CVE-2024-24814 Affecting mod_auth_openidc package, versions <0:2.4.10-1.el9

Note: Versions mentioned in the description apply only to the upstream mod_auth_openidc package and not the mod_auth_openidc package as distributed by AlmaLinux. See How to fix? for AlmaLinux:9 relevant fixed versions and status.

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.

• https://errata.almalinux.org/8/ALSA-2024-5289.html
• https://errata.almalinux.org/9/ALSA-2024-9180.html
• https://access.redhat.com/security/cve/CVE-2024-24814
• https://access.redhat.com/errata/RHSA-2024:5289
• https://access.redhat.com/errata/RHSA-2024:9180
• https://github.com/OpenIDC/mod_auth_openidc/commit/4022c12f314bd89d127d1be008b1a80a08e1203d
• https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-hxr6-w4gc-7vvv
• https://lists.debian.org/debian-lts-announce/2024/03/msg00004.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T7DKVEVREYAI4F46CQAVOTPL75WLOZOE/