Drupal Custom Publishing Options 6.x XSS

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Vulnerability Report  
  
Reported: January 3, 2012  
Author: Justin C. Klein Keane <[email protected]>  
  
Description of Vulnerability:  
- -----------------------------  
Drupal (http://drupal.org) is a robust content management system (CMS)  
written in PHP and MySQL. The Drupal Custom Publishing Options module  
(https://drupal.org/project/custom_pub) contains a persistent cross  
site scripting (XSS) vulnerability due to the fact that it fails to  
sanitize format names before display.  
  
Systems affected:  
- -----------------  
Drupal 6.22 with Custom Publishing Options 6.x-1.4 was tested and  
shown to be vulnerable  
  
Impact  
- ------  
User could inject arbitrary scripts into pages affecting site users.  
This could result in administrative account compromise leading to web  
server process compromise.  
  
Mitigating factors:  
- -------------------  
In order to execute arbitrary script injection malicious users must  
have 'Administer nodes' permission.  
  
Proof of Concept:  
- -----------------  
1. Install and enable the Custom Publishing Options module  
2. Add a new label at ?q=admin/content/custom_pub inserting arbitrary  
HTML in the 'Publishing label' field.  
3. Save the label to view the rendered script or view it on the  
create content page for the appropriate content type.  
  
Vendor response:  
- ---------------  
Upgrade to the latest version  
  
- --   
Justin C. Klein Keane  
http://www.MadIrish.net  
  
The PGP signature on this email can be verified using the public key at  
http://www.madirish.net/gpgkey  
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