Ubuntu Security Notice 380-1 – Steve Grubb discovered that netlink messages were not being checked for their sender identity. This could lead to local users manipulating the Avahi service.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/51996/USN-380-1.txt
Source: https://packetstormsecurity.com/files/51996/Ubuntu-Security-Notice-380-1.html