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 ([email protected])

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-
Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business
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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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