CVE-2023-28625 — mod_auth_openidc is an authentication and authorization module for the Apache 2

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 dereferen

01What is this vulnerability?

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…

02Affected products

Vendor	Product	Versions
OpenIDC	mod_auth_openidc	>= 2.0.0, < 2.4.13.2

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-04-03T13:19:40.422Z
• Last modified: 2025-02-13T16:48:46.211Z

09References

• github.com — https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-f5xw-rvfr-2…
• github.com — https://github.com/OpenIDC/mod_auth_openidc/commit/c0e1edac3c4c19988ccdc7713d7ae…
• github.com — https://github.com/OpenIDC/mod_auth_openidc/blame/3f11976dab56af0a46a7dddb7a275c…
• github.com — https://github.com/OpenIDC/mod_auth_openidc/releases/tag/v2.4.13.2
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2023/04/msg00034.html
• www.debian.org — https://www.debian.org/security/2023/dsa-5405
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/[email protected]…