CVE-2023-38199

Summary

CVE-2023-38199 affects coreruleset, also known as OWASP ModSecurity Core Rule Set, up to version 3.3.4. This vulnerability allows attackers to bypass a web application firewall (WAF) by sending multiple Content-Type headers in a request. The WAF fails to detect the additional headers on certain platforms, enabling attackers to manipulate the application with crafted payloads. This issue, called "Content-Type confusion," arises when the application relies solely on the last Content-Type header, while other platforms either reject or merge conflicting headers, leading to malformed header detection.

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