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Debian 11: DLA-4155-1 High: libapache2-mod-auth-openidc DoS

debian lts
Calendar Grey May 8, 2025
Dist Debian Esm H88
Debian LTS has released a security patch addressing a denial of service flaw in the mod_auth_openidc module of Apache, which manages OpenID Connect authentication.
A vulnerability has been fixed in mod_auth_openidc, an OpenID Certified authentication and authorization module for the Apache 2.x HTTP server that implements the OpenID Connect Re...
Topics%20covered

Topics Covered

security advisory denial of service update debian apache authentication

Summary

An unauthenticated attacker can crash the Apache httpd process by sending
a POST request without a Content-Type header when OIDCPreservePost is
enabled in mod_auth_openidc. This leads to denial of service.

A workaround is to disable the OIDCPreservePost directive.

For Debian 11 bullseye, this problem has been fixed in version
2.4.9.4-0+deb11u6.

We recommend that you upgrade your libapache2-mod-auth-openidc packages.

For the detailed security status of libapache2-mod-auth-openidc please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/libapache2-mod-auth-openidc

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS


Package: libapache2-mod-auth-openidc
Version: 2.4.9.4-0+deb11u6
CVE ID: CVE-2025-3891
Debian Bug: 1104484

Topics%20covered

Topics Covered

security advisory denial of service update debian apache authentication

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