Solution
Please Install the Updated Packages.
Insight
Fré dé ric Bardy discovered that Unity incorrectly filtered keyboard shortcuts when the screen was locked. A local attacker could possibly use this issue to run commands, and unlock the current session.
Giovanni Mellini discovered that Unity could display the Dash in certain conditions when the screen was locked. A local attacker could possibly use this issue to run commands, and unlock the current session.
Affected
unity on Ubuntu 14.04 LTS
References
Updated on 2015-03-25