5.9

CVSS Score

4.0

-

CVSS Score

Basic Information

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CVE-2024-12798

CVE-2024-12798: QOS.CH logback-core Expression Language Injection vulnerability

ACE vulnerability in JaninoEventEvaluator by QOS.CH logback-core up to and including version 1.5.12 in Java applications allows attackers to execute arbitrary code by compromising an existing logback configuration file or by injecting an environment variable before program execution.

Malicious logback configuration files can allow the attacker to execute arbitrary code using the JaninoEventEvaluator extension.

A successful attack requires the user to have write access to a configuration file. Alternatively, the attacker could inject a malicious environment variable pointing to a malicious configuration file. In both cases, the attack requires existing privilege.

(GitHub Advisory)

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CVE-2024-12798

CVE-2024-12798:

5.9

CVSS Score

4.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
ch.qos.logback:logback-core	maven	>= 1.4.0, < 1.5.13	1.5.13
ch.qos.logback:logback-core	maven	< 1.3.15	1.3.15

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability is an Expression Language Injection in JaninoEventEvaluator. The provided commit 2cb6d520df7592ef1c3a198f1b5df3c10c93e183 completely removes the JaninoEventEvaluator and its base class JaninoEventEvaluatorBase, along with related test files and configuration helpers like ClassicEvaluatorAction. This removal is a direct mitigation of the vulnerability. The core of the vulnerability lies in how these classes handle and evaluate expressions using the Janino library.

JaninoEventEvaluatorBase.setExpression(String expression): This method would receive the potentially malicious expression from the logback configuration.
JaninoEventEvaluator.getDecoratedExpression(): This method in the derived class would further process this expression.
JaninoEventEvaluatorBase.start(): This method would then take the expression and initialize/compile it using Janino's ScriptEvaluator.
JaninoEventEvaluatorBase.evaluate(E event): This method is the sink where the compiled, potentially malicious, expression is executed, leading to arbitrary code execution.

The ClassicEvaluatorAction.defaultClassName() method is included because it directly facilitated the use of the vulnerable JaninoEventEvaluator by returning its class name for instantiation within the Joran configuration framework.

The patch evidence clearly shows these classes and their methods being removed, indicating they were central to the vulnerable functionality. The confidence is high for the methods directly involved in expression handling and evaluation, and medium for the helper action class.

Vulnerable functions

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WAF Rule

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Reasoning

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