;或是在遠端情況下,攻擊者和使用者共用相同的連線到伺服器 (例如共用的 Proxy 伺服器) 的 TCP 連線。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式的行為,但會將隱私資訊 (例如帳戶和密碼) 重新導向回攻擊者。

Cache Poisoning:如果將惡意建構的回應快取到多個使用者使用的網頁快取或單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如 Proxy 伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣地,如果回應快取到單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意內容,直到清除該快取項目為止,但是只有本機瀏覽器執行個體的使用者會受到影響。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器所產生且原本應供使用者使用的敏感內容,轉而供攻擊者使用。攻擊者藉由提交一個要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,致使中間節點 (例如共用的 Proxy 伺服器) 錯誤地將本應傳送給使用者的伺服器產生的回應傳送給攻擊者。因為攻擊者所提出的要求產生兩個回應,因此第一個被解譯為回應攻擊者的要求,而第二個則被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者將第二個要求傳送到伺服器,Proxy 伺服器會使用伺服器針對受害者產生的要求回應伺服器,如此一來,就會危及原本針對受害者的回應標頭或本文中的敏感資訊。

Open Redirect:允許未經驗證的輸入控制重新導向中所使用的 URL 有助於網路釣魚攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.1 - Web Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.apex.header_manipulation_cookies
Abstract
在 Cookie 中包含未經驗證的資料會導致 HTTP 回應 Header manipulation,並引發 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect。
Explanation
Cookie Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP Cookie 包含的資料在未經驗證的情況下,便傳送給網頁使用者。

與許多軟體的安全性弱點一樣,Cookie manipulation 是達到目的的一種手段,而不是目的本身。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP Cookie 中。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

由於 HTTP 回應表頭,Cookie manipulation 攻擊還會導致其他類型的攻擊,例如:

HTTP Response Splitting:
最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。舉例來說,如果您嘗試使用禁用的字元設定表頭,最新版的 Apache Tomcat 會拋出 IllegalArgumentException。如果應用程式伺服器可防止使用新行的字元來設定表頭,則您的應用程式對於 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼區段會從 HTTP 要求中讀取網路部落格項目的作者名稱 (author),並且將該名稱設定在 HTTP 回應的 Cookie 標頭中。


protected System.Web.UI.WebControls.TextBox Author;
...
string author = Author.Text;
Cookie cookie = new Cookie("author", author);
...


假設在要求中提交了一個由標準英數字元所組成的字串,如 "Jane Smith",那麼包含這個 Cookie 的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
Set-Cookie: author=Jane Smith
...


不過,因為 cookie 的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 AUTHOR_PARAM 的值不包含任何 CR 和 LF 字元,那麼回應才會保留這種形式。若攻擊者提交惡意字串,例如「Wiley Hacker\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
Set-Cookie: author=Wiley Hacker

HTTP/1.1 200 OK
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

快取破壞:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

開放式重新導向:允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.1 - Web Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.dotnet.header_manipulation_cookies
Abstract
在 Cookie 中包含未經驗證的資料會導致 HTTP 回應 Header manipulation,並引發 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect。
Explanation
Cookie Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP Cookie 包含的資料在未經驗證的情況下,便傳送給網頁使用者。

與許多軟體的安全性弱點一樣,Cookie manipulation 是達到目的的一種手段,而不是目的本身。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP Cookie 中。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

由於 HTTP 回應表頭,Cookie manipulation 攻擊還會導致其他類型的攻擊,例如:

HTTP Response Splitting:
最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。舉例來說,如果您嘗試使用禁用的字元設定表頭,最新版的 Apache Tomcat 會拋出 IllegalArgumentException。如果應用程式伺服器可防止使用新行的字元來設定表頭,則您的應用程式對於 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼區段會從 HTTP 要求中讀取網路部落格項目的作者名稱 (author),並且將該名稱設定在 HTTP 回應的 Cookie 標頭中。


<cfcookie name = "author"
value = "#Form.author#"
expires = "NOW">


假設在要求中提交了一個由標準英數字元所組成的字串,如 "Jane Smith",那麼包含這個 Cookie 的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
Set-Cookie: author=Jane Smith
...


不過,因為 cookie 的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 AUTHOR_PARAM 的值不包含任何 CR 和 LF 字元,那麼回應才會保留這種形式。若攻擊者提交惡意字串,例如「Wiley Hacker\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
Set-Cookie: author=Wiley Hacker

HTTP/1.1 200 OK
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

Cache Poisoning:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Open Redirect: 允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚的攻擊。
References
[1] Amit Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] Diabolic Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.1 - Web Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.cfml.header_manipulation_cookies
Abstract
在 Cookie 中包含未經驗證的資料會導致 HTTP Response Header Manipulation,並引發 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect。
Explanation
Cookie Manipulation 弱點會在以下情況中出現:

1.資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2.HTTP Cookie 包含的資料在未經驗證的情況下,便傳送給 Web 使用者。

與許多軟體的安全性弱點一樣,Cookie Manipulation 是達到目的的一種手段,而不是目的本身。此弱點的基礎很簡單:攻擊者將惡意資料傳送至容易受到攻擊的應用程式,應用程式再將該資料包含於 HTTP Cookie 中。

Cookie Manipulation:與 Cross-Site Request Forgery 之類的攻擊結合時,攻擊者可以變更、新增合法使用者的 Cookie 或甚至覆寫合法使用者的 Cookie。

由於 HTTP 回應標頭的緣故,Cookie Manipulation 攻擊還可能導致其他類型的攻擊,例如:

HTTP Response Splitting:
最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在標頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送之回應的剩餘標頭和正文,還允許它們全權建立其他回應。

現今許多新型的應用程式伺服器可防止將惡意字元插入 HTTP 標頭。舉例來說,如果您嘗試使用禁用的字元設定標頭,最新版的 Apache Tomcat 會拋出 IllegalArgumentException。如果應用程式伺服器可防止使用換行字元來設定標頭,則您的應用程式面對 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選換行字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirect 攻擊無招架能力,所以透過使用者輸入設定 HTTP 標頭時,仍需特別注意。

範例 1:以下程式碼區段會從 HTTP 要求中讀取網路部落格項目的作者名稱 (author),並且將該名稱設定在 HTTP 回應的 Cookie 標頭中。


...
author := request.FormValue("AUTHOR_PARAM")
cookie := http.Cookie{
Name: "author",
Value: author,
Domain: "www.example.com",
}
http.SetCookie(w, &cookie)
...


假設在要求中提交了一個由標準英數字元所組成的字串,如 "Jane Smith",那麼包含這個 Cookie 的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
Set-Cookie: author=Jane Smith
...


不過,因為 Cookie 的值是由未經驗證的使用者輸入而得來,所以只有當提交給 AUTHOR_PARAM 的值不包含任何 CR 和 LF 字元時,回應才會保留這種形式。若攻擊者提交惡意字串,例如 "Wiley Hacker\r\nHTTP/1.1 200 OK\r\n...",則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
Set-Cookie: author=Wiley Hacker

HTTP/1.1 200 OK
...


很明顯,第二個回應完全受到攻擊者所控制,而且可以使用所需的任何標頭和正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

Cross-User Defacement:攻擊者可以發出一個要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解讀成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己提交惡意要求;或是在遠端情況下,攻擊者和使用者共用相同的連線到伺服器 (例如共用的 Proxy 伺服器) 的 TCP 連線。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式的行為,但會將隱私資訊 (例如帳號和密碼) 重新導向回攻擊者。

Cache Poisoning:如果將惡意建構的回應快取到多個使用者使用的網頁快取或單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如 Proxy 伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣地,如果回應快取到單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意內容,直到清除該快取項目為止,但是只有本機瀏覽器實例的使用者會受到影響。

Cross-Site Scripting:在攻擊者控制應用程式傳送的回應之後,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,攻擊者還可以利用具有相同本質的弱點,重新導向伺服器所產生且原本供使用者使用的敏感內容,轉而供攻擊者使用。攻擊者藉由提交一個要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,致使中間節點 (例如共用的 Proxy 服務器) 錯誤地將本應傳送給使用者的伺服器產生的回應傳送給攻擊者。因為攻擊者所提出的要求產生兩個回應,因此第一個被解譯為回應攻擊者的要求,而第二個則被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者將第二個要求傳送到伺服器,Proxy 伺服器會使用伺服器針對受害者產生的要求回應伺服器,如此一來,就會危及原本針對受害者的回應標頭或本文中的敏感資訊。

Open Redirect:允許未經驗證的輸入控制重新導向中所使用的 URL,有助於網路釣魚攻擊。
References
[1] Standards Mapping - Common Weakness Enumeration CWE ID 113
[2] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[3] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[4] Standards Mapping - FIPS200 SI
[5] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[6] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[7] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[8] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[9] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[10] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[11] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[12] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[13] Standards Mapping - OWASP Top 10 2010 A1 Injection
[14] Standards Mapping - OWASP Top 10 2013 A1 Injection
[15] Standards Mapping - OWASP Top 10 2017 A1 Injection
[16] Standards Mapping - OWASP Top 10 2021 A03 Injection
[17] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[18] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[26] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[27] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.1 - Web Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[29] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[30] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[31] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[51] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[52] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.golang.header_manipulation_cookies
Abstract
在 Cookie 中包含未經驗證的資料會導致 HTTP 回應 Header manipulation,並引發 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect。
Explanation
Cookie Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP Cookie 包含的資料在未經驗證的情況下,便傳送給網頁使用者。

與許多軟體的安全性弱點一樣,Cookie manipulation 是達到目的的一種手段,而不是目的本身。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP Cookie 中。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

由於 HTTP 回應表頭,Cookie manipulation 攻擊還會導致其他類型的攻擊,例如:

HTTP Response Splitting:
最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。舉例來說,如果您嘗試使用禁用的字元設定表頭,最新版的 Apache Tomcat 會拋出 IllegalArgumentException。如果應用程式伺服器可防止使用新行的字元來設定表頭,則您的應用程式對於 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼區段會從 HTTP 要求中讀取網路部落格項目的作者名稱 (author),並且將該名稱設定在 HTTP 回應的 Cookie 表頭中。


String author = request.getParameter(AUTHOR_PARAM);
...
Cookie cookie = new Cookie("author", author);
cookie.setMaxAge(cookieExpiration);
response.addCookie(cookie);


假設在要求中提交了一個由標準英數字元所組成的字串,如 "Jane Smith",那麼包含這個 Cookie 的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
Set-Cookie: author=Jane Smith
...


