Authentication Bypass by Primary Weakness Affecting mod_auth_mellon-diagnostics package, versions <0:0.14.0-2.el7_6.4
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL7-MODAUTHMELLONDIAGNOSTICS-4905282
- published26 Jul 2021
- disclosed10 May 2018
Introduced: 10 May 2018
CVE-2019-3878 (opens in a new tab)How to fix?
Upgrade RHEL:7 mod_auth_mellon-diagnostics to version 0:0.14.0-2.el7_6.4 or higher.
This issue was patched in RHSA-2019:0766.
NVD Description
Note: Versions mentioned in the description apply only to the upstream mod_auth_mellon-diagnostics package and not the mod_auth_mellon-diagnostics package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
A vulnerability was found in mod_auth_mellon before v0.14.2. If Apache is configured as a reverse proxy and mod_auth_mellon is configured to only let through authenticated users (with the require valid-user directive), adding special HTTP headers that are normally used to start the special SAML ECP (non-browser based) can be used to bypass authentication.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3878
- https://github.com/Uninett/mod_auth_mellon/pull/196
- https://access.redhat.com/security/cve/CVE-2019-3878
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CNW5YMC5TLWVWNJEY6AIWNSNPRAMWPQJ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X7NLAU7KROWNTHAYSA2S67X347F42L2I/
- https://access.redhat.com/errata/RHBA-2019:0959
- https://access.redhat.com/errata/RHSA-2019:0766
- https://usn.ubuntu.com/3924-1/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CNW5YMC5TLWVWNJEY6AIWNSNPRAMWPQJ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X7NLAU7KROWNTHAYSA2S67X347F42L2I/