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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
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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
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All versions including the Drupal 4.5 and Drupal 4.6 release series.

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