USN-2753-1: LXC vulnerability

29 September 2015

lxc vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 15.04
  • Ubuntu 14.04 LTS

Summary

LXC could be made to start containers without AppArmor confinement or access the host filesystem.

Software Description

  • lxc - Linux Containers userspace tools

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 15.04
lxc - 1.1.2-0ubuntu3.2
Ubuntu 14.04 LTS
lxc - 1.0.7-0ubuntu0.5

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.

References