Check the version of nova
Please Install the Updated Packages.
Garth Mollett discovered that OpenStack Nova did not properly clean up an instance when using rescue mode with the VMWare driver. A remove authenticated user could exploit this to bypass intended quota limits. By default, Ubuntu does not use the VMWare driver. (CVE-2014-3608) Amrith Kumar discovered that OpenStack Nova did not properly sanitize log message contents. Under certain circumstances, a local attacker with read access to Nova log files could obtain access to sensitive information. (CVE-2014-7230)
nova on Ubuntu 14.04 LTS
Get the installed version with the help of detect NVT and check if the version is vulnerable or not.