Barracuda SSL VPN 680 2.2.2.203 Open Redirect

`Title:  
======  
Barracuda SSL VPN 680 2.2.2.203 - Redirect Web Vulnerability  
  
  
Date:  
=====  
2013-05-25  
  
  
References:  
===========  
http://www.vulnerability-lab.com/get_content.php?id=755  
  
Barracuda Networks Security ID (BNSEC): 731  
  
  
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  
2012-11-12: Vendor Notification  
2012-11-19: Vendor Response/Feedback  
2013-02-20: Vendor Fix/Patch  
2012-05-27: PublicDisclosure  
  
  
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 via GET method an internal `returnTo` file redirect.  
  
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.  
  
2013-02-20: Vendor Fix/Patch  
  
  
Risk:  
=====  
The security risk of the redirection vulnerability is estimated as low(+).  
  
  
Credits:  
========  
Vulnerability Laboratory [Research Team] - Chokri Ben Achour ([email protected])  
Barracuda Networks [Security Team] - Dave Farrow (Communication & Coordination)  
  
  
Disclaimer:  
===========  
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-  
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