CVE-2020-12137

moderate-risk

Published 2020-04-24

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.

Do I need to act?

5.2% chance of exploitation in next 30 days

EPSS score — moderate exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 6.1/10 Medium

NETWORK / LOW complexity

Affected Products (10)

Mailman

Debian Linux

Fedora

Debian Linux

Ubuntu Linux

Backports Sle

Leap

Affected Vendors

Debian Gnu Canonical Fedoraproject Opensuse

References (22)

Third Party Advisory http://bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/NEWS

Mailing List http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00047.html

Mailing List http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00063.html

Mailing List http://www.openwall.com/lists/oss-security/2020/04/24/3

Mailing List https://lists.debian.org/debian-lts-announce/2020/05/msg00002.html

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...

Third Party Advisory https://usn.ubuntu.com/4348-1/

Third Party Advisory https://www.debian.org/security/2020/dsa-4664

Mailing List https://www.openwall.com/lists/oss-security/2020/02/24/2

Mailing List https://www.openwall.com/lists/oss-security/2020/02/24/3

Third Party Advisory http://bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/NEWS

Mailing List http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00047.html

Mailing List http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00063.html

Mailing List http://www.openwall.com/lists/oss-security/2020/04/24/3

Mailing List https://lists.debian.org/debian-lts-announce/2020/05/msg00002.html

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...

Third Party Advisory https://usn.ubuntu.com/4348-1/

Third Party Advisory https://www.debian.org/security/2020/dsa-4664

and 2 more references

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moderate-risk

Severity 23/34 · High

Exploitability 8/34 · Low

Exposure 16/34 · Moderate