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.
CVSS Details
- CVSS 3.1 Base Score: 7.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade cjose-develUpgrade cjoseUpgrade mod_auth_openidc | Aug 22, 2024 | Feb 13, 2024 |
| Debian | — | Upgrade libapache2-mod-auth-openidc | Mar 7, 2024 | Feb 13, 2024 |
| Oracle_linux | — | Upgrade cjose-develUpgrade mod_auth_openidcUpgrade cjose | Oct 16, 2024 | Feb 13, 2024 |
| Redhat_linux | — | No solution existsUpgrade mod_auth_openidcUpgrade mod_auth_openidc-debuginfoUpgrade mod_auth_openidc-debugsource | Sep 13, 2024 | Feb 13, 2024 |
| Rocky_linux | — | Upgrade mod_auth_openidcUpgrade cjose-develUpgrade cjose-debugsourceUpgrade cjoseUpgrade mod_auth_openidc-debuginfoUpgrade mod_auth_openidc-debugsourceUpgrade cjose-debuginfo | Mar 18, 2025 | Feb 13, 2024 |
| Suse | — | Upgrade apache2-mod_auth_openidc | Mar 6, 2024 | Feb 13, 2024 |
| Ubuntu | — | No solution exists | Jun 26, 2025 | Feb 13, 2024 |
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