不過,因為 cookie 的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 AUTHOR_PARAM 的值不包含任何 CR 和 LF 字元,那麼回應才會保留這種形式。若攻擊者提交惡意字串,例如「Wiley Hacker\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
Set-Cookie: author=Wiley Hacker

HTTP/1.1 200 OK
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

有人認為在行動環境中,典型的 Web 應用程式弱點 (例如 Header Manipulation 與 Cookie Manipulation) 不會產生影響,因為使用者為何會攻擊自己呢?但是請謹記,行動平台的本質是從多種來源下載,並在相同裝置上一起執行的應用程式。在金融應用程式旁執行惡意程式碼的可能性很高,這必然會擴大行動應用程式的受攻擊面,將程序之間的通訊包括在內。

範例 2:以下程式碼改寫 Example 1 以適用於 Android 平台。


...
CookieManager webCookieManager = CookieManager.getInstance();
String author = this.getIntent().getExtras().getString(AUTHOR_PARAM);
String setCookie = "author=" + author + "; max-age=" + cookieExpiration;
webCookieManager.setCookie(url, setCookie);

...
跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

Cache Poisoning:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Open Redirect: 允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚的攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.1 - Web Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.java.header_manipulation_cookies
Abstract
在 Cookie 中包含未經驗證的資料會導致 HTTP 回應 Header manipulation,並引發 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect。
Explanation
Cookie Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP Cookie 包含的資料在未經驗證的情況下,便傳送給網頁使用者。

與許多軟體的安全性弱點一樣,Cookie manipulation 是達到目的的一種手段,而不是目的本身。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP Cookie 中。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

由於 HTTP 回應表頭,Cookie manipulation 攻擊還會導致其他類型的攻擊,例如:

HTTP Response Splitting:
最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。舉例來說,如果您嘗試使用禁用的字元設定表頭,最新版的 Apache Tomcat 會拋出 IllegalArgumentException。如果應用程式伺服器可防止使用新行的字元來設定表頭,則您的應用程式對於 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼區段會從 HTTP 要求中讀取網路部落格項目的作者名稱 (author),並且將該名稱設定在 HTTP 回應的 Cookie 標頭中。


author = form.author.value;
...
document.cookie = "author=" + author + ";expires="+cookieExpiration;
...


假設在要求中提交了一個由標準英數字元所組成的字串,如 "Jane Smith",那麼包含這個 Cookie 的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
Set-Cookie: author=Jane Smith
...


不過,因為 cookie 的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 AUTHOR_PARAM 的值不包含任何 CR 和 LF 字元,那麼回應才會保留這種形式。若攻擊者提交惡意字串,例如「Wiley Hacker\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
Set-Cookie: author=Wiley Hacker

HTTP/1.1 200 OK
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

Cross-User Defacement:攻擊者可以發出一個要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解讀成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己提交惡意要求;或是在遠端情況下,攻擊者和使用者共用相同的連線到伺服器 (例如共用的 Proxy 伺服器) 的 TCP 連線。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式的行為,但會將隱私資訊 (例如帳戶和密碼) 重新導向回攻擊者。

Cache Poisoning:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Open Redirect: 允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚的攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.1 - Web Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.javascript.header_manipulation_cookies
Abstract
在 Cookie 中包含未經驗證的資料會導致 HTTP 回應 Header manipulation,並引發 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect。
Explanation
Cookie Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP Cookie 包含的資料在未經驗證的情況下,便傳送給網頁使用者。

與許多軟體的安全性弱點一樣,Cookie manipulation 是達到目的的一種手段,而不是目的本身。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP Cookie 中。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

由於 HTTP 回應表頭,Cookie manipulation 攻擊還會導致其他類型的攻擊,例如:

HTTP Response Splitting:
最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。舉例來說,如果您嘗試使用禁用的字元設定表頭,最新版的 Apache Tomcat 會拋出 IllegalArgumentException。如果應用程式伺服器可防止使用新行的字元來設定表頭,則您的應用程式對於 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼區段會從 HTTP 要求中讀取網路部落格項目的作者名稱 (author),並且將該名稱設定在 HTTP 回應的 Cookie 標頭中。


<?php
$author = $_GET['AUTHOR_PARAM'];
...
header("author: $author");
?>


假設在要求中提交了一個由標準英數字元所組成的字串,如 "Jane Smith",那麼包含這個 Cookie 的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
Set-Cookie: author=Jane Smith
...


不過,因為 cookie 的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 AUTHOR_PARAM 的值不包含任何 CR 和 LF 字元,那麼回應才會保留這種形式。若攻擊者提交惡意字串,例如「Wiley Hacker\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
Set-Cookie: author=Wiley Hacker

HTTP/1.1 200 OK
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

Cache Poisoning:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Open Redirect: 允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚的攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.1 - Web Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.php.header_manipulation_cookies
Abstract
在 HTTP 回應表頭中包含未經驗證的資料會導致 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect 攻擊。
Explanation
Header Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP 回應表頭包含的資料在未經驗證的情況下,便將其傳送給網頁使用者。

如同其他軟體的安全性弱點,Header Manipulation 是達到目的的一種手段,而不是一個目的。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP 回應表頭中。

最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。如果應用程式伺服器可防止使用新行的字元來設定表頭,則您的應用程式對於 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼片段會讀取 HTTP 要求中的位置,並在 HTTP 回應的位置欄位表頭中設定該位置。


location = req.field('some_location')
...
response.addHeader("location",location)


假設在要求中提交了一個由標準英數字元所組成的字串,如「index.html」,那麼包含這個 Cookie 的 HTTP 回應可能會以下列形式表示:


HTTP/1.1 200 OK
...
location: index.html
...


不過,因為位置的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 some_location 的值不包含任何 CR 和 LF 字元,那麼回應才會保留這種形式。若攻擊者提交惡意字串,例如「index.html\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
location: index.html

HTTP/1.1 200 OK
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

Cache Poisoning:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

Open Redirect: 允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚的攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.1 - Web Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.python.header_manipulation
Abstract
在 Cookie 中包含未經驗證的資料會導致 HTTP Response Header Manipulation,並引發 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect。
Explanation
Cookie Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP Cookie 包含的資料在未經驗證的情況下,便傳送給 Web 使用者。

與許多軟體的安全性弱點一樣,Cookie Manipulation 是達到目的的一種手段,而不是目的本身。 此弱點的基礎很簡單:攻擊者將惡意資料傳送至容易受到攻擊的應用程式,應用程式再將該資料包含於 HTTP Cookie 中。

Cookie Manipulation: 與 Cross-Site Request Forgery 之類的攻擊結合時,攻擊者可以變更、新增至合法的使用者 Cookie,甚至覆寫合法使用者的 Cookie。

作為 HTTP 回應標頭,Cookie Manipulation 攻擊還會引發其他類型的攻擊,例如:

HTTP Response Splitting:
最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。 為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在標頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。 這些字元不僅讓攻擊者控制應用程式接下來要傳送之回應的剩餘標頭和正文,還允許它們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 標頭。 舉例來說,如果您嘗試使用禁用的字元設定標頭,最新版的 Apache Tomcat 會拋出 IllegalArgumentException。 如果應用程式伺服器可防止使用換行字元來設定標頭,則您的應用程式面對 HTTP Response Splitting 的攻擊,具有一定的防禦能力。 但是,僅篩選換行字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirect 攻擊無招架能力,所以透過使用者輸入設定 HTTP 標頭時,仍需特別注意。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.1 - Web Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.scala.header_manipulation_cookies
Abstract
在 Cookie 中包含未經驗證的資料會導致 HTTP 回應 Header manipulation,並引發 Cache-Poisoning、Cross-Site Scripting、Cross-User Defacement、Page Hijacking、Cookie Manipulation 或 Open Redirect。
Explanation
Cookie Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入 Web 應用程式,通常是 HTTP 要求。

