Title:
======
Fortigate UTM WAF Appliance - Cross Site Vulnerabilities


Date:
=====
2012-09-07


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=559


VL-ID:
=====
559


Common Vulnerability Scoring System:
====================================
3.5


Introduction:
=============
The FortiGate series of multi-threat security systems detect and eliminate the most damaging, content-based threats from email 
and Web traffic such as viruses, worms, intrusions, inappropriate Web content and more in real time - without degrading 
network performance.

Ranging from the FortiGate-30 series for small offices to the FortiGate-5000 series for large enterprises, service providers and 
carriers, the FortiGate line combines the FortiOS™ security operating system with FortiASIC processors and other hardware to provide 
a comprehensive and high-performance array of security and networking functions including:

    * Firewall, VPN, and Traffic Shaping
    * Intrusion Prevention System (IPS)
    * Antivirus/Antispyware/Antimalware
    * Web Filtering
    * Antispam
    * Application Control (e.g., IM and P2P)
    * VoIP Support (H.323. and SCCP)
    * Layer 2/3 routing
    * Multiple WAN interface options

FortiGate appliances provide cost-effective, comprehensive protection against network, content, and application-level threats - including 
complex attacks favored by cybercriminals - without degrading network availability and uptime. FortiGate platforms incorporate sophisticated 
networking features, such as high availability (active/active, active/passive) for maximum network uptime, and virtual domain (VDOM) 
capabilities to separate various networks requiring different security policies.

Fortigate applainces are Pentagon & US Military certified. 
The military provides high security standards & save outdoor camps, air base, offices with fortigate hardware.

(Copy from the Vendor Homepage: http://www.fortinet.com/products/fortigate )


Abstract:
=========
Vulnerability-Lab Research Team discovered multiple non-persistent Web Vulnerabilities in the FortiGates UTM Appliance Application.


Report-Timeline:
================
2012-05-07:  Researcher Notification & Coordination
2012-05-10:  Vendor Notification
2012-06-08:  Vendor Response/Feedback
2012-08-30:  Vendor Fix/Patch ( FortiOS v4.3.8 B0630 & FortiOS v5.0 B064 )
2012-09-07:  Public or Non-Public Disclosure


Status:
========
Published


Affected Products:
==================
Fortigate
Product: UTM Firewall Appliance Application vFortiGate-5000 Series;FortiGate-3950 Series;FortiGate-3810A;


Exploitation-Technique:
=======================
Remote


Severity:
=========
Medium


Details:
========
Multiple input validation vulnerabilities (non-persistent) are detected in the FortiGates UTM Appliance Application. 
The vulnerability allows remote attackers to hijack admin/customer sessions with required user inter action (client-side). 
Successful exploitation allows to phish user accounts, hijacking sessions, redirect over client side requests or manipulate 
website context on client-side browser requests.


Vulnerable Module(s): (Non-Persistent)
            [+] Exception Handling - objusagedlg
            [+] WiFi-controller SSID - Topic
            [+] Display Message - Title & Message

Picture(s):
            ../1.png
            ../2.png


Interface - UTM WAF Web Application [Appliance]
FortiGate-5000 Series;FortiGate-3950 Series;FortiGate-3810A;FortiGate-3600A;FortiGate-3016B;FortiGate-1240B
FortiGate-800;FortiGate-620B;FortiGate-311B;FortiGate-310B;FortiGate-300A;FortiGate-224B;FortiGate-200B Series


Proof of Concept:
=================
The non-persistent vulnerability can be exploited by remote attackers with medium or high required user inter action. 
For demonstration or reproduce  ...


Code Review:   Exception Handling - objusagedlg
URL:     http://appliance.127.0.0.1:137/objusagedlg?type=220&mkey=

<div style="text-align: center;"><h2>WiFi-controller SSID "<span class="emphasized_msg">"><[EXECUTES NON-PERSISTENT SCRIPTCODE HERE!] <
</span>" is used by:</h2><div>Total References: <span id="total_refcount"></span></div><div class="info_msg"><span id="total_unused">
</span> object types that may be configured to use this object have no references (<span id="unused_toggle"></span>)</div>
<form name="search_params"><input name="type" value="220" type="hidden"><input name="mkey" value="" type="hidden">
<iframe src="objusagedlg-Dateien/hack.htm" [EXECUTES NON-PERSISTENT SCRIPTCODE HERE!]>' <"=""><input
 type="hidden" name="mkey_display" value="" /></form><div 
id="reftable-container"></div>&


Code Review:   Display Message - Title & Message
URL:     https://appliance.127.0.0.1:137/displaymessage?url=/webfilter/profile/dlg&title=

<td>">[EXECUTES NON-PERSISTENT SCRIPTCODE HERE!]' <<="" td="">
</tr>
</table></td>
</tr>
<tr>
<td class="body" height=100><table class="body"><tr><td align="center">
Notice: This is a hack by BKM<br>
</td></tr></table></td>
</tr>
<tr><td>
<table class="footer" cellpadding="0" cellspacing="0">
<tr><td>
<input class="button" type="button" value="OK" onclick="if (window.opener) { window.close(); } else if 
(parent && parent.wij_in_modal_op && parent.wij_in_modal_op()) { if (0 && 
parent.callback_handlers) parent.callback_handlers.should_call = true; parent.wij_end_modal_dialog(); } 
else { document.location='/webfilter/profile/dlg'; }">
</td></tr>
</table>
</td></tr>
</table>
</body>
</html>
</iframe></td>


PoC:
http://appliance.127.0.0.1:137/objusagedlg?type=220&mkey=<INCLUDE NON-PERSISTENT SCRIPTCODE HERE!>
https://appliance.127.0.0.1:137/displaymessage?url=/webfilter/profile/dlg&title=<INCLUDE NON-PERSISTENT SCRIPTCODE HERE!>&msg=Notice:hacking firewall 6am


Reference(s):
      ../objusagedlg.htm
      ../displaymessage.htm


Solution:
=========
Restrict the mkey, context, title and msg parameter. Parse the client side input & output listings on requests to fix 
the issue stable. Filter & restrict the input request of the exception-handling. Validate the output listing to 
patch/fix the stable client side cross site scripting vulnerability.

   * FortiOS v4.3.8 B0630
   * FortiOS v5.0 B064


Risk:
=====
The security risk of the non-persistent cross site scripting vulnerabilities are estimated as medium(-).


Credits:
========
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@vulnerability-lab.com)


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===========
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