USN-1831-2: OpenStack Nova regression

Releases

• Ubuntu 12.10

Packages

• 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://launchpad.net/bugs/1183606