2. HTTP Cookie 包含的資料在未經驗證的情況下,便傳送給網頁使用者。

與許多軟體的安全性弱點一樣,Cookie manipulation 是達到目的的一種手段,而不是目的本身。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 HTTP Cookie 中。

Cookie Manipulation:與跨網站偽造要求之類的攻擊結合時,攻擊者可能變更、新增至合法使用者的 Cookie,甚至覆寫合法使用者的 Cookie。

由於 HTTP 回應表頭,Cookie manipulation 攻擊還會導致其他類型的攻擊,例如:

HTTP Response Splitting:
最常見的一種 Header Manipulation 攻擊為 HTTP Response Splitting。為了成功進行 HTTP Response Splitting 攻擊,應用程式必須允許輸入在表頭中包含 CR (Carriage Return,亦由 %0d 或 \r 指定) 與 LF (Line Feed,亦由 %0a 或 \n 指定) 字元。這些字元不僅讓攻擊者控制應用程式接下來要傳送的回應表頭和回應主題,還允許他們全權建立其他回應。

現今許多先進的應用程式伺服器可防止將惡意字元插入 HTTP 表頭。舉例來說,如果您嘗試使用禁用的字元設定表頭,最新版的 Apache Tomcat 會拋出 IllegalArgumentException。如果應用程式伺服器可防止使用新行的字元來設定表頭,則您的應用程式對於 HTTP Response Splitting 的攻擊,具有一定的防禦能力。但是,僅篩選新行的字元,應用程式可能仍對 Cookie Manipulation 或 Open Redirects 攻擊無招架能力,所以透過使用者輸入設定 HTTP 表頭時,仍需特別注意。

範例 1:以下程式碼區段會從 HTTP 要求中讀取網路部落格項目的作者名稱 (author),並且將該名稱設定在 HTTP 回應的 Cookie 標頭中。


...
author = Request.Form(AUTHOR_PARAM)
Response.Cookies("author") = author
Response.Cookies("author").Expires = cookieExpiration
...


假設在要求中提交了一個由標準英數字元所組成的字串,如 "Jane Smith",那麼包含這個 Cookie 的 HTTP 回應可能會採用以下形式:


HTTP/1.1 200 OK
...
Set-Cookie: author=Jane Smith
...


不過,因為 cookie 的值是由未經驗證的使用者輸入而得來,所以只有當傳送給 AUTHOR_PARAM 的值不包含任何 CR 和 LF 字元,那麼回應才會保留這種形式。若攻擊者提交惡意字串,例如「Wiley Hacker\r\nHTTP/1.1 200 OK\r\n...」,則 HTTP 回應將分割為以下形式的兩種回應:


HTTP/1.1 200 OK
...
Set-Cookie: author=Wiley Hacker

HTTP/1.1 200 OK
...


很明顯的,第二個回應完全被攻擊者所控制,並且能使用任何標頭和想要的正文內容來建構。攻擊者可以建構任何 HTTP 回應,並造成不同的攻擊結果,這些攻擊包括:跨用戶塗改、網頁和瀏覽器快取記憶體下毒、Cross-site scripting 和網頁劫持。

跨用戶塗改:攻擊者將能夠發出單一要求到易受攻擊的伺服器,讓伺服器建立兩個回應,其中第二個回應可能會被錯誤解譯成針對不同要求的回應,該要求可能是由另一個與伺服器共用相同 TCP 連線的使用者所發出的。這種攻擊可以下列方式達成:攻擊者誘導使用者自己傳遞惡意要求,或是在遠端情況下,攻擊者和使用者共用相同的 TCP 連線連接到伺服器 (例如共用的代理伺服器)。最理想的情況是,攻擊者可能利用此功能讓使用者確信他們的應用程式已受攻擊,造成使用者對應用程式的安全性失去信心。最差的狀況是,攻擊者可能會提供特殊處理過的內容。這些內容專門用來模仿應用程式執行方式,但會要求使用者重新導向要求私人資訊,例如帳戶號碼和密碼,接著會將這些資訊回傳給攻擊者。

快取破壞:如果將惡意建構的回應快取到多個使用者使用的網頁快取或甚至單一使用者的瀏覽器快取,那麼影響所及會更大。如果將回應快取到共用網頁快取中 (例如代理伺服器中常見的網頁快取),那麼該快取的所有使用者將會繼續收到惡意內容,直到清除該快取項目為止。同樣的,如果回應貯存在單一使用者的瀏覽器中,那麼該使用者會繼續收到惡意的內容,直到清除快取項目為止,雖然只會影響本機瀏覽器實例的使用者。

Cross-Site Scripting:一旦攻擊者可以控制應用程式傳送的回應,他們就可以提供各種惡意內容給使用者。Cross-Site Scripting 是最常見的攻擊形式,此類攻擊會在回應中包含惡意的 JavaScript 或其他程式碼,且會在使用者的瀏覽器中執行。以 XSS 為基礎的攻擊手段花樣百出且幾乎無窮無盡,但是它們通常會傳輸 Cookie 或其他階段作業資訊之類的私人資料給攻擊者、將受害者重新導向到攻擊者控制的網頁內容,或者利用易受攻擊的網站,在使用者的機器上執行其他惡意操作。對於易受攻擊應用程式的使用者而言,最常見且最危險的攻擊方法就是使用 JavaScript 將階段作業與驗證資訊傳回給之後可以完全掌控受害者帳戶的攻擊者。

網頁劫持:除了利用易受攻擊的應用程式傳送惡意內容給使用者外,還可以利用具有相同本質的弱點,重新導向伺服器產生原本供使用者使用的敏感內容,轉而供攻擊者使用。藉由提交要求產生兩個回應,伺服器預期的回應和攻擊者產生的回應,攻擊者可能造成一個中間節點,例如一個共用的代理伺服器,來誤導伺服器針對使用者產生的回應傳遞給攻擊者。因為攻擊者所提出的要求產生兩個回應,第一個被解譯回應攻擊者的要求,而第二個被忘卻。當使用者透過相同 TCP 連線發出合法要求時,攻擊者的要求已處於等待狀態,並會被解讀成針對受害者要求的回應。接著,攻擊者會將第二個要求傳送到伺服器,且代理伺服器會將伺服器原本針對受害者要求產生的回應當作第二個要求的回應,如此一來,就會危及原本針對受害者的回應表頭或主體中的敏感資訊。

開放式重新導向:允許未經驗證的輸入來控制重新導向中使用的 URL,如此會助長網路釣魚攻擊。
References
[1] A. Klein Divide and Conquer: HTTP Response Splitting, Web Cache Poisoning Attacks, and Related Topics
[2] D. Crab HTTP Response Splitting
[3] Standards Mapping - Common Weakness Enumeration CWE ID 113
[4] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[6] Standards Mapping - FIPS200 SI
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[10] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[11] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[12] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[13] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[14] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[15] Standards Mapping - OWASP Top 10 2010 A1 Injection
[16] Standards Mapping - OWASP Top 10 2013 A1 Injection
[17] Standards Mapping - OWASP Top 10 2017 A1 Injection
[18] Standards Mapping - OWASP Top 10 2021 A03 Injection
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.1 - Web Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[31] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[53] Standards Mapping - Web Application Security Consortium Version 2.00 HTTP Response Splitting (WASC-25)
[54] Standards Mapping - Web Application Security Consortium 24 + 2 HTTP Response Splitting
desc.dataflow.vb.header_manipulation_cookies
Abstract
將未驗證的資料包含在 SMTP 表頭中,會讓攻擊者新增如 CCBCC 等任意表頭,這些表頭可用於將郵件內容洩漏給他們自己,或將郵件伺服器用作垃圾郵件機器人。
Explanation
SMTP Header Manipulation 弱點會在以下情況中出現:

1.資料透過不可信賴的來源進入應用程式,通常是 Web 應用程式中的 HTTP 要求。

2.SMTP 表頭中包含的資料未經驗證便傳送給郵件伺服器。

如同其他軟體安全性弱點,SMTP Header Manipulation 是達到目的的一種手段,而不是目的本身。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 SMTP 表頭中。

最常見的一種 SMTP Header Manipulation 攻擊是散發垃圾電子郵件。如果應用程式包含一個易受攻擊的「聯絡我們」表單,該表單允許設定電子郵件的主旨和內文,則從受害者伺服器傳送電子郵件之後,攻擊者即可設定任意內容,並注入包含電子郵件地址清單的 CC 表頭以匿名散發垃圾郵件。

範例 1:以下程式碼片段會讀取「聯絡我們」表單的主旨和內文:


func handler(w http.ResponseWriter, r *http.Request) {
subject := r.FormValue("subject")
body := r.FormValue("body")
auth := smtp.PlainAuth("identity", "user@example.com", "password", "mail.example.com")
to := []string{"recipient@example.net"}
msg := []byte("To: " + recipient1 + "\r\n" + subject + "\r\n" + body + "\r\n")
err := smtp.SendMail("mail.example.com:25", auth, "sender@example.org", to, msg)
if err != nil {
log.Fatal(err)
}
}


假設在要求中提交一個由標準英數字元所組成的字串,如「Page not working」,那麼 SMTP 表頭可能會採用下列形式:


...
subject: [Contact us query] Page not working
...


