Arbitrary Code Execution in gray-matter via JavaScript Engine

Executive Summary

This vulnerability in gray-matter versions up to 4.0.3 allows arbitrary code execution due to the use of eval() in lib/engines.js when parsing front matter with a language set to js or javascript.

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Detection Guidance

This vulnerability involves arbitrary code execution via eval() in gray-matter when parsing front matter with js/javascript language. To detect it, inspect applications using gray-matter for front matter parsing with JavaScript engine. Check for unexpected or suspicious code execution in logs or system behavior. No specific commands are provided in the context.

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Impact Analysis

An attacker could exploit this to execute malicious JavaScript code on your system if you process untrusted input with gray-matter, potentially leading to data theft, system compromise, or further attacks.

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Compliance Impact

This vulnerability could lead to unauthorized data access or processing, violating GDPR's data protection principles or HIPAA's security requirements for protected health information.

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Mitigation Strategies

Immediately stop using gray-matter library versions affected by this issue. Update to the latest patched version if available. Review any applications using gray-matter to ensure they do not parse untrusted input with JavaScript front matter.

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