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Ubuntu Security Notice USN-2753-3

Ubuntu Security Notice USN-2753-3
Posted Oct 6, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2753-3 - USN-2753-1 fixed a vulnerability in LXC. The update caused a regression that prevented some containers from starting. This regression only affected containers that had a path that contained a '/./' directory specified as a bind mount target in their configuration file. This update fixes the problem. 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. Various other issues were also addressed.

tags | advisory, local
systems | linux, ubuntu
MD5 | 74cc1906ceb5622deec8ace92c0a41fd

Ubuntu Security Notice USN-2753-3

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Content-Disposition: inline

==========================================================================Ubuntu Security Notice USN-2753-3
October 05, 2015

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

- Ubuntu 14.04 LTS

Summary:

USN-2753-1 introduced a regression in LXC.

Software Description:
- lxc: Linux Containers userspace tools

Details:

USN-2753-1 fixed a vulnerability in LXC. The update caused a regression
that prevented some containers from starting. This regression only
affected containers that had a path that contained a '/./' directory
specified as a bind mount target in their configuration file. This
update fixes the problem. We apologize for the inconvenience.

Original advisory 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 14.04 LTS:
liblxc1 1.0.7-0ubuntu0.7
lxc 1.0.7-0ubuntu0.7
lxc-dev 1.0.7-0ubuntu0.7
lxc-templates 1.0.7-0ubuntu0.7
lxc-tests 1.0.7-0ubuntu0.7
python3-lxc 1.0.7-0ubuntu0.7

In general, a standard system update will make all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-2753-3
http://www.ubuntu.com/usn/usn-2753-1
https://launchpad.net/bugs/1501491

Package Information:
https://launchpad.net/ubuntu/+source/lxc/1.0.7-0ubuntu0.7

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