1. Ubuntu Security Notices
  2. USN-2451-1

USN-2451-1: cgmanager vulnerability

Publication date

6 January 2015

Overview

cgmanager could be made to expose sensitive information or devices to containers running on the system.

Releases

Packages

Details

Serge Hallyn discovered that cgmanager did not consistently enforce
proper nesting when modifying cgroup properties. A local attacker in a
privileged container could use this to set cgroup values for all cgroups.

Serge Hallyn discovered that cgmanager did not consistently enforce
proper nesting when modifying cgroup properties. A local attacker in a
privileged container could use this to set cgroup values for all cgroups.

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
14.10 utopic cgmanager –  0.32-4ubuntu1.1
14.04 trusty cgmanager –  0.24-0ubuntu7.1

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References

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