=========================================================================Ubuntu Security Notice USN-1831-2
May 29, 2013

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

- Ubuntu 12.10

Summary:

USN-1831-1 introduced a regression in OpenStack Nova.

Software Description:
- nova: OpenStack Compute cloud infrastructure

Details:

USN-1831-1 fixed a vulnerability in OpenStack Nova. The upstream fix
introduced a regression where instances using uncached QCOW2 images would
fail to start. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

 Loganathan Parthipan discovered that Nova did not verify the size of QCOW2
 instance storage. An authenticated attacker could exploit this to cause a
 denial of service by creating an image with a large virtual size with
 little data, then filling the virtual disk.

Update instructions:

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

Ubuntu 12.10:
  python-nova                     2012.2.3-0ubuntu2.2

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

References:
  https://ubuntu.com/security/notices/USN-1831-2
  https://ubuntu.com/security/notices/USN-1831-1
  https://bugs.launchpad.net/nova/+bug/1183606

Package Information:
  https://launchpad.net/ubuntu/+source/nova/2012.2.3-0ubuntu2.2