Drupal Block Class Module 'Class' Field HTML Injection Vulnerability

Bugtraq ID:	37889
Class:	Input Validation Error
CVE:
Remote:	Yes
Local:	No
Published:	Jan 20 2010 12:00AM
Updated:	Jan 20 2010 12:00AM
Credit:	Didrik Nordström
Vulnerable:	Drupal Block Class 6.x-1.2 Drupal Block Class 6.x-1.1 Drupal Block Class 5.x-1.0
Not Vulnerable:	Drupal Block Class 6.x-1.3 Drupal Block Class 5.x-1.1

Drupal Block Class Module 'Class' Field HTML Injection Vulnerability

The Block Class module for Drupal is prone to an HTML-injection vulnerability because it fails to properly sanitize user-supplied input before using it in dynamically generated content.

Successful exploits will allow attacker-supplied HTML and script code to run in the context of the affected browser, potentially allowing the attacker to steal cookie-based authentication credentials or to control how the site is rendered to the user. Other attacks are also possible.

Versions prior to Block Class 5.x-1.2 and 6.x-1.3 are vulnerable.

Drupal Block Class Module 'Class' Field HTML Injection Vulnerability

Attackers can use a browser to exploit this issue.

Drupal Block Class Module 'Class' Field HTML Injection Vulnerability

Solution:
Updates are available. Please see the references for details.