不過,因為表頭的值是根據未經驗證的使用者輸入建構的,所以只有當提交給 subject 的值不包含任何 CR 和 LF 字元時,回應才會保留這種形式。如果攻擊者提交惡意字串,例如「Congratulations!! You won the lottery!!!\r\ncc:victim1@mail.com,victim2@mail.com ...」,SMTP 表頭可能會採用以下形式:


...
subject: [Contact us query] Congratulations!! You won the lottery
cc: victim1@mail.com,victim2@mail.com
...


這實際上會讓攻擊者能修改垃圾郵件或在其他攻擊中傳送匿名電子郵件。
References
[1] Standards Mapping - Common Weakness Enumeration CWE ID 93
[2] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[3] Standards Mapping - FIPS200 SI
[4] Standards Mapping - General Data Protection Regulation (GDPR) Access Violation
[5] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[6] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[7] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[8] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[9] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[10] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[11] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[12] Standards Mapping - OWASP Top 10 2010 A1 Injection
[13] Standards Mapping - OWASP Top 10 2013 A1 Injection
[14] Standards Mapping - OWASP Top 10 2017 A1 Injection
[15] Standards Mapping - OWASP Top 10 2021 A03 Injection
[16] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[17] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[18] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[25] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[26] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[27] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[28] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[29] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[30] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[31] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[50] Standards Mapping - Web Application Security Consortium Version 2.00 Abuse of Functionality (WASC-42)
desc.dataflow.golang.header_manipulation_smtp
Abstract
將未驗證的資料包含在 SMTP 表頭中,會讓攻擊者新增如 CCBCC 任意表頭,攻擊者可使用這些表頭將郵件內容洩漏給他們自己,或將郵件伺服器用作垃圾郵件機器人。
Explanation
SMTP Header Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入應用程式,通常是 Web 應用程式中的 HTTP 要求。

2. SMTP 表頭中包含的資料未經驗證便傳送給郵件伺服器。

如同其他軟體安全性弱點,SMTP Header Manipulation 是達到目的的一種手段,而不是目的本身。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 SMTP 表頭中。

最常見的一種 SMTP Header Manipulation 攻擊,是用於散發垃圾電子郵件。如果應用程式包含一個易受攻擊的「聯絡我們」表單,該表單允許設定電子郵件的主旨和內文,則從受害者伺服器傳送電子郵件之後,攻擊者即可設定任意內容,並注入包含電子郵件地址清單的 CC 標頭以匿名散發垃圾郵件。

範例 1:以下程式碼片段會讀取「聯絡我們」表單的主旨和內文:


String subject = request.getParameter("subject");
String body = request.getParameter("body");
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress("webform@acme.com"));
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("support@acme.com"));
message.setSubject("[Contact us query] " + subject);
message.setText(body);
Transport.send(message);


假設在要求中提交一個由標準英數字元所組成的字串,如「Page not working」,那麼 SMTP 表頭可能會採用下列形式:


...
subject: [Contact us query] Page not working
...


不過,因為表頭的值是由未經驗證的使用者輸入建構,所以只有當為 subject 提交的值不包含任何 CR 和 LF 字元,回應才會保留這種形式。如果攻擊者提交惡意字串,例如「Congratulations!!You won the lottery!!!\r\ncc:victim1@mail.com,victim2@mail.com ...」,SMTP 表頭可能會採用以下形式:


...
subject: [Contact us query] Congratulations!! You won the lottery
cc: victim1@mail.com,victim2@mail.com
...


這將有效允許攻擊者修改垃圾郵件或在其他攻擊中傳送匿名電子郵件。
References
[1] OWASP Testing for IMAP/SMTP Injection (OTG-INPVAL-011)
[2] Vicente Aguilera Díaz MX Injection: Capturing and Exploiting Hidden Mail Servers
[3] Standards Mapping - Common Weakness Enumeration CWE ID 93
[4] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[5] Standards Mapping - FIPS200 SI
[6] Standards Mapping - General Data Protection Regulation (GDPR) Access Violation
[7] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[8] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[9] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[10] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[11] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[12] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[13] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[14] Standards Mapping - OWASP Top 10 2010 A1 Injection
[15] Standards Mapping - OWASP Top 10 2013 A1 Injection
[16] Standards Mapping - OWASP Top 10 2017 A1 Injection
[17] Standards Mapping - OWASP Top 10 2021 A03 Injection
[18] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[30] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[31] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Web Application Security Consortium Version 2.00 Abuse of Functionality (WASC-42)
desc.dataflow.java.header_manipulation_smtp
Abstract
Including unvalidated data in an SMTP header can enable attackers to add arbitrary headers, such as CC or BCC that they can use to leak the mail contents to themselves or use the mail server as a spam bot.
Explanation
SMTP Header Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入應用程式,通常是 Web 應用程式中的 HTTP 要求。

2. SMTP 表頭中包含的資料未經驗證便傳送給郵件伺服器。

如同其他軟體安全性弱點,SMTP Header Manipulation 是達到目的的一種手段,而不是目的本身。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 SMTP 表頭中。

常見的 SMTP Header Manipulation 攻擊之一就是散佈垃圾郵件。如果應用程式包含一個易受攻擊的「聯絡我們」表單,該表單允許設定電子郵件的主旨和內文,則從受害者伺服器傳送電子郵件之後,攻擊者即可設定任意內容,並插入包含電子郵件地址清單的 CC 表頭以匿名散發垃圾郵件。

範例 1:以下程式碼片段會讀取「聯絡我們」表單的主旨和內文:


$subject = $_GET['subject'];
$body = $_GET['body'];
mail("support@acme.com", "[Contact us query] " . $subject, $body);


假設在要求中提交一個由標準英數字元所組成的字串,如「Page not working」,那麼 SMTP 表頭可能會採用下列形式:


...
subject: [Contact us query] Page not working
...


不過,因為表頭的值是由未經驗證的使用者輸入建構,所以只有當為 subject 提交的值不包含任何 CR 和 LF 字元,回應才會保留這種形式。如果攻擊者提交惡意字串,例如「Congratulations!!You won the lottery!!!\r\ncc:victim1@mail.com,victim2@mail.com ...」,SMTP 表頭可能會採用以下形式:


...
subject: [Contact us query] Congratulations!! You won the lottery
cc: victim1@mail.com,victim2@mail.com
...


這將有效允許攻擊者修改垃圾郵件或在其他攻擊中傳送匿名電子郵件。
References
[1] OWASP Testing for IMAP/SMTP Injection (OTG-INPVAL-011)
[2] Vicente Aguilera Díaz MX Injection: Capturing and Exploiting Hidden Mail Servers
[3] Standards Mapping - Common Weakness Enumeration CWE ID 93
[4] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[5] Standards Mapping - FIPS200 SI
[6] Standards Mapping - General Data Protection Regulation (GDPR) Access Violation
[7] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[8] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[9] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[10] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[11] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[12] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[13] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[14] Standards Mapping - OWASP Top 10 2010 A1 Injection
[15] Standards Mapping - OWASP Top 10 2013 A1 Injection
[16] Standards Mapping - OWASP Top 10 2017 A1 Injection
[17] Standards Mapping - OWASP Top 10 2021 A03 Injection
[18] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[30] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[31] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Web Application Security Consortium Version 2.00 Abuse of Functionality (WASC-42)
desc.dataflow.php.header_manipulation_smtp
Abstract
Including unvalidated data in an SMTP header can enable attackers to add arbitrary headers, such as CC or BCC that they can use to leak the mail contents to themselves or use the mail server as a spam bot.
Explanation
SMTP Header Manipulation 弱點會在以下情況中出現:

1. 資料透過不可信賴的來源進入應用程式,通常是 Web 應用程式中的 HTTP 要求。

2. SMTP 表頭中包含的資料未經驗證便傳送給郵件伺服器。

如同其他軟體安全性弱點,SMTP Header Manipulation 是達到目的的一種手段,而不是目的本身。此弱點的基礎很簡單:攻擊者傳送惡意資料至有弱點的應用程式,應用程式再將該資料包含於 SMTP 表頭中。

常見的 SMTP Header Manipulation 攻擊之一就是散佈垃圾郵件。如果應用程式包含一個易受攻擊的「聯絡我們」表單,該表單允許設定電子郵件的主旨和內文,則從受害者伺服器傳送電子郵件之後,攻擊者即可設定任意內容,並插入包含電子郵件地址清單的 CC 表頭以匿名散發垃圾郵件。

範例 1:以下程式碼片段會讀取「聯絡我們」表單的主旨和內文:


body = request.GET['body']
subject = request.GET['subject']
session = smtplib.SMTP(smtp_server, smtp_tls_port)
session.ehlo()
session.starttls()
session.login(username, password)
headers = "\r\n".join(["from: webform@acme.com",
"subject: [Contact us query] " + subject,
"to: support@acme.com",
"mime-version: 1.0",
"content-type: text/html"])
content = headers + "\r\n\r\n" + body
session.sendmail("webform@acme.com", "support@acme.com", content)


假設在要求中提交一個由標準英數字元所組成的字串,如「Page not working」,那麼 SMTP 表頭可能會採用下列形式:


...
subject: [Contact us query] Page not working
...


