Ubuntu Security Notice USN-1831-2
28th May, 2013
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.10
USN-1831-1 introduced a regression in OpenStack Nova.
- 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.
The problem can be corrected by updating your system to the following package version:
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.