Full Disclosure: Barracuda SSL VPN 680 2.2.2.203 - Redirect Vulnerability

[Vulnerability Lab <research () vulnerability-lab com>]

Title:
======
Barracuda SSL VPN 680 2.2.2.203 - Redirect Vulnerability


Date:
=====
2013-05-25


References:
===========
http://www.vulnerability-lab.com/get_content.php?id=755

Barracuda Networks Security ID (BNSEC): 727


VL-ID:
=====
755


Common Vulnerability Scoring System:
====================================
1.3


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 a redirect vulnerability in the official Barracuda Networks SSL 
VPN 680 v2.2.2.203.


Report-Timeline:
================
2012-11-11:     Researcher Notification & Coordination (Benjamin Kunz Mejri)
2012-11-12:     Vendor Notification (Barracuda Networks - Security Incident Team)
2012-11-19:     Vendor Response/Feedback (Barracuda Networks - Dave Farrow)
2013-03-07:     Vendor Fix/Patch - (Update to version 2.3.3.193)
2012-05-27:     Public Disclosure (Vulnerability Laboratory)


Status:
========
Published


Affected Products:
==================
Barracuda Networks
Product: SSL VPN 680 2.2.2.203


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


Severity:
=========
Low


Details:
========
A remote redirection (external) vulnerability is detected in the Barracuda SSL VPN 680 v2.2.2.203 (Vx) Web Application 
Appliance.
The bug allows remote attackers to prepare links to client side external redirects with malware, phishing websites or 
malicious 
web context. 

The vulnerability is located in the resourceId parameter request when processing to load an internal returnTo file 
redirect.

The vulnerability can be exploited by remote attackers without privilege application user account and with low user 
interaction.
Successful exploitation of the vulnerability result in an unauthorized client side redirect to malicious external 
websites or servers. 

Vulnerable Module(s):
                                [+] launchApplication.do [resourceId]

Vulnerable Parameter(s):
                                [+] returnTo


Proof of Concept:
=================
The vulnerability can be exploited by remote attacker without privileged application user account but with medium or
high required user inter action. For demonstration or reproduce ...

1.1
The first url shows the standard request via GET request
https://sslvpn.127.0.0.1:8080/launchApplication.do?resourceId=1&policy=1&returnTo=%2FshowApplicationShortcuts.do

1.2
The secound url shows the manipulated remote context via GET request
https://sslvpn.127.0.0.1:8080/launchApplication.do?resourceId=1&policy=1&returnTo=http://www.vulnerability-lab.com

https://sslvpn.[SERVER]/[FILE].do?[RES+ID]=x&[POLICY]=x&returnTo=[EXTERNAL TARGET]


Solution:
=========
The vulnerability can be patched by allowing only local file requests when processing to load the vulnerable returnTo 
parameter via GET.

2013-03-07:     Vendor Fix/Patch - 2.3.3.193


Risk:
=====
The security risk of the redirection vulnerability is estimated as low(+).


Credits:
========
Vulnerability Laboratory [Research Team]  -    Chokri Ben Achour (meister () vulnerability-lab com)


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===========
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                                        Copyright © 2013 | Vulnerability Laboratory




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