界: Input Validation and Representation

輸入驗證和表示法問題是由中繼字元、替代編碼和數值表示法引起的。信任輸入會導致安全問題。問題包括：「Buffer Overflows」、「Cross-Site Scripting」攻擊、「SQL Injection」及其他許多問題。

Dynamic Code Evaluation: XMLDecoder Injection

Java/JSP

Abstract

在執行期間還原序列化使用者所控制的 XML 文件，可讓攻擊者在伺服器上執行惡意的任意程式碼。

Explanation

JDK XMLEncoder 與 XMLDecoder 類別能為開發人員提供輕鬆方式以保留物件，同時將其序列化為 XML 文件。但是，XMLEncoder 也允許開發人員序列化方法呼叫，若攻擊者能提供將要由 XMLDecoder 還原序列化的 XML 文件，則能夠在伺服器上執行任意程式碼。

範例 1：以下 Java 程式碼顯示了處理不可信賴輸入的 XMLDecoder 執行個體。


  XMLDecoder decoder = new XMLDecoder(new InputSource(new InputStreamReader(request.getInputStream(), "UTF-8")));

  Object object = decoder.readObject();
  decoder.close();

範例 1：以下 XML 文件將個體化 ProcessBuilder 物件，並叫用其靜態 start() 方法以執行 Windows 小算盤。


  <java>
    <object class="java.lang.ProcessBuilder">
      <array class="java.lang.String" length="1" >
        <void index="0">
          <string>c:\\windows\\system32\\calc.exe</string>
        </void>
      </array>
      <void method="start"/>
    </object>
  </java>

References

[1] Oracle Oracle official documentation for XMLDecoder

[2] Standards Mapping - Common Weakness Enumeration CWE ID 502

[3] Standards Mapping - Common Weakness Enumeration Top 25 2019 [23] CWE ID 502

[4] Standards Mapping - Common Weakness Enumeration Top 25 2020 [21] CWE ID 502

[5] Standards Mapping - Common Weakness Enumeration Top 25 2021 [13] CWE ID 502

[6] Standards Mapping - Common Weakness Enumeration Top 25 2022 [12] CWE ID 502

[7] Standards Mapping - Common Weakness Enumeration Top 25 2023 [15] CWE ID 502

[8] Standards Mapping - Common Weakness Enumeration Top 25 2024 [16] CWE ID 502

[9] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-001310, CCI-001764, CCI-001774, CCI-002754

[10] Standards Mapping - FIPS200 SI

[11] Standards Mapping - General Data Protection Regulation (GDPR) Indirect Access to Sensitive Data

[12] Standards Mapping - NIST Special Publication 800-53 Revision 4 CM-7 Least Functionality (P1), SI-10 Information Input Validation (P1)

[13] Standards Mapping - NIST Special Publication 800-53 Revision 5 CM-7 Least Functionality, SI-10 Information Input Validation

[14] Standards Mapping - OWASP Application Security Verification Standard 4.0 1.5.2 Input and Output Architectural Requirements (L2 L3), 5.5.1 Deserialization Prevention Requirements (L1 L2 L3), 5.5.3 Deserialization Prevention Requirements (L1 L2 L3)

[15] Standards Mapping - OWASP Mobile 2014 M7 Client Side Injection

[16] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation

[17] Standards Mapping - OWASP Mobile Application Security Verification Standard 2.0 MASVS-CODE-4

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

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

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

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

[22] Standards Mapping - OWASP Top 10 2017 A8 Insecure Deserialization

[23] Standards Mapping - OWASP Top 10 2021 A08 Software and Data Integrity Failures

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

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

[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 6.5.1

[29] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1

[30] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1

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

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

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

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

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

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

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

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

[44] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-001480 CAT II, APSC-DV-001490 CAT II, APSC-DV-002550 CAT I, APSC-DV-002560 CAT I

[45] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-001480 CAT II, APSC-DV-001490 CAT II, APSC-DV-002550 CAT I, APSC-DV-002560 CAT I

[46] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-001480 CAT II, APSC-DV-001490 CAT II, APSC-DV-002550 CAT I, APSC-DV-002560 CAT I

[47] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-001480 CAT II, APSC-DV-001490 CAT II, APSC-DV-002550 CAT I, APSC-DV-002560 CAT I

[48] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-001480 CAT II, APSC-DV-001490 CAT II, APSC-DV-002550 CAT I, APSC-DV-002560 CAT I

[49] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-001480 CAT II, APSC-DV-001490 CAT II, APSC-DV-002550 CAT I, APSC-DV-002560 CAT I

[50] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-001480 CAT II, APSC-DV-001490 CAT II, APSC-DV-002550 CAT I, APSC-DV-002560 CAT I

[51] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-001480 CAT II, APSC-DV-001490 CAT II, APSC-DV-002550 CAT I, APSC-DV-002560 CAT I

[52] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-001480 CAT II, APSC-DV-001490 CAT II, APSC-DV-002550 CAT I, APSC-DV-002560 CAT I

[53] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-001480 CAT II, APSC-DV-001490 CAT II, APSC-DV-002550 CAT I, APSC-DV-002560 CAT I

[54] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-001480 CAT II, APSC-DV-001490 CAT II, APSC-DV-002550 CAT I, APSC-DV-002560 CAT I

[55] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-001480 CAT II, APSC-DV-001490 CAT II, APSC-DV-002550 CAT I, APSC-DV-002560 CAT I

[56] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-001480 CAT II, APSC-DV-001490 CAT II, APSC-DV-002550 CAT I, APSC-DV-002560 CAT I

[57] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-001480 CAT II, APSC-DV-001490 CAT II, APSC-DV-002530 CAT II, APSC-DV-002550 CAT I, APSC-DV-002560 CAT I

[58] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-001480 CAT II, APSC-DV-001490 CAT II, APSC-DV-002530 CAT II, APSC-DV-002550 CAT I, APSC-DV-002560 CAT I

[59] Standards Mapping - Web Application Security Consortium Version 2.00 Improper Input Handling (WASC-20)

desc.dataflow.java.dynamic_code_evaluation_xmldecoder_injection