[Security-news] SA-CONTRIB-2012-135 - CAPTCHA - Insufficient anti-automation prevention

[security-news at drupal.org]

View online: http://drupal.org/node/1762496

  * Advisory ID: DRUPAL-SA-CONTRIB-2012-135
  * Project: CAPTCHA [1] (third-party module)
  * Version: 6.x
  * Date: 2011-August-29
  * Security risk: Less critical [2]
  * Exploitable from: Remote
  * Vulnerability: Access bypass

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

This module enables you to protect website forms using a CAPTCHA. A CAPTCHA
is a test which attempts to differentiate between a human and an automated
bot or script.

The module doesn't ensure that test submissions have a single-use unique
token. This means that web robots could reuse a single successful submission
multiple times, reducing the effectiveness of the protection.

CVE: Requested

-------- VERSIONS AFFECTED  
---------------------------------------------------

  * CAPTCHA 6.x-2.x versions prior to 6.x-2.3

Drupal core is not affected. If you do not use the contributed CAPTCHA [3]
module, there is nothing you need to do.

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

Install the latest version:

  * If you use the CAPTCHA module for Drupal 6.x, upgrade to CAPTCHA 6.x-2.3
    [4] or greater

Also see the CAPTCHA [5] project page.

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

  * LeeSai [6]
  * MustLive

-------- FIXED BY  
------------------------------------------------------------

  * Stefaan Lippens [7] a CAPTCHA module maintainer

-------- COORDINATED BY  
------------------------------------------------------

  * Owen Barton [8] of the Drupal Security Team
  * Greg Knaddison [9] of the Drupal Security Team

-------- CONTACT AND MORE INFORMATION  
----------------------------------------

The Drupal security team can be reached at security at drupal.org or via the
contact form at http://drupal.org/contact [10].

Learn more about the Drupal Security team and their policies [11], writing
secure code for Drupal [12], and securing your site [13].


[1] http://drupal.org/project/captcha
[2] http://drupal.org/security-team/risk-levels
[3] http://drupal.org/project/captcha
[4] http://drupal.org/node/967244
[5] http://drupal.org/project/captcha
[6] http://drupal.org/user/680166
[7] http://drupal.org/user/41478
[8] http://drupal.org/user/19668
[9] http://drupal.org/user/36762
[10] http://drupal.org/contact
[11] http://drupal.org/security-team
[12] http://drupal.org/writing-secure-code
[13] http://drupal.org/security/secure-configuration