The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
Low
C
There is some impact on confidentiality, but the attacker either does not gain control of any data, or the information obtained does not have a significant impact on the system or its operations.
Integrity
Low
I
Modification of data is possible, but the attacker does not have control over what can be modified, or the extent of what the attacker can affect is limited. The data modified does not have a direct, serious impact on the system.
Availability
None
A
There is no impact on the availability of the system; the attacker does not have the ability to disrupt access to or use of the system.
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:
===========
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