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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
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- Drupal 4.7.x versions before Drupal 4.7.6
- Drupal 5.x versions before Drupal 5.1

Solution
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- 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.