Vulnerability Details CVE-2021-39191
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 56.5%
CVSS Severity
CVSS v3 Score 4.7
CVSS v2 Score 5.8
References
- https://github.com/zmartzone/mod_auth_openidc/commit/03e6bfb446f4e3f27c003d30d6a433e5dd8e2b3d
- https://github.com/zmartzone/mod_auth_openidc/issues/672
- 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://github.com/zmartzone/mod_auth_openidc/commit/03e6bfb446f4e3f27c003d30d6a433e5dd8e2b3d
- https://github.com/zmartzone/mod_auth_openidc/issues/672
- 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/
Products affected by CVE-2021-39191
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cpe:2.3:a:openidc:mod_auth_openidc:-
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cpe:2.3:a:openidc:mod_auth_openidc:1.5
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cpe:2.3:a:openidc:mod_auth_openidc:1.5.1
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cpe:2.3:a:openidc:mod_auth_openidc:1.5.2
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cpe:2.3:a:openidc:mod_auth_openidc:1.5.3
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cpe:2.3:a:openidc:mod_auth_openidc:1.5.4
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cpe:2.3:a:openidc:mod_auth_openidc:1.5.5
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cpe:2.3:a:openidc:mod_auth_openidc:1.6.0
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cpe:2.3:a:openidc:mod_auth_openidc:1.7.0
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cpe:2.3:a:openidc:mod_auth_openidc:1.7.1
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cpe:2.3:a:openidc:mod_auth_openidc:1.7.2
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cpe:2.3:a:openidc:mod_auth_openidc:1.7.3
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cpe:2.3:a:openidc:mod_auth_openidc:1.8.0
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cpe:2.3:a:openidc:mod_auth_openidc:1.8.1
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cpe:2.3:a:openidc:mod_auth_openidc:1.8.10
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cpe:2.3:a:openidc:mod_auth_openidc:1.8.10.1
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cpe:2.3:a:openidc:mod_auth_openidc:1.8.10.2
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cpe:2.3:a:openidc:mod_auth_openidc:1.8.10.3
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cpe:2.3:a:openidc:mod_auth_openidc:1.8.2
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cpe:2.3:a:openidc:mod_auth_openidc:1.8.3
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cpe:2.3:a:openidc:mod_auth_openidc:1.8.4
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cpe:2.3:a:openidc:mod_auth_openidc:1.8.5
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cpe:2.3:a:openidc:mod_auth_openidc:1.8.6
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cpe:2.3:a:openidc:mod_auth_openidc:1.8.7
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cpe:2.3:a:openidc:mod_auth_openidc:1.8.8
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cpe:2.3:a:openidc:mod_auth_openidc:1.8.9
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cpe:2.3:a:openidc:mod_auth_openidc:2.0.0
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cpe:2.3:a:openidc:mod_auth_openidc:2.1.0
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cpe:2.3:a:openidc:mod_auth_openidc:2.1.1
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cpe:2.3:a:openidc:mod_auth_openidc:2.1.13
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cpe:2.3:a:openidc:mod_auth_openidc:2.1.2
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cpe:2.3:a:openidc:mod_auth_openidc:2.1.3
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cpe:2.3:a:openidc:mod_auth_openidc:2.1.4
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cpe:2.3:a:openidc:mod_auth_openidc:2.1.5
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cpe:2.3:a:openidc:mod_auth_openidc:2.1.6
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cpe:2.3:a:openidc:mod_auth_openidc:2.2.0
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cpe:2.3:a:openidc:mod_auth_openidc:2.3.0
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cpe:2.3:a:openidc:mod_auth_openidc:2.3.1
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cpe:2.3:a:openidc:mod_auth_openidc:2.3.10
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cpe:2.3:a:openidc:mod_auth_openidc:2.3.10.1
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cpe:2.3:a:openidc:mod_auth_openidc:2.3.10.2
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cpe:2.3:a:openidc:mod_auth_openidc:2.3.11
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cpe:2.3:a:openidc:mod_auth_openidc:2.3.2
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cpe:2.3:a:openidc:mod_auth_openidc:2.3.3
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cpe:2.3:a:openidc:mod_auth_openidc:2.3.4
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cpe:2.3:a:openidc:mod_auth_openidc:2.3.5
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cpe:2.3:a:openidc:mod_auth_openidc:2.3.6
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cpe:2.3:a:openidc:mod_auth_openidc:2.3.7
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cpe:2.3:a:openidc:mod_auth_openidc:2.3.8
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cpe:2.3:a:openidc:mod_auth_openidc:2.3.9
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.0
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.0.1
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.0.2
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.0.3
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.0.4
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.1
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.2
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.2.1
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.3
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.4
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.4.1
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.5
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.6
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.7
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.7.1
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.7.2
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.8.1
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.8.2
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.8.3
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.8.4
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.9
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.9.1
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.9.2
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cpe:2.3:a:openidc:mod_auth_openidc:2.4.9.3
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cpe:2.3:o:debian:debian_linux:10.0
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cpe:2.3:o:fedoraproject:fedora:35
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cpe:2.3:o:fedoraproject:fedora:36