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Ubuntu Security Notice USN-1875-1
June 14, 2013

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

- Ubuntu 13.04
- Ubuntu 12.10

Summary:

Keystone did not always properly verify expired PKI tokens or properly
authenticate users.

Software Description:
- keystone: OpenStack identity service

Details:

Eoghan Glynn and Alex Meade discovered that Keystone did not properly
perform expiry checks for the PKI tokens used in Keystone. If Keystone were
setup to use PKI tokens, a previously authenticated user could continue to
use a PKI token for longer than intended. This issue only affected Ubuntu
12.10 which does not use PKI tokens by default. (CVE-2013-2104)

Jose Castro Leon discovered that Keystone did not properly authenticate
users when using the LDAP backend. An attacker could obtain valid tokens
and impersonate other users by supplying an empty password. By default,
Ubuntu does not use the LDAP backend. (CVE-2013-2157)

Update instructions:

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

Ubuntu 13.04:
  python-keystone                 1:2013.1.1-0ubuntu2.1

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

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

References:
  http://www.ubuntu.com/usn/usn-1875-1
  CVE-2013-2104, CVE-2013-2157

Package Information:
  https://launchpad.net/ubuntu/+source/keystone/1:2013.1.1-0ubuntu2.1
  https://launchpad.net/ubuntu/+source/keystone/2012.2.4-0ubuntu3.1