USN-2184-1 fixed lock screen vulnerabilities in Unity. Further testing hasuncovered more issues which have been fixed in this update. This updatealso fixes a regression with the shutdown dialogue. We apologize for the inconvenience. Original advisory details: Frédéric 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. The problem can be corrected by updating your system to the following package version: To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades. After a standard system update you need to restart your session to make allthe necessary changes. LP: 1314247
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