Drupal Shibboleth Authentication Module Authentication Bypass Vulnerability

Bugtraq ID:	36684
Class:	Access Validation Error
CVE:
Remote:	Yes
Local:	No
Published:	Oct 14 2009 12:00AM
Updated:	Oct 16 2009 07:38PM
Credit:	Kristof Bajnok
Vulnerable:	Drupal Shibboleth authentication 6.x-3.1 Drupal Shibboleth authentication 5.x-3.3
Not Vulnerable:	Drupal Shibboleth authentication 6.x-3.2 Drupal Shibboleth authentication 5.x-3.4

Drupal Shibboleth Authentication Module Authentication Bypass Vulnerability

The Shibboleth authentication module for Drupal is prone to an authentication-bypass vulnerability because it fails to properly handle changes in an underlying Shibboleth session.

An attacker can exploit this issue to impersonate other users or gain elevated privileges on a website protected with the Shibboleth authentication module. This may lead to further attacks.

Versions prior to Shibboleth authentication 6.x-3.2 and 5.x-3.4 are vulnerable.

Drupal Shibboleth Authentication Module Authentication Bypass Vulnerability

An attacker will use a browser to exploit this issue.

Drupal Shibboleth Authentication Module Authentication Bypass Vulnerability

Solution:
The vendor has released updates. Please see the references for details.


Drupal Shibboleth authentication 6.x-3.1

• Drupal shib_auth-6.x-3.2.tar.gz
  http://ftp.drupal.org/files/projects/shib_auth-6.x-3.2.tar.gz

Drupal Shibboleth authentication 5.x-3.3

• Drupal shib_auth-5.x-3.4.tar.gz
  http://ftp.drupal.org/files/projects/shib_auth-5.x-3.4.tar.gz

Drupal Shibboleth Authentication Module Authentication Bypass Vulnerability

References:

• Shibboleth authentication Homepage (Drupal)
  
• Vendor Homepage (Drupal)
  
• SA-CONTRIB-2009-070 - Shibboleth authentication - Impersonation, privilege escal (Drupal)