Kingdom: Input Validation and Representation
Input validation and representation problems ares caused by metacharacters, alternate encodings and numeric representations. Security problems result from trusting input. The issues include: "Buffer Overflows," "Cross-Site Scripting" attacks, "SQL Injection," and many others.
Expression Language Injection: Spring
Abstract
The evaluation of unvalidated SpEL expressions can lead to remote code execution.
Explanation
The Spring Expression Language (SpEL for short) is a powerful expression language that supports querying and manipulating an object graph at runtime. The language syntax is similar to Unified EL but offers additional features, most notably method invocation and basic string templating functionality.
Allowing unvalidated expressions to be evaluated will let an attacker execute arbitrary code.
Example 1: The application uses unvalidated data controlled by the user to create and evaluate a SpEL expression:
Allowing unvalidated expressions to be evaluated will let an attacker execute arbitrary code.
Example 1: The application uses unvalidated data controlled by the user to create and evaluate a SpEL expression:
Example 2: The application uses unvalidated data controlled by the user in a Spring tag that perfoms double SpEL evaluation:
String expression = request.getParameter("input");
SpelExpressionParser parser = new SpelExpressionParser();
SpelExpression expr = parser.parseRaw(expression);
<spring:message text="" code="${param['message']}"></spring:message>
References
[1] Dan Amodio Remote Code with Expression Language Injection
[2] Expression Language Injection OWASP
[3] CVE-2011-2730 Red Hat
[4] Standards Mapping - Common Weakness Enumeration CWE ID 94, CWE ID 95, CWE ID 917
[5] Standards Mapping - Common Weakness Enumeration Top 25 2019 [18] CWE ID 094
[6] Standards Mapping - Common Weakness Enumeration Top 25 2020 [17] CWE ID 094
[7] Standards Mapping - Common Weakness Enumeration Top 25 2021 [25] CWE ID 077
[8] Standards Mapping - Common Weakness Enumeration Top 25 2022 [17] CWE ID 077, [25] CWE ID 094
[9] Standards Mapping - Common Weakness Enumeration Top 25 2023 [16] CWE ID 077, [23] CWE ID 094
[10] Standards Mapping - Common Weakness Enumeration Top 25 2024 [11] CWE ID 094, [13] CWE ID 077
[11] Standards Mapping - DISA Control Correlation Identifier Version 2 CCI-002754
[12] Standards Mapping - FIPS200 SI
[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 5.2.4 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)
[17] Standards Mapping - OWASP Mobile 2014 M1 Weak Server Side Controls
[18] Standards Mapping - OWASP Mobile 2024 M4 Insufficient Input/Output Validation
[19] Standards Mapping - OWASP Top 10 2004 A6 Injection Flaws
[20] Standards Mapping - OWASP Top 10 2007 A2 Injection Flaws
[21] Standards Mapping - OWASP Top 10 2010 A1 Injection
[22] Standards Mapping - OWASP Top 10 2013 A1 Injection
[23] Standards Mapping - OWASP Top 10 2017 A1 Injection
[24] Standards Mapping - OWASP Top 10 2021 A03 Injection
[25] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 Requirement 6.5.6
[26] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 Requirement 6.3.1.1, Requirement 6.5.2
[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 6.5.1
[30] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2 Requirement 6.5.1
[31] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1 Requirement 6.5.1
[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 - SANS Top 25 2009 Risky Resource Management - CWE ID 094
[38] Standards Mapping - Security Technical Implementation Guide Version 3.1 APP3510 CAT I, APP3570 CAT I
[39] Standards Mapping - Security Technical Implementation Guide Version 3.4 APP3510 CAT I, APP3570 CAT I
[40] Standards Mapping - Security Technical Implementation Guide Version 3.5 APP3510 CAT I, APP3570 CAT I
[41] Standards Mapping - Security Technical Implementation Guide Version 3.6 APP3510 CAT I, APP3570 CAT I
[42] Standards Mapping - Security Technical Implementation Guide Version 3.7 APP3510 CAT I, APP3570 CAT I
[43] Standards Mapping - Security Technical Implementation Guide Version 3.9 APP3510 CAT I, APP3570 CAT I
[44] Standards Mapping - Security Technical Implementation Guide Version 3.10 APP3510 CAT I, APP3570 CAT I
[45] Standards Mapping - Security Technical Implementation Guide Version 4.2 APSC-DV-002560 CAT I
[46] Standards Mapping - Security Technical Implementation Guide Version 4.3 APSC-DV-002560 CAT I
[47] Standards Mapping - Security Technical Implementation Guide Version 4.4 APSC-DV-002560 CAT I
[48] Standards Mapping - Security Technical Implementation Guide Version 4.5 APSC-DV-002560 CAT I
[49] Standards Mapping - Security Technical Implementation Guide Version 4.6 APSC-DV-002560 CAT I
[50] Standards Mapping - Security Technical Implementation Guide Version 4.7 APSC-DV-002560 CAT I
[51] Standards Mapping - Security Technical Implementation Guide Version 4.8 APSC-DV-002560 CAT I
[52] Standards Mapping - Security Technical Implementation Guide Version 4.9 APSC-DV-002560 CAT I
[53] Standards Mapping - Security Technical Implementation Guide Version 4.10 APSC-DV-002560 CAT I
[54] Standards Mapping - Security Technical Implementation Guide Version 4.11 APSC-DV-002560 CAT I
[55] Standards Mapping - Security Technical Implementation Guide Version 4.1 APSC-DV-002560 CAT I
[56] Standards Mapping - Security Technical Implementation Guide Version 5.1 APSC-DV-002560 CAT I
[57] Standards Mapping - Security Technical Implementation Guide Version 5.2 APSC-DV-002560 CAT I
[58] Standards Mapping - Security Technical Implementation Guide Version 5.3 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[59] Standards Mapping - Security Technical Implementation Guide Version 6.1 APSC-DV-002530 CAT II, APSC-DV-002560 CAT I
[60] Standards Mapping - Web Application Security Consortium Version 2.00 Improper Input Handling (WASC-20)
desc.dataflow.java.expression_language_injection_spring