What’s Vulnerable › Vulnerabilities
CVE-2023-28625: mod_auth_openidc core dump when OIDCStripCookies is set and an empty Cookie header is supplied
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2023-04-03 · updated 2026-06-17
- Weakness: CWE-476
Description
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`.
Affected products
- OpenIDC mod_auth_openidc: from 2.0.0 before 2.4.13.2 — fixed in 2.4.13.2
How to fix
Upgrade to a fixed version: OpenIDC mod_auth_openidc 2.4.13.2. Check the vendor advisory for 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
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