不過,因為表頭的值是由未經驗證的使用者輸入建構,所以只有當為 subject 提交的值不包含任何 CR 和 LF 字元,回應才會保留這種形式。如果攻擊者提交惡意字串,例如「Congratulations!!You won the lottery!!!\r\ncc:victim1@mail.com,victim2@mail.com ...」,SMTP 表頭可能會採用以下形式:


...
subject: [Contact us query] Congratulations!! You won the lottery
cc: victim1@mail.com,victim2@mail.com
...


這將有效允許攻擊者修改垃圾郵件或在其他攻擊中傳送匿名電子郵件。
References
[1] OWASP Testing for IMAP/SMTP Injection (OTG-INPVAL-011)
[2] Vicente Aguilera Díaz MX Injection: Capturing and Exploiting Hidden Mail Servers
[3] Standards Mapping - Common Weakness Enumeration CWE ID 93
[4] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[5] Standards Mapping - FIPS200 SI
[6] Standards Mapping - General Data Protection Regulation (GDPR) Access Violation
[7] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[8] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[9] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[10] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[11] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-1
[12] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[13] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[14] Standards Mapping - OWASP Top 10 2010 A1 Injection
[15] Standards Mapping - OWASP Top 10 2013 A1 Injection
[16] Standards Mapping - OWASP Top 10 2017 A1 Injection
[17] Standards Mapping - OWASP Top 10 2021 A03 Injection
[18] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[27] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[28] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[30] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[31] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[32] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[33] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[34] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[52] Standards Mapping - Web Application Security Consortium Version 2.00 Abuse of Functionality (WASC-42)
desc.dataflow.python.header_manipulation_smtp
Abstract
請勿使用 realloc() 來調整儲存敏感資訊的緩衝區大小。此函數可能會將敏感資訊的副本鎖在記憶體中,無法覆寫。
Explanation
當敏感資料 (如密碼或密鑰) 沒有從記憶體中刪除而被駭客看到的時候,就會產生 Heap Inspection 弱點。

realloc() 函數通常是用來提高分配記憶體區塊的大小。此操作通常需要將舊記憶體區塊中的內容轉移到容量更大的新記憶體區塊。它會完整無缺地保留原來記憶體區塊中的內容,但是不會讓程式得到任何內容,藉此阻止了程式清除記憶體中敏感資訊的能力。如果攻擊者之後能夠檢查記憶體傾印的內容,敏感資料就會暴露出來。

範例 1:以下程式碼在包含敏感資料的緩衝區中呼叫了 realloc()


plaintext_buffer = get_secret();
...
plaintext_buffer = realloc(plaintext_buffer, 1024);
...
scrub_memory(plaintext_buffer, 1024);


這嘗試清除記憶體中的敏感資料,但因為使用了 realloc(),所以資料副本仍然會在原來對 plaintext_buffer 分配的記憶體中暴露出來。
References
[1] Standards Mapping - Common Weakness Enumeration CWE ID 244
[2] Standards Mapping - Common Weakness Enumeration Top 25 2019 [4] CWE ID 200
[3] Standards Mapping - Common Weakness Enumeration Top 25 2020 [7] CWE ID 200
[4] Standards Mapping - Common Weakness Enumeration Top 25 2021 [20] CWE ID 200
[5] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001090, CCI-001199
[6] Standards Mapping - FIPS200 MP
[7] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[8] Standards Mapping - NIST Special Publication 800-53 Revision 4 SC-4 Information in Shared Resources (P1), SC-28 Protection of Information at Rest (P1)
[9] Standards Mapping - NIST Special Publication 800-53 Revision 5 SC-4 Information in Shared System Resources, SC-28 Protection of Information at Rest
[10] Standards Mapping - OWASP Application Security Verification Standard 4.0 8.3.4 Sensitive Private Data (L1 L2 L3), 8.3.6 Sensitive Private Data (L2 L3)
[11] Standards Mapping - OWASP Mobile 2014 M4 Unintended Data Leakage
[12] Standards Mapping - OWASP Mobile 2024 M6 Inadequate Privacy Controls
[13] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-STORAGE-2
[14] Standards Mapping - OWASP Top 10 2004 A8 Insecure Storage
[15] Standards Mapping - OWASP Top 10 2007 A8 Insecure Cryptographic Storage
[16] Standards Mapping - OWASP Top 10 2010 A7 Insecure Cryptographic Storage
[17] Standards Mapping - OWASP Top 10 2013 A6 Sensitive Data Exposure
[18] Standards Mapping - OWASP Top 10 2017 A3 Sensitive Data Exposure
[19] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 3.4, Requirement 6.5.8, Requirement 8.4
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 3.4, Requirement 6.3.1.3, Requirement 6.5.8, Requirement 8.4
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 3.4, Requirement 6.5.3, Requirement 8.4
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 3.4, Requirement 6.5.3, Requirement 8.2.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 3.4, Requirement 6.5.3, Requirement 8.2.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 3.4, Requirement 6.5.3, Requirement 8.2.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 3.4, Requirement 6.5.3, Requirement 8.2.1
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 3.5.1, Requirement 6.2.4, Requirement 8.3.1
[28] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 3.3.2, Requirement 3.3.3, Requirement 3.5.1, Requirement 6.2.4, Requirement 8.3.1
[29] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 3.5 - Sensitive Data Retention
[30] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 3.5 - Sensitive Data Retention
[31] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 3.5 - Sensitive Data Retention
[32] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3230.2 CAT II
[33] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3230.2 CAT II
[34] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3230.2 CAT II
[35] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3230.2 CAT II
[36] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3230.2 CAT II
[37] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3230.2 CAT II
[38] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3230.2 CAT II
[39] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[40] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[41] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[42] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[43] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[44] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[45] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[46] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[47] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[48] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[49] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[50] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[51] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[52] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[53] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[54] Standards Mapping - Web Application Security Consortium Version 2.00 Information Leakage (WASC-13)
[55] Standards Mapping - Web Application Security Consortium 24 + 2 Information Leakage
desc.semantic.cpp.heap_inspection
Abstract
請勿使用 VirtualLock 來鎖定包含敏感資料的頁面。此函數並不是隨時都可執行的。
Explanation
當敏感資料 (如密碼或密鑰) 沒有從記憶體中刪除而被駭客看到的時候,就會產生 Heap Inspection 弱點。

VirtualLock 函數是用來鎖住記憶體的頁面,以防止在磁碟中被分頁。然而,在 Windows 95/98/ME 作業系統裡,這個函數是不能完整執行的,而且沒有任何影響。

References
[1] Standards Mapping - Common Weakness Enumeration CWE ID 591
[2] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001090, CCI-001199
[3] Standards Mapping - FIPS200 MP
[4] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[5] Standards Mapping - NIST Special Publication 800-53 Revision 4 SC-4 Information in Shared Resources (P1), SC-28 Protection of Information at Rest (P1)
[6] Standards Mapping - NIST Special Publication 800-53 Revision 5 SC-4 Information in Shared System Resources, SC-28 Protection of Information at Rest
[7] Standards Mapping - OWASP Mobile 2014 M4 Unintended Data Leakage
[8] Standards Mapping - OWASP Mobile 2024 M6 Inadequate Privacy Controls
[9] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-STORAGE-2
[10] Standards Mapping - OWASP Top 10 2004 A8 Insecure Storage
[11] Standards Mapping - OWASP Top 10 2007 A8 Insecure Cryptographic Storage
[12] Standards Mapping - OWASP Top 10 2010 A7 Insecure Cryptographic Storage
[13] Standards Mapping - OWASP Top 10 2013 A6 Sensitive Data Exposure
[14] Standards Mapping - OWASP Top 10 2017 A3 Sensitive Data Exposure
[15] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[16] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 3.4, Requirement 6.5.8, Requirement 8.4
[17] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 3.4, Requirement 6.3.1.3, Requirement 6.5.8, Requirement 8.4
[18] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 3.4, Requirement 6.5.3, Requirement 8.4
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 3.4, Requirement 6.5.3, Requirement 8.2.1
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 3.4, Requirement 6.5.3, Requirement 8.2.1
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 3.4, Requirement 6.5.3, Requirement 8.2.1
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 3.4, Requirement 6.5.3, Requirement 8.2.1
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 3.5.1, Requirement 6.2.4, Requirement 8.3.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 3.3.2, Requirement 3.3.3, Requirement 3.5.1, Requirement 6.2.4, Requirement 8.3.1
[25] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 3.5 - Sensitive Data Retention, Control Objective 6.3 - Sensitive Data Protection, Control Objective 7 - Use of Cryptography
[26] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 3.5 - Sensitive Data Retention, Control Objective 6.3 - Sensitive Data Protection, Control Objective 7 - Use of Cryptography
[27] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 3.5 - Sensitive Data Retention, Control Objective 6.3 - Sensitive Data Protection, Control Objective 7 - Use of Cryptography
[28] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3230.2 CAT II
[29] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3230.2 CAT II
[30] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3230.2 CAT II
[31] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3230.2 CAT II
[32] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3230.2 CAT II
[33] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3230.2 CAT II
[34] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3230.2 CAT II
[35] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[36] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[37] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[38] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[39] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[40] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[41] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[42] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[43] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[44] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[45] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[46] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[47] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[48] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[49] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002330 CAT II, APSC-DV-002380 CAT II
[50] Standards Mapping - Web Application Security Consortium Version 2.00 Information Leakage (WASC-13)
[51] Standards Mapping - Web Application Security Consortium 24 + 2 Information Leakage
desc.semantic.cpp.heap_inspection_swappable_memory
Abstract
針對所有版本的 Internet Explorer 將 X-XSS-Protection 設定為 1; mode=block,會在舊版瀏覽器中開啟 Cross-site scripting 弱點。
Explanation
X-XSS-Protection 是由 Microsoft 引入的 HTTP 標頭,後來由其他瀏覽器所採用。這旨在協助阻止 Cross-Site Scripting 攻擊成功,但不慎導致弱點的情況,使得安全網站易受攻擊[1]。因此,不應在舊版 Internet Explorer 中使用此標頭,並且應透過將標頭設定為 0 將其停用。

