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”.

Bugs

• <https://bugs.launchpad.net/bugs/1812316&gt;