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ESB-2009.1421 - [Win][UNIX/Linux] Webform (Drupal third-party module): Administrator compromise - Remote with user interaction

Date: 15 October 2009

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2009.1421
      Vulnerability identified in Webform (Drupal third-party module)
                              15 October 2009

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Webform (Drupal third-party module)
Publisher:         Drupal
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Administrator Compromise -- Remote with User Interaction
                   Cross-site Scripting     -- Remote with User Interaction
Resolution:        Patch/Upgrade

Original Bulletin: 
   http://drupal.org/node/604942

- --------------------------BEGIN INCLUDED TEXT--------------------

  * Advisory ID: DRUPAL-SA-CONTRIB-2009-074
  * Project: Webform (third-party module)
  * Version: 5.x, 6.x
  * Date: 2009-October-14
  * Security risk: Moderately critical
  * Exploitable from: Remote
  * Vulnerability: Multiple vulnerabilities

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

.... Cross-site scripting

The Webform module enables the creation of custom forms for collecting data
from users. The Webform module does not properly escape field labels in
certain situations. A malicious user with permission to create webforms could
attempt a cross-site scripting (XSS [1]) attack when viewing the result,
leading to the user gaining full administrative access.
.... Session data disclosure

The Webform module fails to prevent the page from being cached when a default
value uses token placeholders. This leads to disclosure of session variables
to anonymous users when caching is enabled.
- -------- VERSIONS AFFECTED  
- ---------------------------------------------------

  * Webform for Drupal 6.x prior to 6.x-2.8
  * Webform for Drupal 5.x prior to 5.x-2.8

Drupal core is not affected. If you do not use the contributed Webform
module, there is nothing you need to do.
- -------- SOLUTION  
- ------------------------------------------------------------

Upgrade to the latest version:
  * If you use Webform for Drupal 6.x upgrade to Webform 6.x-2.8 [2]
  * If you use Webform for Drupal 5.x upgrade to Webform 5.x-2.8 [3]

See also the Webform project page [4].
- -------- REPORTED BY  
- ---------------------------------------------------------

The XSS issue was reported by Justine Klein Keane [5]. The session disclosure
issue was reported by seattlehimay [6].
- -------- FIXED BY  
- ------------------------------------------------------------

The XSS issue was fixed by Greg Knaddison [7] of the Drupal Security Team.
The session disclosure issue was fixed by Nathan Haug [8], the module
maintainer.
- -------- CONTACT  
- -------------------------------------------------------------

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

[1] http://en.wikipedia.org/wiki/Cross-site_scripting
[2] http://drupal.org/node/604920
[3] http://drupal.org/node/604922
[4] http://drupal.org/project/webform
[5] http://drupal.org/user/302225
[6] http://druFpal.org/user/348366
[7] http://drupal.org/user/36762
[8] http://drupal.org/user/35821

_______________________________________________

- --------------------------END INCLUDED TEXT--------------------

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        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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                On call after hours for member emergencies only.
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