Unity before 7.2.3 and 7.3.x before 7.3.1, as used in Ubuntu, does not properly take focus of the keyboard when switching to the lock screen, which allows physically proximate attackers to bypass the lock screen by (1) leveraging a machine that had text selected when locking or (2) resuming from a suspension.

Affected: Ubuntu:14.04:LTS: unity

It was discovered that in certain circumstances Unity failed to successfully grab the keyboard when switching to the lock screen. A local attacker could possibly use this issue to run commands, and unlock the current session.