Hash: SHA1

             AUSCERT External Security Bulletin Redistribution

                    ESB-2008.0107 -- [Win][UNIX/Linux]
            Drupal OpenID Module incorrect claimed_id returned
                              31 January 2008


        AusCERT Security Bulletin Summary

Product:              Drupal OpenID Module version 5.x-1.0
Publisher:            Drupal
Operating System:     UNIX variants (UNIX, Linux, OSX)
Impact:               Provide Misleading Information
Access:               Remote/Unauthenticated

Original Bulletin:    http://drupal.org/node/216022

- --------------------------BEGIN INCLUDED TEXT--------------------

- ------------SA-2008-016 - OPENID - INCORRECT CLAIMED_ID RETURNED FOR OPENID 2.0------------

  * Advisory ID: DRUPAL-SA-2008-016

  * Project: OpenID (third-party module)

  * Version: 5.x-1.0

  * Date: 2007-January-30

  * Security risk: Less critical

  * Exploitable from: Remote

  * Vulnerability: Identity impersonation

- ------------DESCRIPTION------------

The OpenID module has a vulnerability which allows OpenID version 2.0 positive
assertions that are not properly verified to return an invalid or impersonated
claimed_id. To exploit this vulnerability an attacker could set up an OpenID
provider,  example1.com, that claimed to be the authority for another domain,
example2.com, when in fact it was not. Thus, example2.com OpenID's could be

In OpenID 2.0, the OpenID provider may return a claimed_id that is different
from the original claimed_id submitted by the user (and hence in the current
session). If this is the case, then discovery must be performed on that
claimed_id to ensure that the correct OpenID provider endpoint was used. 

For more information, see [
http://openid.net/specs/openid-authentication-2_0.html#verify_disco ] .

- ------------VERSIONS AFFECTED------------

OpenID (openid) versions:

  * 5.x-1.0 and earlier

Drupal core is not affected. If you do not use the contributed OpenID module,
there is nothing you need to do. 

- ------------SOLUTION------------

Install the latest version:

  * OpenID 5.x-1.1 [ http://drupal.org/node/216029 ]

See also the OpenID project page [ http://drupal.org/project/openid ]. 

- ------------REPORTED BY------------

Johnny Bufu [ http://drupal.org/user/226462 ].

- ------------CONTACT------------

The security contact for Drupal can be reached at security at drupal.org or via
the form at [ http://drupal.org/contact ].

- --------------------------END INCLUDED TEXT--------------------

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