XSS in GNU Mailman
CVE-2020-12137
GNU Mailman 2.x before 2.1.30 uses the .obj extension for scrubbed application/octet-stream MIME parts. This behavior may contribute to XSS attacks against list-archive visitors, because an HTTP reply from an archive web server may lack a MIME type, and a web browser may perform MIME sniffing, conclude that the MIME type should have been text/html, and execute JavaScript code.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.023 (82.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 82.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.023 · newest: 0.023 · change: 0.000
Affected products
- GNU Mailman
- Canonical Ubuntu Linux — versions 16.04, 18.04
- Debian Linux — versions 9.0, 10.0, 8.0
- Fedoraproject Fedora — versions 31, 32
- openSUSE Backports Sle — versions 15.0
- openSUSE Leap — versions 15.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.openwall.com/lists/oss-security/2020/02/24/2 (Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2020/02/24/3 (Mailing List, Third Party Advisory)
- bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/NEWS (Third Party Advisory)
- www.openwall.com/lists/oss-security/2020/04/24/3 (mailing-list, Mailing List, Third Party Advisory)
- www.debian.org/security/2020/dsa-4664 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2020/05/msg00002.html (mailing-list, Mailing List, Third Party Advisory)
- usn.ubuntu.com/4348-1/ (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)
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00047.html (vendor-advisory, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-12137?
- CVE-2020-12137 is a medium-severity vulnerability in GNU Mailman, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-04-24.
- How severe is CVE-2020-12137?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2020-12137 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.