Vulnerability Description
A vulnerability was found in mod_auth_mellon before v0.14.2. An open redirect in the logout URL allows requests with backslashes to pass through by assuming that it is a relative URL, while the browsers silently convert backslash characters into forward slashes treating them as an absolute URL. This mismatch allows an attacker to bypass the redirect URL validation logic in apr_uri_parse function.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mod Auth Mellon Project | Mod Auth Mellon | < 0.14.2 |
| Fedoraproject | Fedora | 29 |
| Redhat | Enterprise Linux | 7.0 |
| Canonical | Ubuntu Linux | 18.04 |
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2019:0766
- https://access.redhat.com/errata/RHSA-2019:3421
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3877Issue TrackingPatchThird Party Advisory
- https://github.com/Uninett/mod_auth_mellon/commit/62041428a32de402e0be6ba45fe12dPatchThird Party Advisory
- https://github.com/Uninett/mod_auth_mellon/issues/35PatchThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://usn.ubuntu.com/3924-1/Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0766
- https://access.redhat.com/errata/RHSA-2019:3421
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3877Issue TrackingPatchThird Party Advisory
- https://github.com/Uninett/mod_auth_mellon/commit/62041428a32de402e0be6ba45fe12dPatchThird Party Advisory
- https://github.com/Uninett/mod_auth_mellon/issues/35PatchThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
FAQ
What is CVE-2019-3877?
CVE-2019-3877 is a vulnerability with a CVSS score of 5.8 (MEDIUM). A vulnerability was found in mod_auth_mellon before v0.14.2. An open redirect in the logout URL allows requests with backslashes to pass through by assuming that it is a relative URL, while the browse...
How severe is CVE-2019-3877?
CVE-2019-3877 has been rated MEDIUM with a CVSS base score of 5.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-3877?
Check the references section above for vendor advisories and patch information. Affected products include: Mod Auth Mellon Project Mod Auth Mellon, Fedoraproject Fedora, Redhat Enterprise Linux, Canonical Ubuntu Linux.