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TI-2019-02888 Aliases CVE-2019-3878GHSA-6gx9-985p-w8c8

Authentication bypass in uninett mod_auth_mellon

Priority MEDIUM 41CWE-305Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-287.

Summary

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.

Why it matters now

EPSS 0.02969 87th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed mod_auth_mellon (uninett): v0.14.2Red Hat: 3 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
uninettmod_auth_mellonbefore v0.14.2v0.14.2Patch availableCNA
  • mod_auth_mellon Vendoruninett Affected before v0.14.2 Fixed in v0.14.2 Patch available CNA

CPE configurations NVD · 12

CPEVersionsRoleVendor
cpe:2.3:a:mod_auth_mellon_project:mod_auth_mellon:*:*:*:*:*:apache:*:*before 0.14.2VulnerableMod Auth Mellon Project
cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*29VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*30VulnerableFedoraproject
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*7.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*7.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*7.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
  • cpe:2.3:a:mod_auth_mellon_project:mod_auth_mellon:*:*:*:*:*:apache:*:* Versions before 0.14.2 Vulnerable ·Mod Auth Mellon Project
  • cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:* Versions 29 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:* Versions 30 Vulnerable ·Fedoraproject
  • cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
Show 2 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*18.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*18.10VulnerableCanonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:* Versions 18.10 Vulnerable ·Canonical

Remediation

  • Fix · CNA mod_auth_mellon (uninett) Fixed in v0.14.2

Red Hat 3 advisories

  • RHSA-2019:0985 Released 2019-05-07 · Red Hat rating Important
    mod_auth_mellon security update
    • Red Hat Enterprise Linux AppStream (v. 8) mod_auth_mellon-0.14.0-3.el8_0.2
  • RHSA-2019:0766 Released 2019-04-16 · Red Hat rating Important
    mod_auth_mellon security and bug fix update
    • Red Hat Enterprise Linux Server (v. 7) mod_auth_mellon-0.14.0-2.el7_6.4
    • Red Hat Enterprise Linux Server Optional (v. 7) mod_auth_mellon-diagnostics-0.14.0-2.el7_6.4
    • Red Hat Enterprise Linux Workstation (v. 7) mod_auth_mellon-0.14.0-2.el7_6.4
    • Red Hat Enterprise Linux Workstation Optional (v. 7) mod_auth_mellon-diagnostics-0.14.0-2.el7_6.4
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) mod_auth_mellon-0.14.0-2.el7_6.4
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) mod_auth_mellon-diagnostics-0.14.0-2.el7_6.4
  • RHSA-2019:0746 Released 2019-04-11 · Red Hat rating Important
    httpd24-httpd and httpd24-mod_auth_mellon security update
    • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) httpd24-httpd-2.4.34-7.el6.1, httpd24-httpd-devel-2.4.34-7.el6.1, httpd24-httpd-manual-2.4.34-7.el6.1 +5
    • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) httpd24-httpd-2.4.34-7.el7.1, httpd24-httpd-devel-2.4.34-7.el7.1, httpd24-httpd-manual-2.4.34-7.el7.1 +7
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4) httpd24-httpd-2.4.34-7.el7.1, httpd24-httpd-devel-2.4.34-7.el7.1, httpd24-httpd-manual-2.4.34-7.el7.1 +7
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5) httpd24-httpd-2.4.34-7.el7.1, httpd24-httpd-devel-2.4.34-7.el7.1, httpd24-httpd-manual-2.4.34-7.el7.1 +7
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) httpd24-httpd-2.4.34-7.el7.1, httpd24-httpd-devel-2.4.34-7.el7.1, httpd24-httpd-manual-2.4.34-7.el7.1 +7
    • Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) httpd24-httpd-2.4.34-7.el6.1, httpd24-httpd-devel-2.4.34-7.el6.1, httpd24-httpd-manual-2.4.34-7.el6.1 +5
    • Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) httpd24-httpd-2.4.34-7.el7.1, httpd24-httpd-devel-2.4.34-7.el7.1, httpd24-httpd-manual-2.4.34-7.el7.1 +7

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    uninett mod_auth_mellon — RHSA-2019:0766

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2019-02887 Open redirect in uninett mod_auth_mellonPriority LOW 31
    Show all 2 records → Advisory →
  • Advisory ·

    uninett mod_auth_mellon — FEDORA-2019-db1e9b3002

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2019-02887 Open redirect in uninett mod_auth_mellonPriority LOW 31
    Show all 2 records → Advisory →
Show 2 more groups
  • Advisory ·

    uninett mod_auth_mellon — FEDORA-2019-2d8ee47f61

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2019-02887 Open redirect in uninett mod_auth_mellonPriority LOW 31
    Show all 2 records → Advisory →
  • Advisory ·

    uninett mod_auth_mellon — USN-3924-1

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2019-02887 Open redirect in uninett mod_auth_mellonPriority LOW 31
    Show all 2 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2019:0985
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2019:0766
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2019:0766
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2019:0766
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2019:0766
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)Fixed RHSA-2019:0766
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)Fixed RHSA-2019:0766
Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2019:0746
Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2019:0746
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4)Fixed RHSA-2019:0746
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5)Fixed RHSA-2019:0746
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6)Fixed RHSA-2019:0746
Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2019:0746
Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2019:0746
Not affected: 1 product
  • Red Hat Enterprise Linux 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-3878
  2. 2026-10-03 Alias added: GHSA-6gx9-985p-w8c8

References

Exploit 1

Patch 1

Advisory 7

  • TI-2014-07039 The mod_auth_mellon module before 0.8.1 allows remote attackers to cause a denial of… CVSS 2.0HIGH 9.4
  • TI-2021-12310 Missing input validation in dynamic discovery example scripts. CVSS 3.1CRITICAL 9.4
  • TI-2016-01957 The am_read_post_data function in mod_auth_mellon before 0.11.1 does not limit the amount… CVSS 3.0HIGH 7.5
  • TI-2016-01956 The am_read_post_data function in mod_auth_mellon before 0.11.1 does not check if the… CVSS 3.0HIGH 7.5
  • TI-2014-07038 The mod_auth_mellon module before 0.8.1 allows remote attackers to obtain sensitive… CVSS 2.0MEDIUM 6.4
  • TI-2012-03863 radsecproxy before 1.6.1 does not properly verify certificates when there are… CVSS 2.0MEDIUM 6.4
See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences