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------------DRUPAL CORE - ARBITRARY CODE EXECUTION------------

* Advisory ID: DRUPAL-SA-2007-005
* Project: Drupal core
* Version: 4.7.x, 5.x
* Date: 2007-Jan-29
* Security risk: Highly critical
* Exploitable from: Remote
* Vulnerability: Arbitrary code execution

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

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 before version 4.7.6.
* Drupal 5.x before version 5.1.

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

Install the latest version:

* Drupal 4.7.6
[http://ftp.osuosl.org/pub/drupal/files/projects/drupal-4.7.6.tar.gz].
* Drupal 5.1
[http://ftp.osuosl.org/pub/drupal/files/projects/drupal-5.1.tar.gz].
* To patch Drupal 4.7.5 use SA-2007-005-4.7.5.patch
[http://drupal.org/files/sa-2007-005/SA-2007-005-4.7.5.patch].
* To patch Drupal 5.0 use SA-2007-005-5.0.patch
[http://drupal.org/files/sa-2007-005/SA-2007-005-5.0.patch].

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

The Drupal security team.

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

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