界: Security Features

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WCF Misconfiguration: Weak Class Reference

C#/VB.NET/ASP.NET

Abstract

程式會使用安全性較弱的類別參照，這樣可能會允許攻擊者執行未授權的程式碼。

Explanation

程式會參照未唯一識別的使用者定義類別。.NET 載入這種未安全識別的類別時，CLR 類型載入器會以指定的順序在下列位置中搜尋類別：

- 如果該類型的組件是已知組件，載入器便會搜尋組態設定檔案的重新導向位置、GAC、目前使用組態資訊的組件，以及應用程式基本目錄。

- 如果組件未知，則載入器會搜尋目前的組件、mscorlib，以及由 TypeResolve 事件處理常式所回傳的位置。

此 CLR 搜尋順序可以使用陷阱來修改，例如 Type Forwarding 機制和 AppDomain.TypeResolve 事件。

如果攻擊者透過建立含有相同名稱的替代類別，並將該類別放置在 CLR 會先載入的替代位置，來攻擊 CLR 搜尋順序，CLR 便會無意間執行攻擊者提供的程式碼。

範例 1：以下 WCF 組態設定檔案的 <behaviorExtensions/> 元素會指示 WCF 將自訂行為類別加入特定的 WCF 延伸中。


<system.serviceModel>
    <extensions>
        <behaviorExtensions>
            <add name="myBehavior" type="MyBehavior" />
       </behaviorExtensions>
    </extensions>
</system.serviceModel>

References

[1] Microsoft Developer Network (MSDN)

[2] Standards Mapping - Common Weakness Enumeration CWE ID 95

[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-002754

[9] Standards Mapping - FIPS200 SI

[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 API 2023 API8 Security Misconfiguration

[14] Standards Mapping - OWASP Application Security Verification Standard 4.0 5.2.4 Sanitization and Sandboxing Requirements (L1 L2 L3), 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 M5 Poor Authorization and Authentication

[16] Standards Mapping - OWASP Top 10 2004 A6 Injection Flaws

[17] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws

[18] Standards Mapping - OWASP Top 10 2010 A1 Injection

[19] Standards Mapping - OWASP Top 10 2013 A1 Injection

[20] Standards Mapping - OWASP Top 10 2017 A1 Injection

[21] Standards Mapping - OWASP Top 10 2021 A03 Injection

[22] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.6

[23] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2

[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 - SANS Top 25 2009 Insecure Interaction - CWE ID 116

[35] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I, APP3570 CAT I

[36] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I, APP3570 CAT I

[37] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I, APP3570 CAT I

[38] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I, APP3570 CAT I

[39] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I, APP3570 CAT I

[40] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I, APP3570 CAT I

[41] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I, APP3570 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-002560 CAT I

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

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