Ubuntu: 2104-1: LXC vulnerability
Posted by Benjamin D. Thomas   
Ubuntu LXC would allow unintended access to the host, bypassing intendedconfinement.
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Ubuntu Security Notice USN-2104-1
February 12, 2014

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

- Ubuntu 13.10

Summary:

LXC would allow unintended access to the host, bypassing intended
confinement.

Software Description:
- lxc: Linux Containers userspace tools

Details:

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.

Update instructions:

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

Ubuntu 13.10:
  lxc-templates                   1.0.0~alpha1-0ubuntu14.1

After a standard system update you need to recreate LXC containers created
with the sshd template to make all the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-2104-1
  CVE-2013-6441

Package Information:
  https://launchpad.net/ubuntu/+source/lxc/1.0.0~alpha1-0ubuntu14.1