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SonicWall Dashboard Backend Server - Client Side Cross Site Scripting Web Vulnerability

Document Title:
SonicWall Dashboard Backend Server - Client-Side Cross Site Scripting Web Vulnerability

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Product & Service Introduction:
The SonicWALL® Network Security Appliance (NSA) 2400 is a Unified Threat Management platform for small- to medium-sized 
businesses and branch sites requiring capacity and performance. The NSA 2400 integrates dual-core hardware, SonicWALL 
Reassembly-Free Deep Packet Inspection™, intrusion prevention, application control, and SSL VPN, for real-time 
protection without compromising performance.

(Copy of the Vendor Homepage: http://www.sonicwall.com/de/en/products/NSA_2400.html )

Dashboard Backend Service

Abstract Advisory Information:
The Vulnerability Laboratory Research Team discovered a client-side cross site scripting web vulnerability in the SonicWall backend servers with which firewalls communicate.

Vulnerability Disclosure Timeline:
2013-09-26:	Researcher Notification & Coordination (Benjamin Kunz Mejri)
2013-09-27:	Vendor Notification (DELL SonicWall Security Team)
2014-10-06:	Vendor Response/Feedback (DELL SonicWall Security Team)
2014-02-18:	Vendor Fix/Patch (DELL SonicWall Developer Team)
2014-03-06:	Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Exploitation Technique:

Severity Level:

Technical Details & Description:
A client-side cross site scripting web vulnerability has been discovered in the SonicWall backend web-server with which appliance firewalls communicate.
The cross site scripting web vulnerability allows an attacker to manipulate client-side browser requests through a vulnerable application module/function.

The cross site scripting vulnerability is located in the dashboard.jsp file when processing to request via GET method manipulated `sn` values. 
The injected script code executes on the client-side of the web-application in the dashboard resource checkbox listing backend.
This issue affects sonicwall backend servers with which firewalls communicate. The attack vector is non-persistent (client-side) and the request 
method is GET. The security risk of the client-side web vulnerability is estimated as low(+) with a cvss (common vulnerability scoring system) 
count of 2.0(+)|(-)2.1.

Exploitation of the client-side web vulnerability requires no privileged web-application user account but low or medium user interaction. 
Successful exploitation of the vulnerability results in session hijacking, client-side phishing, client-side external redirects, malicious
GET method requests and client-side manipulation of the vulnerable or connected module context.

Request Method(s):
				[+] [GET]

Vulnerable Module(s):
				[+] stats

Vulnerable File(s):
				[+] dashboard.jsp

Vulnerable Parameter(s):
				[+] sn

Proof of Concept (PoC):
The client-side cross site scripting web vulnerability can be exploited by remote attackers without privileged application user account and with
low or medium user interaction. For security demonstration or to reproduce the issue follow the provided information and steps below to continue.

PoC: Example
http://nsa2400.localhost:8080/stats/dashboard.jsp?sn=[CLIENT-SIDE INJECTED SCRIPT CODE VIA SN!]%3E&UI=5&vndr=sw

PoC: Module: User Monitor - Backend

Module: User Monitor - Security Dashboard

	<a href="fwl_system_status.html" class="breadcrumb">System/</a><br>
	<span class="header">Security Dashboard</span><br>
	<table border="0" cellpadding="0" cellspacing="0" width="97%">
			<td colspan="2" class="button_row_bg"><img src="images/gen5/clear.gif" height="1" width="1"></td>
			<td class="button_row_image">View:
			<input name="mode" value="g" checked="" onclick="changeMode(this.value);" type="radio">Global
			<input name="mode" value="l" onclick="changeMode(this.value);" type="radio">>"<[CLIENT-SIDE INJECTED SCRIPT CODE VIA SN!]">

--- PoC Session Logs [GET] ---
Status: 200[OK]
GET http://nsa2400.localhost:8080/stats/dashboard.jsp?sn=[CLIENT-SIDE INJECTED SCRIPT CODE VIA SN!]%3E&UI=5&vndr=sw 
Content Size[-1] 
Mime Type[text/html]
Request Headers:
User-Agent[Mozilla/5.0 (Windows NT 6.1; WOW64; rv:23.0) Gecko/20100101 Firefox/23.0]
Accept-Encoding[gzip, deflate]
Cookie[JSESSIONID=4D8814AAF02212A2D1C234F9C9192644; __utma=205917072.1209742391.1380320042.1380320042.1380320042.1; 
__utmb=205917072.8.10.1380320042; __utmc=205917072; __utmz=205917072.1380320042.1.1.utmcsr=google|utmccn=(organic)|
utmcmd=organic|utmctr=(not%20provided); s_cc=true; s_sq=%5B%5BB%5D%5D; curUrl=userMonitor.html; 
curUsr=; 77177=local; 1008=2; 1021=600; 1023=10; 1024=5; 1031=0; 1032=0; 1033=0; 1034=0; 1035=0; 1040=4; 1041=1; 1042=0; 
1043=0; 1044=0; 1045=0; 1022=true; 1007=applFolder; SessId=null; PageSeed=null]

Response Headers:
Expires[Sat, 6 May 1995 12:00:00 GMT]
Cache-Control[no-store, no-cache, must-revalidate, post-check=0, pre-check=0]
Date[Fri, 27 Sep 2013 22:16:36 GMT]

Solution - Fix & Patch:
The vulnerability can be patched by a secure parse or encode of the vulnerable sn value in the backend server application with which the firewall appliances communicates.

2014-02-18:	Vendor Fix/Patch (DELL SonicWall Developer Team)

SonicWall: This issue affects sonicwall backend servers with which firewalls communicate. Backend servers have been updated with the fix for this issue on 02/18/2014.

Security Risk:
The security risk of the client-side cross site scripting web vulnerability is estimated as low(+).

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

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