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Ubuntu 14.04 LTS USN-2184-2 Critical: Unity Lock Screen Bypass Threat

ubuntu
Calendar Grey April 30, 2014
Scroller Ubuntu
Critical issues with Unity's lock screen in Ubuntu 14.04 LTS necessitate immediate action and updates to safeguard the system's integrity.
The Unity lock screen could be bypassed.

Summary

The Unity lock screen could be bypassed.

Software Description:

- unity: Interface designed for efficiency of space and interaction.

Details:

USN-2184-1 fixed lock screen vulnerabilities in Unity. Further testing has

uncovered more issues which have been fixed in this update. This update

also 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.

Topics%20covered

Topics Covered

security advisory critical software update local attack ubuntu unity lock screen

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 14.04 LTS:
  unity                           7.2.0+14.04.20140423-0ubuntu1.2

After a standard system update you need to restart your session to make all
the necessary changes.

References

https://ubuntu.com/security/notices/USN-2184-2

https://ubuntu.com/security/notices/USN-2184-1

https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1314247

Severity
critical
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April 30, 2014

Topics%20covered

Topics Covered

security advisory critical software update local attack ubuntu unity lock screen

Package Information

https://launchpad.net/ubuntu/+source/unity/7.2.0+14.04.20140423-0ubuntu1.2

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