Auth bypass in Mod Auth Mellon Project
CVE-2019-3878
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.030 (86.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 86.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.030 · newest: 0.030 · change: 0.000
Affected products
- Mod Auth Mellon Project
- Uninett Mod Auth Mellon — versions before v0.14.2
- Canonical Ubuntu Linux — versions 18.04, 18.10
- Fedoraproject Fedora — versions 29, 30
- Red Hat Enterprise Linux — versions 7.0
- Red Hat Enterprise Linux Desktop — versions 7.0
- Red Hat Enterprise Linux Server — versions 7.0
- Red Hat Enterprise Linux Server Aus — versions 7.6
- Red Hat Enterprise Linux Server Eus — versions 7.6
- Red Hat Enterprise Linux Server Tus — versions 7.6
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- github.com/Uninett/mod_auth_mellon/pull/196 (Exploit, Patch, Third Party Advisory)
- usn.ubuntu.com/3924-1/ (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- access.redhat.com/errata/RHSA-2019:0746 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2019:0766 (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2019:0985 (vendor-advisory)
- access.redhat.com/errata/RHBA-2019:0959 (vendor-advisory)
Frequently asked questions
- What is CVE-2019-3878?
- CVE-2019-3878 is a high-severity vulnerability in Mod Auth Mellon Project, classified under Authentication Bypass by Primary Weakness. CVSS score: 8.1/10. Published 2019-03-26.
- How severe is CVE-2019-3878?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2019-3878 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.