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Drupal security advisory                                  DRUPAL-SA-2005-001
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Advisory ID:    DRUPAL-SA-2005-001
Date:           2005-jun-01
Security risk:  highly critical
Impact:         system access
Where:          from remote
Vulnerability:  privilege escalation
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Description
-----------
The Drupal Security Team has found that the privilege system of Drupal can 
be circumvented in a very special case because an input check is not 
implemented properly.

Versions affected
-----------------
Drupal 4.4.0, 4.4.1, 4.4.2
Drupal 4.5.0, 4.5.1, 4.5.2
Drupal 4.6.0

Impact
------
If public registration is allowed then it is possible for an attacker
to obtain additional user roles. As a result, an attacker could grant 
himself administration privileges.

Solution
--------
Either upgrade or disable public registration:  
- If you are running Drupal 4.4.x, then upgrade to Drupal 4.4.3.
- If you are running Drupal 4.5.2, then upgrade to Drupal 4.5.3.
- If you are running Drupal 4.6.0, then upgrade to Drupal 4.6.1.
- If you cannot upgrade immediately, you can secure your site by 
  disabling the public registration of Drupal accounts from Drupal's user
  administration screen. Log-in as an administrator, go to "administer >> 
  users >> configure" and set the "Public registrations" option to "Only 
  site administrators can create new user accounts".

Contact
-------
The security contact for Drupal can be reached at security@drupal.org 
or using the form at http://drupal.org/contact.


// Uwe Herman, on behalf of the Drupal Security Team.
-- 
Uwe Hermann <uwe@hermann-uwe.de>
http://www.hermann-uwe.de                 | http://www.crazy-hacks.org
http://www.it-services-uh.de              | http://www.phpmeat.org
http://www.unmaintained-free-software.org | http://www.holsham-traders.de