Debian dla-4155 : libapache2-mod-auth-openidc - security update

medium Nessus Plugin ID 235597

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Synopsis

The remote Debian host is missing a security-related update.

Description

The remote Debian 11 host has a package installed that is affected by a vulnerability as referenced in the dla-4155 advisory.

- ------------------------------------------------------------------------- Debian LTS Advisory DLA-4155-1 [email protected] https://www.debian.org/lts/security/ Moritz Schlarb May 08, 2025 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

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 Relying Party functionality.

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/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

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade the libapache2-mod-auth-openidc packages.

Plugin Details

Severity: Medium

ID: 235597

File Name: debian_DLA-4155.nasl

Version: 1.1

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 5/8/2025

Updated: 5/8/2025

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.2

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2025-3891

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:libapache2-mod-auth-openidc

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 5/8/2025

Vulnerability Publication Date: 4/17/2025

Reference Information

CVE: CVE-2025-3891

Detections

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