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Improper Authorization Affecting systemd package, versions <237-3ubuntu10.19

medium

Snyk CVSS

    Attack Complexity High
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 0.22% (60th percentile)
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NVD
7 high
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SUSE
4.5 medium
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Red Hat
4.5 medium

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  • Snyk ID SNYK-UBUNTU1804-SYSTEMD-342620
  • published 9 Apr 2019
  • disclosed 9 Apr 2019
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Introduced: 9 Apr 2019

CVE-2019-3842 Open this link in a new tab
CWE-285 Open this link in a new tab

How to fix?

Upgrade Ubuntu:18.04 systemd to version 237-3ubuntu10.19 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream systemd package and not the systemd package as distributed by Ubuntu. See How to fix? for Ubuntu:18.04 relevant fixed versions and status.

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