Ubuntu: 2000-1: Nova vulnerabilities
Posted by Benjamin D. Thomas   
Ubuntu Nova could be made to crash if it received specially crafted networkrequests.
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Ubuntu Security Notice USN-2000-1
October 23, 2013

nova vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 13.04
- Ubuntu 12.10
- Ubuntu 12.04 LTS

Summary:

Nova could be made to crash if it received specially crafted network
requests.

Software Description:
- nova: OpenStack Compute cloud infrastructure

Details:

It was discovered that Nova did not properly enforce the is_public property
when determining flavor access. An authenticated attacker could exploit
this to obtain sensitive information in private flavors. This issue only
affected Ubuntu 12.10 and 13.10. (CVE-2013-2256, CVE-2013-4278)

Grant Murphy discovered that Nova would allow XML entity processing. A
remote unauthenticated attacker could exploit this using the Nova API to
cause a denial of service via resource exhaustion. This issue only
affected Ubuntu 13.10. (CVE-2013-4179)

Vishvananda Ishaya discovered that Nova inefficiently handled network
security group updates when Nova was configured to use nova-network. An
authenticated attacker could exploit this to cause a denial of service.
(CVE-2013-4185)

Jaroslav Henner discovered that Nova did not properly handle certain inputs
to the instance console when Nova was configured to use Apache Qpid. An
authenticated attacker could exploit this to cause a denial of service on
the compute node running the instance. By default, Ubuntu uses RabbitMQ
instead of Qpid. (CVE-2013-4261)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 13.04:
  python-nova                     1:2013.1.3-0ubuntu1.1

Ubuntu 12.10:
  python-nova                     2012.2.4-0ubuntu3.1

Ubuntu 12.04 LTS:
  python-nova                     2012.1.3+stable-20130423-e52e6912-0ubuntu1.2

In general, a standard system update will make all the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-2000-1
  CVE-2013-2256, CVE-2013-4179, CVE-2013-4185, CVE-2013-4261,
  CVE-2013-4278

Package Information:
  https://launchpad.net/ubuntu/+source/nova/1:2013.1.3-0ubuntu1.1
  https://launchpad.net/ubuntu/+source/nova/2012.2.4-0ubuntu3.1

https://launchpad.net/ubuntu/+source/nova/2012.1.3+stable-20130423-e52e6912-0ubuntu1.2