USN-2451-1: cgmanager vulnerability

6 January 2015

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

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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.

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Update instructions

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

Ubuntu 14.10
Ubuntu 14.04

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

References

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Further reading