Published: 03/09/2021 Updated: 07/11/2023

CVSS v2 Base Score: 5.8 | Impact Score: 4.9 | Exploitability Score: 8.6

CVSS v3 Base Score: 6.1 | Impact Score: 2.7 | Exploitability Score: 2.8

VMScore: 516

Vector: AV:N/AC:M/Au:N/C:P/I:P/A:N

mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In versions before 2.4.9.4, the 3rd-party init SSO functionality of mod_auth_openidc was reported to be vulnerable to an open redirect attack by supplying a crafted URL in the `target_link_uri` parameter. A patch in version 2.4.9.4 made it so that the `OIDCRedirectURLsAllowed` setting must be applied to the `target_link_uri` parameter. There are no known workarounds aside from upgrading to a patched version.

Vulnerable Product	Search on Vulmon	Subscribe to Product
openidc mod auth openidc
fedoraproject fedora 35
fedoraproject fedora 36
debian debian linux 10.0

Debian Bug report logs - #993648 libapache2-mod-auth-openidc: CVE-2021-39191 Package: src:libapache2-mod-auth-openidc; Maintainer for src:libapache2-mod-auth-openidc is Moritz Schlarb <schlarbm@uni-mainzde>; Reported by: Salvatore Bonaccorso <carnil@debianorg> Date: Sat, 4 Sep 2021 08:09:01 UTC Severity: important ...

mod_auth_openidc is an authentication/authorization module for the Apache 2x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider In versions prior to 2494, the 3rd-party init SSO functionality of mod_auth_openidc was reported to be vulnerable to an open redirect attack by suppl ...

CWE-601 https://github.com/zmartzone/mod_auth_openidc/issues/672 https://github.com/zmartzone/mod_auth_openidc/commit/03e6bfb446f4e3f27c003d30d6a433e5dd8e2b3d https://github.com/zmartzone/mod_auth_openidc/releases/tag/v2.4.9.4 https://github.com/zmartzone/mod_auth_openidc/security/advisories/GHSA-2pgf-8h6h-gqg2 https://lists.debian.org/debian-lts-announce/2023/07/msg00020.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/32RGPW5LZDLDTB7MKZIGAHPSLFOUNWR5/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RHXO4O4G2UQS7X6OQJCVZKHZAQ7SAIFB/https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=993648 https://nvd.nist.gov

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CVE-2021-39191

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