CVE-2024-24814: Denial of service when manipulating mod_auth_openidc_session_chunks cookie in mod_auth_openidc

First published: Tue Feb 13 2024(Updated: )

mod_auth_openidc is an OpenID Certified™ authentication and authorization module for the Apache 2.x HTTP server that implements the OpenID Connect Relying Party functionality. In affected versions missing input validation on mod_auth_openidc_session_chunks cookie value makes the server vulnerable to a denial of service (DoS) attack. An internal security audit has been conducted and the reviewers found that if they manipulated the value of the mod_auth_openidc_session_chunks cookie to a very large integer, like 99999999, the server struggles with the request for a long time and finally gets back with a 500 error. Making a few requests of this kind caused our server to become unresponsive. Attackers can craft requests that would make the server work very hard (and possibly become unresponsive) and/or crash with minimal effort. This issue has been addressed in version 2.4.15.2. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Credit: security-advisories@github.com

Affected Software	Affected Version	How to fix
Openidc Mod Auth Openidc	>=2.0.0<=2.4.15.1
Debian Debian Linux	=10.0
Fedoraproject Fedora	=39
redhat/mod_auth_openidc	<2.4.15.2	2.4.15.2

Remedy

https://github.com/OpenIDC/mod_auth_openidc/commit/4022c12f314bd89d127d1be008b1a80a08e1203d

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