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Debian LTS Advisory ([SECURITY] [DLA 1762-1] systemd security update)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
The remote host is missing an update for the 'systemd' package(s) announced via the DSA-1762-1 advisory.
Insight
Insight
Two vulnerabilities have been addressed in the systemd components systemd-tmpfiles and pam_systemd.so. CVE-2017-18078 systemd-tmpfiles in systemd attempted to support ownership/permission changes on hardlinked files even if the fs.protected_hardlinks sysctl is turned off, which allowed local users to bypass intended access restrictions via vectors involving a hard link to a file for which the user lacked write access. CVE-2019-3842 It was discovered that pam_systemd did not properly sanitize the environment before using the XDG_SEAT variable. It was possible for an attacker, in some particular configurations, to set a XDG_SEAT environment variable which allowed for commands to be checked against polkit policies using the 'allow_active' element rather than 'allow_any'.
Affected Software
Affected Software
'systemd' package(s) on Debian Linux.
Detection Method
Detection Method
Checks if a vulnerable package version is present on the target host.
Solution
Solution
For Debian 8 'Jessie', these problems have been fixed in version 215-17+deb8u12. We recommend that you upgrade your systemd packages.