Drupal 7.26 Custom Search 7.x-1.13 Cross Site Scripting

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Vulnerability Report  
  
  
Author: Justin C. Klein Keane <[email protected]>  
Reported: 19 Feb, 2014  
  
  
Description of Vulnerability:  
- -----------------------------  
Drupal (http://drupal.org) is a robust content management system (CMS)  
written in PHP and MySQL. The Custom Search module "alters the default  
search box in many ways. If you need to have options available like in  
advanced search, but directly in the search box, this module is for  
you." The Drupal Custom Search module  
(https://drupal.org/project/custom_search) contains a persistent cross  
site scripting (XSS) vulnerability due to the fact that it fails to  
sanitize filter labels before display.  
  
  
Systems affected:  
- -----------------  
Drupal 7.26 with Custom Search 7.x-1.13 was tested and shown to be  
vulnerable  
  
  
Impact  
- ------  
Users can inject arbitrary HTML (including JavaScript) in order to  
attack site users, including administrative users. This could lead to  
account compromise, which could in turn lead to web server compromise,  
or expose administrative users to client side malware attacks.  
  
  
Mitigating factors:  
- -------------------  
In order to inject arbitrary script malicious users must have the  
ability "administer custom search."  
  
  
Proof of Concept Exploits:  
- -----------------  
1. Install and enable the Custom Search module  
2. Navigate the Custom Search configuration at  
?q=admin/config/search/custom_search/results  
3. Change the 'Position' drop down to 'Above results'  
4. Enter "<script>alert('xss');</script>" in the 'Label text' input  
field  
5. Click the 'Save Configuration' button  
6. Submit any search to view the JavaScript on the results page.  
  
  
Vendor response:  
- ----------------  
Vulnerability is fixed in the latest versions of the Custom Search  
module (ref https://drupal.org/node/2231665)  
  
- --   
Justin C. Klein Keane  
http://www.MadIrish.net  
  
The digital signature on this e-mail may be verified using  
the public key at http://www.madirish.net/gpgkey  
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