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ASP.NET Misconfiguration: Unsafe Header Parsing

C#/VB.NET/ASP.NET

Abstract

應用程式設定的屬性會導致 HTTP 剖析期間忽略驗證錯誤。

Explanation

將 useUnsafeHeaderParsing 屬性設定為 true，導致存在不安全的 HTTP 標頭處理。由於有關 HTTP 標頭的驗證規則不足，此設定讓攻擊可以瞄準易受攻擊的應用程式。

將此屬性設定為 true 時，不會執行下列驗證：

- 將 CRLF 使用於行尾程式碼。不允許使用單獨的 CR 或 LF。
- 標頭名稱中沒有空格。
- 除了第一個狀態行之外的所有狀態行都被解讀為錯誤的標頭名稱/值對。
- 狀態行必須包含程式碼和描述。

此設定還意味著將不再拋出有關禁止字元的某些異常。

範例 1：在以下範例中，useUnsafeHeaderParsing 設定為 true。


...
<configuration>
   <system.net>
   <settings>
      <httpWebRequest useUnsafeHeaderParsing="true" />
   </settings>
   </system.net>
</configuration>
...

References

[1] HttpWebRequestElement.UseUnsafeHeaderParsing Property Microsoft

[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 CM

[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 API 2023 API8 Security Misconfiguration

[10] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls

[11] Standards Mapping - OWASP Mobile 2024 M8 Security Misconfiguration

[12] Standards Mapping - OWASP Top 10 2004 A10 Insecure Configuration Management

[13] Standards Mapping - OWASP Top 10 2010 A6 Security Misconfiguration

[14] Standards Mapping - OWASP Top 10 2013 A5 Security Misconfiguration

[15] Standards Mapping - OWASP Top 10 2017 A6 Security Misconfiguration

[16] Standards Mapping - OWASP Top 10 2021 A05 Security Misconfiguration

[17] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.10

[18] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1

[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

[28] Standards Mapping - Payment Card Industry Software Security Framework 1.2 Control Objective 4.2 - Critical Asset Protection, Control Objective C.3.1 - 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-002560 CAT I

[50] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002560 CAT I

[51] Standards Mapping - Web Application Security Consortium Version 2.00 Application Misconfiguration (WASC-15)

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