CVE-2024-43204

A Server-side request forgery (SSRF) vulnerability exists in Apache httpd when the server has mod_proxy loaded and is configured with mod_headers to modify the Content-Type header in the HTTP request or response using a value supplied by the user. Under this configuration, this flaw allows an attacker to craft specially crafted requests to manipulate the Content-Type header and trigger outbound requests to arbitrary attacker-controlled URLs via proxy. The vulnerability stems from inadequate input validation and unsafe header manipulation, ultimately allowing an attacker to influence server-side network behavior.

Exploitation requires a non-default and uncommon server configuration where mod_headers is configured to modify the Content-Type request or a response header with a value provided in the HTTP request.

This issue is rated as a Moderate vulnerability primarily due to its reliance on a non-default and uncommon server configuration, which significantly limits its exploitability. Specifically, successful exploitation requires the Apache HTTP Server to have both mod_proxy and mod_headers enabled, and for mod_headers to be explicitly misconfigured to set or modify the Content-Type header using unvalidated user input—a rare and generally discouraged setup. Moreover, the SSRF does not result in information disclosure, privilege escalation, or code execution, but merely allows outbound connections from the server to attacker-controlled endpoints.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.