USN-3136-1: LXC vulnerability

23 November 2016

lxc vulnerability

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

  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Summary

LXC could be made to allow containers to access to the host filesystem.

Software Description

  • lxc - Linux Containers userspace tools

Details

Roman Fiedler discovered a directory traversal flaw in lxc-attach. An attacker with access to an LXC container could exploit this flaw to access files outside of the container.

Update instructions

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

Ubuntu 16.10
liblxc1 - 2.0.5-0ubuntu1.2
lxc1 - 2.0.5-0ubuntu1.2
Ubuntu 16.04 LTS
liblxc1 - 2.0.5-0ubuntu1~ubuntu16.04.3
lxc1 - 2.0.5-0ubuntu1~ubuntu16.04.3
Ubuntu 14.04 LTS
liblxc1 - 1.0.8-0ubuntu0.4
lxc - 1.0.8-0ubuntu0.4

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