Nova could be made to overwrite files.
David Black discovered that Nova did not properly perform input validation during image registration. An attacker could exploit this by registering a crafted image using the EC2 API or S3/RegisterImage method and overwrite files as the nova user.
13 December 2011
A security issue affects these releases of Ubuntu and its derivatives:
Nova could be made to overwrite files.
David Black discovered that Nova did not properly perform input validation during image registration. An attacker could exploit this by registering a crafted image using the EC2 API or S3/RegisterImage method and overwrite files as the nova user.
The problem can be corrected by updating your system to the following package versions:
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.
Vulmon