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Drupal security advisory                                  DRUPAL-SA-2007-005
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Project:          Drupal core
Version:          4.7.x, 5.x
Date:             2007-Jan-29 
Security risk:    Highy critical
Exploitable from: Remote
Vulnerability:    Arbitrary code execution
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Description
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Previews on comments were not passed through normal form validation routines,
enabling users with the 'post comments' permission and access to more than one
input filter to execute arbitrary code. By default, anonymous and authenticated
users have access to only one input format.

Immediate workarounds include: disabling the comment module, revoking the 'post 
comments' permission for all users or limiting access to one input format.
 
Versions affected
-----------------
- Drupal 4.7.x versions before Drupal 4.7.6
- Drupal 5.x versions before Drupal 5.1

Solution
--------
- If you are running Drupal 4.7.x then upgrade to Drupal 4.7.6.
   http://ftp.osuosl.org/pub/drupal/files/projects/drupal-4.7.6.tar.gz
- If you are running Drupal 5.x then upgrade to Drupal 5.1.
   http://ftp.osuosl.org/pub/drupal/files/projects/drupal-5.1.tar.gz

- To patch Drupal 4.7.5 use 
    http://drupal.org/files/sa-2007-005/SA-2007-005-4.7.5.patch.
- To patch Drupal 5.0 use 
    http://drupal.org/files/sa-2007-005/SA-2007-005-5.0.patch.

Please note that the patches only contain changes related to this advisory, and
do not fix bugs that were solved in 4.7.6 or 5.1.

Reported by
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The Drupal security team.

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