USN-2753-3: LXC regression

Releases

• Ubuntu 14.04 ESM

Packages

• lxc - Linux Containers userspace tools

Details

USN-2753-1 fixed a vulnerability in LXC. The update caused a regression
that prevented some containers from starting. This regression only
affected containers that had a path that contained a '/./' directory
specified as a bind mount target in their configuration file. This
update fixes the problem. We apologize for the inconvenience.

Original advisory details:

Roman Fiedler discovered a directory traversal flaw in lxc-start. A local
attacker with access to an LXC container could exploit this flaw to run
programs inside the container that are not confined by AppArmor or expose
unintended files in the host to the container.

Update instructions

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

Ubuntu 14.04

• liblxc1 - 1.0.7-0ubuntu0.7
• lxc - 1.0.7-0ubuntu0.7
• lxc-dev - 1.0.7-0ubuntu0.7
• lxc-templates - 1.0.7-0ubuntu0.7
• lxc-tests - 1.0.7-0ubuntu0.7
• python3-lxc - 1.0.7-0ubuntu0.7

In general, a standard system update will make all the necessary changes.

References

• https://launchpad.net/bugs/1501491