USN-3224-1: LXC vulnerability

9 March 2017

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 create arbitrary virtual network interfaces as an administrator.

Software Description

  • lxc - Linux Containers userspace tools

Details

Jann Horn discovered that LXC incorrectly verified permissions when creating virtual network interfaces. A local attacker could possibly use this issue to create virtual network interfaces in network namespaces that they do not own.

Update instructions

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

Ubuntu 16.10
lxc-common - 2.0.7-0ubuntu1~16.10.2
Ubuntu 16.04 LTS
lxc-common - 2.0.7-0ubuntu1~16.04.2
Ubuntu 14.04 LTS
lxc - 1.0.9-0ubuntu3

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