Ubuntu Security Notice 2325-1 - Alex Gaynor discovered that OpenStack Nova would sometimes respond with variable times when comparing authentication tokens. If nova were configured to proxy metadata requests via Neutron, a remote authenticated attacker could exploit this to conduct timing attacks and ascertain configuration details of another instance.
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Ubuntu Security Notice USN-2325-1
August 21, 2014
nova vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.04 LTS
Summary:
OpenStack Nova could be made to expose sensitive information over the
network.
Software Description:
- nova: OpenStack Compute cloud infrastructure
Details:
Alex Gaynor discovered that OpenStack Nova would sometimes respond with
variable times when comparing authentication tokens. If nova were
configured to proxy metadata requests via Neutron, a remote authenticated
attacker could exploit this to conduct timing attacks and ascertain
configuration details of another instance.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 14.04 LTS:
python-nova 1:2014.1.2-0ubuntu1.1
In general, a standard system update will make all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-2325-1
CVE-2014-3517
Package Information:
https://launchpad.net/ubuntu/+source/nova/1:2014.1.2-0ubuntu1.1