USN-1831-2: OpenStack Nova regression

29 May 2013

nova regression

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

  • Ubuntu 12.10


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

Software Description

  • nova - OpenStack Compute cloud infrastructure


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

To update your system, please follow these instructions:

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