By Drupal Security Team on
  • Advisory ID: DRUPAL-SA-CONTRIB-2010-015
  • Project: Signwriter (third-party module)
  • Version: 5.x, 6.x
  • Date: 2010-February-3
  • Security risk: Critical
  • Exploitable from: Remote
  • Vulnerability: Arbitrary code execution

Description

The Signwriter module allows the use of TrueType fonts to replace text in headings, blocks, menus and filtered text. This vulnerability allows a remote attacker with the ability to create content using an input filter created with a Signwriter profile to execute arbitrary PHP code on an affected system. The vulnerability exists due to unsafe use of PHP's preg_replace function with the e option, causing the replacement to be executed as PHP code.

Versions affected

  • Signwriter for Drupal 5.x prior to 5.x-1.6
  • Signwriter for Drupal 6.x prior to 6.x-2.0-beta2

Drupal core is not affected. If you do not use the Signwriter, there is nothing you need to do.

Solution

Upgrade to the latest version:

See also the Signwriter page.

Reported by

Fixed by

Contact

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

⋅ Categories: Drupal 5.x, Drupal 6.x