UBUNTU-CVE-2020-12137

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    UBUNTU-CVE-2020-12137

    Published: 24 Apr 2020Last Modified: 4 Feb 2026
    Upstream:
    CVE-2020-12137

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2020-12137, https://www.openwall.com/lists/oss-security/2020/02/24/2, http://bazaar.launchpad.net/~mailman-coders/mailman/2.1/revision/1801, http://bazaar.launchpad.net/~mailman-coders/mailman/2.1/view/head:/NEWS, http://www.openwall.com/lists/oss-security/2020/04/24/3, https://www.openwall.com/lists/oss-security/2020/02/24/3, https://ubuntu.com/security/notices/USN-4348-1, https://ubuntu.com/security/notices/USN-5121-2, https://www.cve.org/CVERecord?id=CVE-2020-12137

    Affected packages

    Package

    Name: mailman

    Purl: pkg:deb/ubuntu/mailman@1:2.1.20-1ubuntu0.4?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1:2.1.20-1ubuntu0.4

    Affected versions

    1:2.1.20-1
    1:2.1.20-1ubuntu0.1
    1:2.1.20-1ubuntu0.3

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2020-12137 | CVE-DB