|Related CVEs||CVE-2017-18078 CVE-2019-3842|
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”.
For Debian 7 Wheezy, these problems have been fixed in version 44-11+deb7u7.
We recommend that you upgrade your systemd packages.
Further information about Extended LTS security advisories can be found at: https://deb.freexian.com/extended-lts/