Barracuda SSL VPN 680 - Cross Site Scripting Vulnerabilities

[Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>]

Title:
======
Barracuda SSL VPN 680 - Cross Site Scripting Vulnerabilities


Date:
=====
2012-07-16


References:
===========
http://vulnerability-lab.com/get_content.php?id=561

Barracuda Networks Security ID: BNSEC-278


VL-ID:
=====
561


Common Vulnerability Scoring System:
====================================
3


Introduction:
=============
The Barracuda SSL VPN is an integrated hardware and software solution enabling 
secure, clientless remote 
access to internal network resources from any Web browser. Designed for remote 
employees and road warriors, 
the Barracuda SSL VPN provides comprehensive control over file systems and 
Web-based applications requiring 
external access. The Barracuda SSL VPN integrates with third-party 
authentication mechanisms to control user 
access levels and provides single sign-on. 

Barracuda SSL VPN       

    * Enables access to corporate intranets, file systems or other Web-based 
applications
    * Tracks resource access through auditing and reporting facilities
    * Scans uploaded files for viruses and malware
    * Leverages multi-factor, layered authentication mechanisms, including RSA 
SecurID and VASCO tokens
    * Integrates with existing Active Directory and LDAP directories
    * Utilizes policies for granular access control framework
    * Supports any Web browser on PC or Mac

(Copy of the Vendor Homepage: 
http://www.barracudanetworks.com/ns/products/sslvpn.php)


Abstract:
=========
The Vulnerability Laboratory Research Team discovered multiple Web 
Vulnerabilities in the Barracuda  SSL VPN 680 appliance application.


Report-Timeline:
================
2012-06-09:     Researcher Notification & Coordination
2012-06-10:     Vendor Notification
2012-07-12:     Vendor Response/Feedback
2012-07-14:     Vendor Fix/Patch
2012-07-16:     Public Disclosure


Status:
========
Published


Affected Products:
==================
Barracuda Networks
Product: SSL VPN Appliance v680 - 2.2.2.115


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


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


Details:
========
Multiple non persistent cross site scripting vulnerabilities are detected in 
Barracuda SSL VPN 680 v2.2.2.115 appliance application.
The vulnerability allows remote attackers to hijack website customer, moderator 
or admin sessions with high required 
user inter action. The bugs are located in the fileSystem.do, 
showUserResourceCategories.do,launchAgent.do files with the bound 
vulnerable  policyLaunching, resourcePrefix, path & return-To parameters. 
Successful exploitation can result in account steal, 
phishing & client-side content request manipulation.

Vulnerable Module(s):
                                [+] 
showUserResourceCategories.do&messageResourcesKey=resourceCategory
                                [+] 
fileSystem.do?launchId=l52ca6d&actionTarget=list&path=
                                [+] launchAgent.do

Vulnerable Parameter(s):
                                [+] policyLaunching & resourcePrefix
                                [+] list&path
                                [+] return-To


Proof of Concept:
=================
The client side cross site scripting vulnerabilities can be exploited by remote 
attackers with medium or high required user inter action.
For demonstration or reproduce ...

1.1
https://sslvpn.[SERVER]/resourceList.do?form=resourceCategoriesForm&readOnly=test&path=
%2FshowUserResourceCategories.do&messageResourcesKey=resourceCategory&actionPath=[NON-PERSISTENT
 SCRIPT CODE!]


1.2
https://sslvpn.[SERVER]/[FILE].do?[VALUE #1]=l52ca6d&[VALUE #2]=[VALUE 
#3]&[PATH LISTING]=smb/Sales%20Folder/Opt/[NON-PERSISTENT SCRIPT CODE!]

PoC:
https://sslvpn.[SERVER]/fileSystem.do?launchId=l52ca6d&actionTarget=list&path=smb/Sales%20Folder/Testing
%20from%20Tri%20Opt/%22%3E%3Ciframe%20src=a%20onload=alert%28%22VL%22%29%20%3C


1.3
https://sslvpn.[SERVER]/launchAgent.do?launchId=l3ce418&returnTo=[NON-PERSISTENT
 SCRIPT CODE!]


Solution:
=========
2012-07-14:     Vendor Fix/Patch by Barracuda Networks


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@xxxxxxxxxxxxxxxxxxxxx)


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===========
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