mod_auth_openidc is an authentication and authorization module for the Apache 2.x HTTP server that implements the OpenID Connect Relying Party functionality. In versions 2.0.0 through 2.4.13.1, when OIDCStripCookies is set and a crafted cookie supplied, a NULL pointer dereference would occur, resulting in a segmentation fault. This could be used in a Denial-of-Service attack and thus presents an availability risk. Version 2.4.13.2 contains a patch for this issue. As a workaround, avoid using OIDCStripCookies.
Weakness
The product dereferences a pointer that it expects to be valid but is NULL.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Mod_auth_openidc | Openidc | 2.0.0 (including) | 2.4.13.2 (excluding) |
| Red Hat Enterprise Linux 8 | RedHat | mod_auth_openidc:2.3-8090020230721123832.b46abd14 | * |
| Red Hat Enterprise Linux 9 | RedHat | mod_auth_openidc-0:2.4.9.4-4.el9 | * |
| Libapache2-mod-auth-openidc | Ubuntu | bionic | * |
| Libapache2-mod-auth-openidc | Ubuntu | esm-apps/bionic | * |
| Libapache2-mod-auth-openidc | Ubuntu | esm-apps/focal | * |
| Libapache2-mod-auth-openidc | Ubuntu | esm-apps/jammy | * |
| Libapache2-mod-auth-openidc | Ubuntu | focal | * |
| Libapache2-mod-auth-openidc | Ubuntu | jammy | * |
| Libapache2-mod-auth-openidc | Ubuntu | kinetic | * |
| Libapache2-mod-auth-openidc | Ubuntu | lunar | * |
| Libapache2-mod-auth-openidc | Ubuntu | mantic | * |
| Libapache2-mod-auth-openidc | Ubuntu | trusty | * |
| Libapache2-mod-auth-openidc | Ubuntu | upstream | * |
| Libapache2-mod-auth-openidc | Ubuntu | xenial | * |
Potential Mitigations
References
- https://github.com/OpenIDC/mod_auth_openidc/blame/3f11976dab56af0a46a7dddb7a275cc16d6eb726/src/mod_auth_openidc.c#L178-L179
- https://github.com/OpenIDC/mod_auth_openidc/commit/c0e1edac3c4c19988ccdc7713d7aebfce6ff916a
- https://github.com/OpenIDC/mod_auth_openidc/releases/tag/v2.4.13.2
- https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-f5xw-rvfr-24qr
- https://lists.debian.org/debian-lts-announce/2023/04/msg00034.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WIBKFC22PDH6UXMSZ23PHTD7736ZC7BB/
- https://www.debian.org/security/2023/dsa-5405
- https://github.com/OpenIDC/mod_auth_openidc/blame/3f11976dab56af0a46a7dddb7a275cc16d6eb726/src/mod_auth_openidc.c#L178-L179
- https://github.com/OpenIDC/mod_auth_openidc/commit/c0e1edac3c4c19988ccdc7713d7aebfce6ff916a
- https://github.com/OpenIDC/mod_auth_openidc/releases/tag/v2.4.13.2
- https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-f5xw-rvfr-24qr
- https://lists.debian.org/debian-lts-announce/2023/04/msg00034.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WIBKFC22PDH6UXMSZ23PHTD7736ZC7BB/
- https://www.debian.org/security/2023/dsa-5405