Keystone access controls could be circumvented via EC2-style tokens.

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Ubuntu Security Notice USN-2061-1
December 19, 2013

keystone vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 13.10

Summary:

Keystone access controls could be circumvented via EC2-style tokens.

Software Description:
- keystone: OpenStack identity service

Details:

Steven Hardy discovered that Keystone did not properly enforce trusts when
using the ec2tokens API. An authenticated attacker could exploit this to
retrieve a token not scoped to the trust and elevate privileges to the
trustor's roles.

Update instructions:

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

Ubuntu 13.10:
  python-keystone                 1:2013.2-0ubuntu1.2

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

References:
  http://www.ubuntu.com/usn/usn-2061-1
  CVE-2013-6391

Package Information:
  https://launchpad.net/ubuntu/+source/keystone/1:2013.2-0ubuntu1.2