範例 1:以下錯誤地配置了 Express 應用程式中的 Helmet 中介軟體,以針對所有版本的 Internet Explorer 啟用此標頭:


var express = require('express');
var app = express();
var helmet = require('helmet');

...
app.use(helmet.xssFilter({ setOnOldIE: true}));
...
References
[1] Eduardo Vela Nava, David Lindsay Abusing Internet Explorer 8's XSS Filters
[2] Standards Mapping - Common Weakness Enumeration CWE ID 554
[3] Standards Mapping - Common Weakness Enumeration Top 25 2019 [3] CWE ID 020
[4] Standards Mapping - Common Weakness Enumeration Top 25 2020 [3] CWE ID 020
[5] Standards Mapping - Common Weakness Enumeration Top 25 2021 [4] CWE ID 020
[6] Standards Mapping - Common Weakness Enumeration Top 25 2022 [4] CWE ID 020
[7] Standards Mapping - Common Weakness Enumeration Top 25 2023 [6] CWE ID 020
[8] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[9] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[10] Standards Mapping - FIPS200 CM
[11] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[12] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[13] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[14] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.1.3 Input Validation Requirements (L1 L2 L3), 5.1.4 Input Validation Requirements (L1 L2 L3), 14.1.3 Build (L2 L3)
[15] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[16] Standards Mapping - OWASP Mobile 2024 M8 Security Misconfiguration
[17] Standards Mapping - OWASP Top 10 2004 A10 Insecure Configuration Management
[18] Standards Mapping - OWASP Top 10 2010 A6 Security Misconfiguration
[19] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration
[20] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration
[21] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.10
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.1
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[28] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[29] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[30] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[31] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[32] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection
[33] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection
[34] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[35] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[53] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[54] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002560 CAT I
[55] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002560 CAT I
[56] Standards Mapping - Web Application Security Consortium Version 2.00 Improper Input Handling (WASC-20)
desc.dataflow.javascript.helmet_misconfiguration_insecure_xss_filter
Abstract
程式會建立隱藏表單欄位。
Explanation
程式設計師通常會信任隱藏欄位的內容,預期使用者無法檢視或竄改他們的內容。攻擊者將會推翻這些假設。他們會檢查寫入隱藏欄位的值並加以修改,或以攻擊資料取代這些內容。

範例 1:

HtmlInputHidden hidden = new HtmlInputHidden();


若隱藏欄位具有敏感資訊,該資訊的快取方式將與其他的頁面相同。這可能會導致敏感資訊在使用者不知情的狀況下貯存至瀏覽器快取中。
References
[1] Standards Mapping - Common Weakness Enumeration CWE ID 472
[2] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002420
[3] Standards Mapping - NIST Special Publication 800-53 Revision 4 SC-8 Transmission Confidentiality and Integrity (P1)
[4] Standards Mapping - NIST Special Publication 800-53 Revision 5 SC-8 Transmission Confidentiality and Integrity
[5] Standards Mapping - OWASP Mobile 2014 M4 Unintended Data Leakage
[6] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-STORAGE-2
[7] Standards Mapping - OWASP Top 10 2021 A04 Insecure Design
[8] Standards Mapping - SANS Top 25 2009 Risky Resource Management - CWE ID 642
[9] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3610 CAT I
[10] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3610 CAT I
[11] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3610 CAT I
[12] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3610 CAT I
[13] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3610 CAT I
[14] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3610 CAT I
[15] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3610 CAT I
[16] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002485 CAT I
[17] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002485 CAT I
[18] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002485 CAT I
[19] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002485 CAT I
[20] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002485 CAT I
[21] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002485 CAT I
[22] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002485 CAT I
[23] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002485 CAT I
[24] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002485 CAT I
[25] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002485 CAT I
[26] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002485 CAT I
[27] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002485 CAT I
[28] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002485 CAT I
[29] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002485 CAT I
[30] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002485 CAT I
[31] Standards Mapping - Web Application Security Consortium Version 2.00 Information Leakage (WASC-13)
[32] Standards Mapping - Web Application Security Consortium 24 + 2 Information Leakage
desc.semantic.dotnet.hidden_field
Abstract
程式會建立隱藏表單欄位。
Explanation
程式設計師通常會信任隱藏欄位的內容,預期使用者無法檢視或竄改他們的內容。攻擊者將會推翻這些假設。他們會檢查寫入隱藏欄位的值並加以修改,或以攻擊資料取代這些內容。

範例 1:

Hidden hidden = new Hidden(element);


若隱藏欄位具有敏感資訊,該資訊的快取方式將與其他的頁面相同。這可能會導致敏感資訊在使用者不知情的狀況下貯存至瀏覽器快取中。
References
[1] IDS14-J. Do not trust the contents of hidden form fields CERT
[2] Standards Mapping - Common Weakness Enumeration CWE ID 472
[3] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002420
[4] Standards Mapping - NIST Special Publication 800-53 Revision 4 SC-8 Transmission Confidentiality and Integrity (P1)
[5] Standards Mapping - NIST Special Publication 800-53 Revision 5 SC-8 Transmission Confidentiality and Integrity
[6] Standards Mapping - OWASP Mobile 2014 M4 Unintended Data Leakage
[7] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-STORAGE-2
[8] Standards Mapping - OWASP Top 10 2021 A04 Insecure Design
[9] Standards Mapping - SANS Top 25 2009 Risky Resource Management - CWE ID 642
[10] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3610 CAT I
[11] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3610 CAT I
[12] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3610 CAT I
[13] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3610 CAT I
[14] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3610 CAT I
[15] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3610 CAT I
[16] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3610 CAT I
[17] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002485 CAT I
[18] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002485 CAT I
[19] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002485 CAT I
[20] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002485 CAT I
[21] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002485 CAT I
[22] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002485 CAT I
[23] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002485 CAT I
[24] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002485 CAT I
[25] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002485 CAT I
[26] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002485 CAT I
[27] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002485 CAT I
[28] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002485 CAT I
[29] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002485 CAT I
[30] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002485 CAT I
[31] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002485 CAT I
[32] Standards Mapping - Web Application Security Consortium Version 2.00 Information Leakage (WASC-13)
[33] Standards Mapping - Web Application Security Consortium 24 + 2 Information Leakage
desc.semantic.java.hidden_field
Abstract
已使用隱藏表單欄位。
Explanation
程式設計師通常會信任隱藏欄位的內容,預期使用者無法檢視或竄改他們的內容。攻擊者將會推翻這些假設。他們會檢查寫入隱藏欄位的值並加以修改,或以攻擊資料取代這些內容。

範例 1:hidden 類型的 <input> 標籤表示使用隱藏欄位。

<input type="hidden">


若隱藏欄位具有敏感資訊,該資訊的快取方式將與其他的頁面相同。這可能會導致敏感資訊在使用者不知情的狀況下貯存至瀏覽器快取中。
References
[1] Standards Mapping - Common Weakness Enumeration CWE ID 472
[2] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002420
[3] Standards Mapping - NIST Special Publication 800-53 Revision 4 SC-8 Transmission Confidentiality and Integrity (P1)
[4] Standards Mapping - NIST Special Publication 800-53 Revision 5 SC-8 Transmission Confidentiality and Integrity
[5] Standards Mapping - OWASP Mobile 2014 M4 Unintended Data Leakage
[6] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-STORAGE-2
[7] Standards Mapping - OWASP Top 10 2021 A04 Insecure Design
[8] Standards Mapping - SANS Top 25 2009 Risky Resource Management - CWE ID 642
[9] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3610 CAT I
[10] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3610 CAT I
[11] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3610 CAT I
[12] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3610 CAT I
[13] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3610 CAT I
[14] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3610 CAT I
[15] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3610 CAT I
[16] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002485 CAT I
[17] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002485 CAT I
[18] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002485 CAT I
[19] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002485 CAT I
[20] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002485 CAT I
[21] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002485 CAT I
[22] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002485 CAT I
[23] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002485 CAT I
[24] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002485 CAT I
[25] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002485 CAT I
[26] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002485 CAT I
[27] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002485 CAT I
[28] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002485 CAT I
[29] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002485 CAT I
[30] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002485 CAT I
[31] Standards Mapping - Web Application Security Consortium Version 2.00 Information Leakage (WASC-13)
[32] Standards Mapping - Web Application Security Consortium 24 + 2 Information Leakage
desc.content.html.hidden_field
Abstract
X-XSS-Protection 表頭已明確停用,這可能會增加 Cross-site scripting 攻擊的風險。
Explanation
在現代瀏覽器中,通常預設啟用 X-XSS-Protection 標頭。設定標頭值為 false (0) 時,會停用 Cross-Site Scripting 保護。

