Ubuntu Security Notice 968-1 – It was discovered that the Ubuntu image shipped on some Dell Latitude 2110 systems was accidentally configured to allow unauthenticated package installations. A remote attacker intercepting network communications or a malicious archive mirror server could exploit this to trick the user into installing unsigned packages, resulting in arbitrary code execution with root privileges.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/92503/USN-968-1.txt
Source: https://packetstormsecurity.com/files/92503/Ubuntu-Security-Notice-968-1.html