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CVE-2021-39191 Details

Description

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 prior to 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.

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References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://github.com/zmartzone/mod_auth_openidc/commit/03e6bfb446f4e3f27c003d30d6a433e5dd8e2b3d CVEPatchThird Party Advisory
https://github.com/zmartzone/mod_auth_openidc/issues/672 CVEExploit
https://github.com/zmartzone/mod_auth_openidc/releases/tag/v2.4.9.4 CVERelease Notes
https://github.com/zmartzone/mod_auth_openidc/security/advisories/GHSA-2pgf-8h6h-gqg2 CVEVendor Advisory
https://lists.debian.org/debian-lts-announce/2023/07/msg00020.html CVEMailing List

see all 14 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-601URL Redirection to Untrusted Site ('Open Redirect')[email protected]
CWE-601URL Redirection to Untrusted Site ('Open Redirect')[email protected]

Affected Products

ProductVersions
openidc mod auth openidc
< 2.4.9.4

CPE

  • cpe:2.3:a:openidc:mod_auth_openidc:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
fedoraproject fedora
35
36

CPE

  • cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
  • cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
debian debian linux
10.0

CPE

  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

12 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2021-39191
NVD Published Date:
Sep 3, 2021
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2021-39191 Details - Not Deferred