可在多個位置設定表頭,並應檢查該表頭是否存在配置錯誤與惡意篡改。
References
[1] IE8 Security Part IV: The XSS Filter
[2] OWASP OWASP Secure Headers Project
[3] HttpResponse.AppendHeader Method
[4] How to prevent cross-site scripting security issues
[5] HOW TO: Disable the Documentation Protocol for ASP.NET Web Services
[6] Configuring Services Using Configuration Files
[7] Standards Mapping - Common Weakness Enumeration CWE ID 554, CWE ID 1173
[8] Standards Mapping - Common Weakness Enumeration Top 25 2019 [3] CWE ID 020
[9] Standards Mapping - Common Weakness Enumeration Top 25 2020 [3] CWE ID 020
[10] Standards Mapping - Common Weakness Enumeration Top 25 2021 [4] CWE ID 020
[11] Standards Mapping - Common Weakness Enumeration Top 25 2022 [4] CWE ID 020
[12] Standards Mapping - Common Weakness Enumeration Top 25 2023 [6] CWE ID 020
[13] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[14] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[15] Standards Mapping - FIPS200 CM
[16] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[17] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[18] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[19] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.1.3 Input Validation Requirements (L1 L2 L3), 5.1.4 Input Validation Requirements (L1 L2 L3), 14.1.3 Build (L2 L3)
[20] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[21] Standards Mapping - OWASP Mobile 2024 M8 Security Misconfiguration
[22] Standards Mapping - OWASP Top 10 2004 A10 Insecure Configuration Management
[23] Standards Mapping - OWASP Top 10 2010 A6 Security Misconfiguration
[24] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration
[25] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration
[26] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.10
[28] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1
[29] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[30] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[31] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.7
[32] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.7
[33] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.7
[34] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[35] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[36] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[37] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[38] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[39] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[53] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[54] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[55] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[56] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[57] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[58] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[59] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[60] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[61] Standards Mapping - Web Application Security Consortium Version 2.00 Application Misconfiguration (WASC-15)
desc.structural.dotnet.html5_xss_protection
Abstract
X-XSS-Protection 標頭已明確停用,這可能會增加 Cross-Site Scripting 攻擊的風險。
Explanation
在現代瀏覽器中,通常預設啟用 X-XSS-Protection 標頭。設定標頭值為 false (0) 時,會停用 Cross-Site Scripting 保護。

可在多個位置設定標頭,並應檢查該標頭是否存在配置錯誤與惡意篡改。

範例 1:以下程式碼會將受 Spring Security 保護的應用程式設定為停用 XSS 保護:

<http auto-config="true">
...
<headers>
...
<xss-protection xss-protection-enabled="false" />
</headers>
</http>
References
[1] IE8 Security Part IV: The XSS Filter
[2] OWASP OWASP Secure Headers Project
[3] Standards Mapping - Common Weakness Enumeration CWE ID 554, CWE ID 1173
[4] Standards Mapping - Common Weakness Enumeration Top 25 2019 [3] CWE ID 020
[5] Standards Mapping - Common Weakness Enumeration Top 25 2020 [3] CWE ID 020
[6] Standards Mapping - Common Weakness Enumeration Top 25 2021 [4] CWE ID 020
[7] Standards Mapping - Common Weakness Enumeration Top 25 2022 [4] CWE ID 020
[8] Standards Mapping - Common Weakness Enumeration Top 25 2023 [6] CWE ID 020
[9] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[10] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[11] Standards Mapping - FIPS200 CM
[12] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[13] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[14] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[15] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.1.3 Input Validation Requirements (L1 L2 L3), 5.1.4 Input Validation Requirements (L1 L2 L3), 14.1.3 Build (L2 L3)
[16] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[17] Standards Mapping - OWASP Mobile 2024 M8 Security Misconfiguration
[18] Standards Mapping - OWASP Top 10 2004 A10 Insecure Configuration Management
[19] Standards Mapping - OWASP Top 10 2010 A6 Security Misconfiguration
[20] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration
[21] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration
[22] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.10
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.7
[28] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.7
[29] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.7
[30] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[31] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[32] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[33] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[34] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[35] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[36] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[53] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[54] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[55] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[56] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[57] Standards Mapping - Web Application Security Consortium Version 2.00 Application Misconfiguration (WASC-15)
desc.config.java.html5_cross_site_scripting_protection
Abstract
X-XSS-Protection 表頭已明確停用,這可能會增加 Cross-site scripting 攻擊的風險。
Explanation
在現代瀏覽器中,通常預設啟用 X-XSS-Protection 標頭。設定標頭值為 false (0) 時,會停用 Cross-Site Scripting 保護。
可在多個位置設定表頭,並應檢查該表頭是否存在配置錯誤與惡意篡改。
References
[1] IE8 Security Part IV: The XSS Filter
[2] OWASP OWASP Secure Headers Project
[3] Node.js Security Checklist
[4] Standards Mapping - Common Weakness Enumeration CWE ID 554, CWE ID 1173
[5] Standards Mapping - Common Weakness Enumeration Top 25 2019 [3] CWE ID 020
[6] Standards Mapping - Common Weakness Enumeration Top 25 2020 [3] CWE ID 020
[7] Standards Mapping - Common Weakness Enumeration Top 25 2021 [4] CWE ID 020
[8] Standards Mapping - Common Weakness Enumeration Top 25 2022 [4] CWE ID 020
[9] Standards Mapping - Common Weakness Enumeration Top 25 2023 [6] CWE ID 020
[10] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[11] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[12] Standards Mapping - FIPS200 CM
[13] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[14] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[15] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[16] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.1.3 Input Validation Requirements (L1 L2 L3), 5.1.4 Input Validation Requirements (L1 L2 L3), 14.1.3 Build (L2 L3)
[17] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[18] Standards Mapping - OWASP Mobile 2024 M8 Security Misconfiguration
[19] Standards Mapping - OWASP Top 10 2004 A10 Insecure Configuration Management
[20] Standards Mapping - OWASP Top 10 2010 A6 Security Misconfiguration
[21] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration
[22] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration
[23] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.10
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[28] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.7
[29] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.7
[30] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.7
[31] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[32] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[33] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[34] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[35] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[36] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[53] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[54] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[55] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[56] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[57] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[58] Standards Mapping - Web Application Security Consortium Version 2.00 Application Misconfiguration (WASC-15)
desc.dataflow.javascript.html5_cross_site_scripting_protection
Abstract
X-XSS-Protection 表頭已明確停用,這可能會增加 Cross-site scripting 攻擊的風險。
Explanation
在現代瀏覽器中,通常預設啟用 X-XSS-Protection 標頭。設定標頭值為 false (0) 時,會停用 Cross-Site Scripting 保護。

可在多個位置設定表頭,並應檢查該表頭是否存在配置錯誤與惡意篡改。
References
[1] IE8 Security Part IV: The XSS Filter
[2] OWASP OWASP Secure Headers Project
[3] django-secure
[4] SECURE_BROWSER_XSS_FILTER
[5] Standards Mapping - Common Weakness Enumeration CWE ID 554, CWE ID 1173
[6] Standards Mapping - Common Weakness Enumeration Top 25 2019 [3] CWE ID 020
[7] Standards Mapping - Common Weakness Enumeration Top 25 2020 [3] CWE ID 020
[8] Standards Mapping - Common Weakness Enumeration Top 25 2021 [4] CWE ID 020
[9] Standards Mapping - Common Weakness Enumeration Top 25 2022 [4] CWE ID 020
[10] Standards Mapping - Common Weakness Enumeration Top 25 2023 [6] CWE ID 020
[11] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[12] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[13] Standards Mapping - FIPS200 CM
[14] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[15] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[16] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[17] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.1.3 Input Validation Requirements (L1 L2 L3), 5.1.4 Input Validation Requirements (L1 L2 L3), 14.1.3 Build (L2 L3)
[18] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[19] Standards Mapping - OWASP Mobile 2024 M8 Security Misconfiguration
[20] Standards Mapping - OWASP Top 10 2004 A10 Insecure Configuration Management
[21] Standards Mapping - OWASP Top 10 2010 A6 Security Misconfiguration
[22] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration
[23] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration
[24] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.10
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.1
[28] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.1
[29] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.7
[30] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.7
[31] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.7
[32] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[33] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[34] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[35] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[36] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[37] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[53] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[54] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[55] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[56] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[57] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[58] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[59] Standards Mapping - Web Application Security Consortium Version 2.00 Application Misconfiguration (WASC-15)
desc.structural.python.html5_cross_site_scripting_protection
Abstract
易猜的 Web SQL 資料庫名稱可能會導致資料失竊以及資料庫被未授權的對象毀損。
Explanation
HTML5 的功能之一便是在用戶端 SQL 資料庫儲存資料的能力。開始從資料庫寫入和讀取時,最重要的資訊就是其名稱。因此,各使用者的資料庫名稱必須為唯一字串。如果資料庫名稱很容易猜中,那麼未授權的對象 (如其他使用者) 便可能偷取敏感資料或毀損資料庫項目。
範例 1:下列程式碼使用了易於猜中的資料庫名稱:


...
var db = openDatabase('mydb', '1.0', 'Test DB', 2 * 1024 * 1024);
...


