Nova could be prevented from applying security group policy.
It was discovered that, when defining security groups in Nova using the EC2 or OS APIs, specifying the network protocol (e.g. ‘TCP’) in the incorrect case would cause the security group to not be applied correctly. An attacker could use this to bypass Nova security group restrictions.
6 June 2012
A security issue affects these releases of Ubuntu and its derivatives:
Nova could be prevented from applying security group policy.
It was discovered that, when defining security groups in Nova using the EC2 or OS APIs, specifying the network protocol (e.g. ‘TCP’) in the incorrect case would cause the security group to not be applied correctly. An attacker could use this to bypass Nova security group restrictions.
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