USN-2104-1: LXC vulnerability
12 February 2014
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 13.10
LXC would allow unintended access to the host, bypassing intended confinement.
- lxc - Linux Containers userspace tools
Florian Sagar discovered that the LXC sshd template set incorrect mount permissions. An attacker could possibly use this flaw to cause privilege escalation on the host.
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to recreate LXC containers created with the sshd template to make all the necessary changes.