CVE-2017-11171

Bad reference counting in the context of accept_ice_connection() in
gsm-xsmp-server.c in old versions of gnome-session up until version 2.29.92
allows a local attacker to establish ICE connections to gnome-session with
invalid authentication data (an invalid magic cookie). Each failed
authentication attempt will leak a file descriptor in gnome-session. When
the maximum number of file descriptors is exhausted in the gnome-session
process, it will enter an infinite loop trying to communicate without
success, consuming 100% of the CPU. The graphical session associated with
the gnome-session process will stop working correctly, because
communication with gnome-session is no longer possible.