CVE-2022-39958 : Security Advisory and Response

A detailed insight into the vulnerability affecting the OWASP ModSecurity Core Rule Set (CRS) and the necessary steps to secure systems.

Understanding CVE-2022-39958

This section outlines the impact, technical details, and mitigation strategies related to CVE-2022-39958.

What is CVE-2022-39958?

The OWASP ModSecurity Core Rule Set (CRS) faces a response body bypass vulnerability allowing the sequential exfiltration of small data sections by manipulating HTTP Range headers.

The Impact of CVE-2022-39958

The vulnerability enables malicious actors to evade detection and access restricted resources, posing a threat even within protected environments leveraging CRS.

Technical Details of CVE-2022-39958

Explore the specifics of the vulnerability affecting OWASP ModSecurity Core Rule Set.

Vulnerability Description

The flaw permits the extraction of small and undetectable data segments by iterating through HTTP Range header submissions.

Affected Systems and Versions

Versions 3.0.x, 3.1.x, 3.2.1, and 3.3.2 of the CRS are vulnerable, emphasizing the necessity of upgrading to versions 3.2.2 and 3.3.3.

Exploitation Mechanism

By repeatedly sending HTTP Range header fields with reduced byte ranges, threat actors can bypass pattern matching techniques, gaining unauthorized resource access.

Mitigation and Prevention

Discover the immediate and long-term measures to mitigate the risks associated with CVE-2022-39958.

Immediate Steps to Take

Integrators and users are advised to upgrade to CRS versions 3.2.2 and 3.3.3 promptly and set a minimum CRS paranoia level of 3.

Long-Term Security Practices

Regularly monitor for updates from OWASP and configure security controls to enhance detection capabilities and prevent similar exploits.

Patching and Updates

Stay informed about security advisories and promptly install patches to ensure systems remain protected from evolving threats.