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Drupal Captcha Module Security Bypass Advisory Available in Danish  Advisory Available in German 

Secunia Advisory: SA23983  
Release Date: 2007-01-31
Last Update: 2007-02-05

Critical:
Not critical
Impact: Security Bypass
Where: From remote
Solution Status: Vendor Patch

Software:Drupal Captcha Module 4.x
Drupal Captcha Module 5.x

CVE reference:CVE-2007-0658 (Secunia mirror)

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Description:
A weakness has been reported in the Captcha module for Drupal, which can be exploited by malicious people to bypass certain security restrictions.

The weakness is caused due to an error within the validation of certain malformed responses. This can be exploited to bypass the captcha check by sending a specially crafted response.

The weakness is reported in Captcha 4.7.x versions prior to 4.7-1.2 and Captcha 5.x versions prior to 5.x-1.1.

Solution:
Update to a fixed version.

Captcha 4.7.x-1.2:
http://drupal.org/node/114367

Captcha 5.x-1.1.
http://drupal.org/node/114366

Provided and/or discovered by:
Independently reported by the Drupal Security Team and William Smith.

Changelog:
2007-02-05: Added CVE reference.

Original Advisory:
http://drupal.org/node/114364



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.

Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.


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