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.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Mod_auth_openidc | Openidc | 2.0.0 (including) | 2.4.15.1 (including) |
| Red Hat Enterprise Linux 8 | RedHat | mod_auth_openidc:2.3-8100020240516071625.489197e6 | * |
| Red Hat Enterprise Linux 9 | RedHat | mod_auth_openidc-0:2.4.10-1.el9 | * |
| Libapache2-mod-auth-openidc | Ubuntu | bionic | * |
| Libapache2-mod-auth-openidc | Ubuntu | mantic | * |
| Libapache2-mod-auth-openidc | Ubuntu | xenial | * |