Ubuntu Security Notice USN-2753-3
5th October, 2015
lxc regression
A security issue affects these releases of Ubuntu and its
derivatives:
- Ubuntu 14.04 LTS
Summary
USN-2753-1 introduced a regression in LXC.
Software description
- 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 version:
- Ubuntu 14.04 LTS:
-
lxc-dev
1.0.7-0ubuntu0.7
-
liblxc1
1.0.7-0ubuntu0.7
-
lxc-templates
1.0.7-0ubuntu0.7
-
python3-lxc
1.0.7-0ubuntu0.7
-
lxc
1.0.7-0ubuntu0.7
-
lxc-tests
1.0.7-0ubuntu0.7
To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.