UBUNTU-CVE-2019-3842

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    UBUNTU-CVE-2019-3842

    Published: 8 Apr 2019Last Modified: 22 Apr 2026
    Upstream:
    CVE-2019-3842
    Aliases:
    USN-3938-1

    Summary:

    Details: In systemd before v242-rc4, it was discovered that pam_systemd does not properly sanitize the environment before using the XDG_SEAT variable. It is possible for an attacker, in some particular configurations, to set a XDG_SEAT environment variable which allows for commands to be checked against polkit policies using the "allow_active" element rather than "allow_any".

    References: https://ubuntu.com/security/CVE-2019-3842, https://ubuntu.com/security/notices/USN-3938-1, https://www.cve.org/CVERecord?id=CVE-2019-3842

    Affected packages

    Package

    Name: systemd

    Purl: pkg:deb/ubuntu/[email protected]?arch=source&distro=trusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -204-5ubuntu20.31

    Affected versions

    204-0ubuntu18

    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