Vulnerability Details : 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.
Vulnerability category: BypassGain privilege
Products affected by CVE-2019-3878
- cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
- cpe:2.3:a:mod_auth_mellon_project:mod_auth_mellon:*:*:*:*:*:apache:*:*
Exploit prediction scoring system (EPSS) score for CVE-2019-3878
2.20%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 90 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2019-3878
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.8
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:P/A:P |
8.6
|
6.4
|
NIST | |
|
8.1
|
HIGH | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
2.2
|
5.9
|
NIST | |
|
8.1
|
HIGH | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N |
2.8
|
5.2
|
Red Hat, Inc. |
CWE ids for CVE-2019-3878
-
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.Assigned by: nvd@nist.gov (Primary)
-
The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.Assigned by: secalert@redhat.com (Secondary)
References for CVE-2019-3878
-
https://access.redhat.com/errata/RHSA-2019:0746
RHSA-2019:0746 - Security Advisory - Red Hat Customer PortalThird Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X7NLAU7KROWNTHAYSA2S67X347F42L2I/
[SECURITY] Fedora 30 Update: mod_auth_mellon-0.14.2-1.fc30 - package-announce - Fedora Mailing-ListsMailing List;Release Notes;Third Party Advisory
-
https://usn.ubuntu.com/3924-1/
USN-3924-1: mod_auth_mellon vulnerabilities | Ubuntu security noticesThird Party Advisory
-
https://access.redhat.com/errata/RHBA-2019:0959
RHBA-2019:0959 - Bug Fix Advisory - Red Hat Customer Portal
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CNW5YMC5TLWVWNJEY6AIWNSNPRAMWPQJ/
[SECURITY] Fedora 29 Update: mod_auth_mellon-0.14.0-5.fc29 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://access.redhat.com/errata/RHSA-2019:0985
RHSA-2019:0985 - Security Advisory - Red Hat Customer Portal
-
https://github.com/Uninett/mod_auth_mellon/pull/196
Modify am_handler setup to run before mod_proxy by jhrozek · Pull Request #196 · Uninett/mod_auth_mellon · GitHubExploit;Third Party Advisory;Patch
-
https://access.redhat.com/errata/RHSA-2019:0766
RHSA-2019:0766 - Security Advisory - Red Hat Customer PortalThird Party Advisory
-
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3878
1691126 – (CVE-2019-3878) CVE-2019-3878 mod_auth_mellon: authentication bypass in ECP flowIssue Tracking;Patch;Third Party Advisory
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