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    CVE-2019-3842

    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".

    Published:Apr 8, 2019
    Last Modified:Jun 9, 2025
    EPS:Apr 9, 2019
    EPSS Score:0.0009
    CVSS Score:7

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Systemd Project
    Product
    Systemd

    Exploits

    http://packetstormsecurity.com/files/152610/systemd-Seat-Verification-Active-Session-Spoofing.htmlhttps://www.exploit-db.com/exploits/46743/http://packetstormsecurity.com/files/152610/systemd-Seat-Verification-Active-Session-Spoofing.htmlhttps://www.exploit-db.com/exploits/46743/https://www.exploit-db.com/exploits/46743

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    References

    http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.html
    http://packetstormsecurity.com/files/152610/systemd-Seat-Verification-Active-Session-Spoofing.html
    https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3842
    https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
    https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
    https://lists.debian.org/debian-lts-announce/2019/04/msg00022.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/STR36RJE4ZZIORMDXRERVBHMPRNRTHAC/
    https://www.exploit-db.com/exploits/46743/
    http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00062.html
    http://packetstormsecurity.com/files/152610/systemd-Seat-Verification-Active-Session-Spoofing.html
    https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3842
    https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
    https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
    https://lists.debian.org/debian-lts-announce/2019/04/msg00022.html
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/STR36RJE4ZZIORMDXRERVBHMPRNRTHAC/
    https://www.exploit-db.com/exploits/46743/

    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