此程式碼將成功執行,但能夠猜到資料庫名稱為 'mydb' 的人都可以加以存取。
References
[1] HTML5 Security Cheatsheet
[2] Standards Mapping - Common Weakness Enumeration CWE ID 330
[3] Standards Mapping - FIPS200 MP
[4] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[5] Standards Mapping - NIST Special Publication 800-53 Revision 4 SC-28 Protection of Information at Rest (P1)
[6] Standards Mapping - NIST Special Publication 800-53 Revision 5 SC-28 Protection of Information at Rest
[7] Standards Mapping - OWASP Mobile 2014 M5 Poor Authorization and Authentication
[8] Standards Mapping - OWASP Mobile 2024 M3 Insecure Authentication/Authorization
[9] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-AUTH-1
[10] Standards Mapping - OWASP Top 10 2004 A8 Insecure Storage
[11] Standards Mapping - OWASP Top 10 2007 A8 Insecure Cryptographic Storage
[12] Standards Mapping - OWASP Top 10 2010 A7 Insecure Cryptographic Storage
[13] Standards Mapping - OWASP Top 10 2013 A6 Sensitive Data Exposure
[14] Standards Mapping - OWASP Top 10 2017 A3 Sensitive Data Exposure
[15] Standards Mapping - OWASP Top 10 2021 A02 Cryptographic Failures
[16] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.8
[17] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.3, Requirement 6.5.8
[18] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.3
[19] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.3
[20] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.3
[21] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.3
[22] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.3
[23] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[25] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 7 - Use of Cryptography
[26] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 7 - Use of Cryptography
[27] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 7 - Use of Cryptography
[28] Standards Mapping - SANS Top 25 2009 Porous Defenses - CWE ID 330
[29] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3150.2 CAT II
[30] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3150.2 CAT II
[31] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3150.2 CAT II
[32] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3150.2 CAT II
[33] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3150.2 CAT II
[34] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3150.2 CAT II
[35] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3150.2 CAT II
[36] Standards Mapping - Web Application Security Consortium Version 2.00 Predictable Resource Location (WASC-34)
[37] Standards Mapping - Web Application Security Consortium 24 + 2 Information Leakage
desc.structural.javascript.html5_easy_to_guess_database_name
Abstract
已停用 HTML5 輸入表單欄位驗證。
Explanation
HTML5 提供了簡易輸入表單欄位驗證的新功能。您可以藉由 required 屬性指定輸入表單欄位是否為必要。指定表單類型可確保輸入內容會根據其類型進行檢驗。您甚至可以提供自訂 pattern 屬性,根據一般表示式檢查輸入內容。但是,若在表單標籤上新增 novalidate,並在提交輸入標籤上新增 formnovalidate 屬性,則此驗證便會停用。

範例 1: 下列範例藉由 novalidate 屬性停用表單驗證。


<form action="demo_form.asp" novalidate="novalidate">
E-mail: <input type="email" name="user_email" />
<input type="submit" />
</form>
範例 2: 下列範例藉由 formnovalidate 屬性停用表單驗證。


<form action="demo_form.asp" >
E-mail: <input type="email" name="user_email" />
<input type="submit" formnovalidate="formnovalidate"/>
</form>


停用驗證的 HTML 表單對使用者而言並不方便,且可能造成伺服器面臨各種類型的攻擊。未經驗證的輸入是導致各種弱點的根源,如 cross-site scripting、process control 和 SQL injection。
References
[1] HTML5 form novalidate Attribute W3Schools
[2] HTML5 input formnovalidate Attribute W3Schools
[3] Standards Mapping - Common Weakness Enumeration CWE ID 1173
[4] Standards Mapping - Common Weakness Enumeration Top 25 2019 [3] CWE ID 020
[5] Standards Mapping - Common Weakness Enumeration Top 25 2020 [3] CWE ID 020
[6] Standards Mapping - Common Weakness Enumeration Top 25 2021 [4] CWE ID 020
[7] Standards Mapping - Common Weakness Enumeration Top 25 2022 [4] CWE ID 020
[8] Standards Mapping - Common Weakness Enumeration Top 25 2023 [6] CWE ID 020
[9] Standards Mapping - Common Weakness Enumeration Top 25 2024 [12] CWE ID 020
[10] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[11] Standards Mapping - FIPS200 SI
[12] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[13] Standards Mapping - NIST Special Publication 800-53 Revision 4 SI-10 Information Input Validation (P1)
[14] Standards Mapping - NIST Special Publication 800-53 Revision 5 SI-10 Information Input Validation
[15] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.1.3 Input Validation Requirements (L1 L2 L3), 5.1.4 Input Validation Requirements (L1 L2 L3)
[16] Standards Mapping - OWASP Mobile 2014 M8 Security Decisions Via Untrusted Inputs
[17] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[18] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4, MASVS-PLATFORM-2
[19] Standards Mapping - OWASP Top 10 2004 A1 Unvalidated Input
[20] Standards Mapping - OWASP Top 10 2010 A6 Security Misconfiguration
[21] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration
[22] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration
[23] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[24] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.1
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 Requirement 6.5.6
[27] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.6
[28] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.6
[29] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.6
[30] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.6
[31] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[32] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[33] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[34] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation
[35] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective B.3.1 - Terminal Software Attack Mitigation, Control Objective B.3.1.1 - Terminal Software Attack Mitigation, Control Objective C.3.2 - Web Software Attack Mitigation
[36] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I
[37] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I
[38] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[53] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[54] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[55] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[56] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[57] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[58] Standards Mapping - Web Application Security Consortium Version 2.00 Application Misconfiguration (WASC-15)
desc.content.html.html5_form_validation_turned_off
Abstract
程式定義了過度許可的 Cross-Origin Opener Policy (COOP)
Explanation
由於 Spectre 和 Meltdown 等弱點導致側通道攻擊的存在,因此強制執行指定 Web 文件的資料隱私變得非常重要。Cross-Origin Opener Policy (COOP) 的建立就是為了幫助防止因側通道攻擊而導致敏感資訊暴露。具體來說,COOP 可以強制執行文件瀏覽情境群組與其他外部文件 (例如彈出視窗) 的隔離。

範例 1:以下程式碼顯示 Django 架構中不安全的 COOP 設定 'unsafe-none'。由於側通道攻擊,這可能會允許外部文件存取來源文件的瀏覽情境群組的私有資料。


SECURE_CROSS_ORIGIN_OPENER_POLICY = 'unsafe-none'
References
[1] Eiji Kitamura, Domenic Denicola Why you need "cross-origin isolated" for powerful features
[2] Standards Mapping - Common Weakness Enumeration CWE ID 346
[3] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001368, CCI-001414
[4] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data
[5] Standards Mapping - NIST Special Publication 800-53 Revision 4 AC-4 Information Flow Enforcement (P1)
[6] Standards Mapping - NIST Special Publication 800-53 Revision 5 AC-4 Information Flow Enforcement
[7] Standards Mapping - OWASP API 2023 API8 Security Misconfiguration
[8] Standards Mapping - OWASP Application Security Verification Standard 4.0 3.5.3 Token-based Session Management (L2 L3), 5.3.6 Output Encoding and Injection Prevention Requirements (L1 L2 L3), 14.5.2 Validate HTTP Request Header Requirements (L1 L2 L3), 14.5.3 Validate HTTP Request Header Requirements (L1 L2 L3)
[9] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[10] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration
[11] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration
[12] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration
[13] Standards Mapping - Payment Card Industry Data Security Standard Version 3.0 Requirement 6.5.6
[14] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1 Requirement 6.5.6
[15] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.6
[16] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.6
[17] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0 Requirement 6.2.4
[18] Standards Mapping - Payment Card Industry Data Security Standard Version 4.0.1 Requirement 6.2.4
[19] Standards Mapping - Payment Card Industry Software Security Framework 1.0 Control Objective 4.2 - Critical Asset Protection
[20] Standards Mapping - Payment Card Industry Software Security Framework 1.1 Control Objective 4.2 - Critical Asset Protection
[21] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective C.3.6 - Web Software Attack Mitigation
[22] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[23] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[24] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[25] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[26] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[27] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[28] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[29] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[30] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[31] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[32] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[33] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[34] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[35] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[36] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-000480 CAT II, APSC-DV-000490 CAT II
[37] Standards Mapping - Web Application Security Consortium Version 2.00 Abuse of Functionality (WASC-42)
desc.structural.python.html5_insecure_cross_origin_opener_policy