=========================================================================Ubuntu Security Notice USN-2034-1
November 25, 2013

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

- Ubuntu 13.10
- Ubuntu 13.04
- Ubuntu 12.10

Summary:

Keystone would improperly remove roles when it was configured to use the
LDAP backend.

Software Description:
- keystone: OpenStack identity service

Details:

Brant Knudson discovered a logic error in the LDAP backend in Keystone
where removing a role on a tenant for a user who does not have that role
would instead add the role to the user. An authenticated user could use
this to gain privileges. Ubuntu is not configured to use the LDAP Keystone
backend by default.

Update instructions:

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

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

Ubuntu 13.04:
  python-keystone                 1:2013.1.4-0ubuntu1.1

Ubuntu 12.10:
  python-keystone                 2012.2.4-0ubuntu3.3

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

References:
  https://ubuntu.com/security/notices/USN-2034-1
  CVE-2013-4477

Package Information:
  https://launchpad.net/ubuntu/+source/keystone/1:2013.2-0ubuntu1.1
  https://launchpad.net/ubuntu/+source/keystone/1:2013.1.4-0ubuntu1.1
  https://launchpad.net/ubuntu/+source/keystone/2012.2.4-0ubuntu3.3