Open Redirect in Mod Auth Mellon Project
CVE-2019-3877
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.
Vulnerability class: Open Redirect
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.021 (81.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: -0.000
Affected products
- Mod Auth Mellon Project
- Uninett Mod Auth Mellon — versions v0.14.2
- Canonical Ubuntu Linux — versions 18.04, 18.10
- Fedoraproject Fedora — versions 29
- Red Hat Enterprise Linux — versions 7.0
Weakness classification (CWE)
References
- bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
- github.com/Uninett/mod_auth_mellon/issues/35 (Patch, Third Party Advisory)
- github.com/Uninett/mod_auth_mellon/commit/62041428a32de402e0be6ba45fe12df6a83be… (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-2019:0766 (vendor-advisory)
- access.redhat.com/errata/RHSA-2019:3421 (vendor-advisory)
Frequently asked questions
- What is CVE-2019-3877?
- CVE-2019-3877 is a medium-severity vulnerability in Mod Auth Mellon Project, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 5.8/10. Published 2019-03-27.
- How severe is CVE-2019-3877?
- Medium severity. CVSS v3 base score is 5.8 out of 10.