Access Restriction Bypass

Affecting systemd package, versions <232-25+deb9u11

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Overview

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

CVSS Score

7.0
high severity
  • Attack Vector
    Local
  • Attack Complexity
    High
  • Privileges Required
    Low
  • User Interaction
    None
  • Scope
    Unchanged
  • Confidentiality
    High
  • Integrity
    High
  • Availability
    High
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVE
CVE-2019-3842
CWE
CWE-264 CWE-285
Snyk ID
SNYK-DEBIAN9-SYSTEMD-342746
Disclosed
09 Apr, 2019
Published
09 Apr, 2019