Fix and resolve the Unity Settings Daemon problem in Ubuntu 15.04 and Ubuntu 14.04. Canonical has revealed USN-2741-1: Unity Settings Daemon vulnerability and the possible fix.
Ubuntu Security Notice USN-2741-1
Unity-settings-daemon vulnerability is a security issue that affects these releases of Ubuntu and its derivatives:
- Ubuntu 15.04
- Ubuntu 14.04 LTS
Summary
Unity Settings Daemon would allow mounting removable media while the screen is locked.
Software description
- unity-settings-daemon – daemon handling the Unity session settings
Details
It was discovered that the Unity Settings Daemon incorrectly allowed removable media to be mounted when the screen is locked. If a vulnerability were discovered in some other desktop component, such as an image library, a local attacker could possibly use this issue to gain access to the session.
Update instructions
The problem can be corrected by updating your system to the following package version:
- Ubuntu 15.04:
- unity-settings-daemon 15.04.1+15.04.20150408-0ubuntu1.2
- Ubuntu 14.04 LTS:
- unity-settings-daemon 14.04.0+14.04.20150825-0ubuntu2
To update your system, please run the following commands:
sudo apt-get update
sudo apt-get dist-upgrade
After a standard system update you need to restart your session to make all the necessary changes.