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W150D Wireless N 150 ADSL2 Modem Router - Cross Site Request Forgery Vulnerability

Document Title:
===============
W150D Wireless N 150 ADSL2 Modem Router - Cross Site Request Forgery 
Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1612


Release Date:
=============
2015-10-06


Vulnerability Laboratory ID (VL-ID):
====================================
1612


Common Vulnerability Scoring System:
====================================
2.4


Product & Service Introduction:
===============================
The Tenda W300D combines the function of an ADSL2+ modem, wireless router, 
switch and firewall. It supports the latest ADSL2+ standards to provide 
higher performance (up to 24Mbps downstream and 1Mbps upstream) and longer 
reach from your Internet Service Provider`s (Digital Subscriber Line 
Access Multiplexer (DSLAM). The device is also 802.11n-compliant devices that 
deliver a wireless speed of up to 300Mbps at farther range than the 
ordinary 802.11g/b products. Ideal for multiple users to go online, transfer 
large files, print, and stream stored media - all at once, all without 
wires at homes or small offices.

(Copy of the Vendor Homepage: http://www.tenda.cn/uk/product/W300D.html  &  
http://www.tenda.cn/uk/services/downlist-389.html )


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a remote cross 
site request forgery issue in the official W150D wireless N 150 ADSL2+ Modem 
Routers.


Vulnerability Disclosure Timeline:
==================================
2015-10-06:     Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Tenda - CN
Product: Modem Router - (Wireless) W150D Wireless N 150 ADSL2+


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


Severity Level:
===============
Low


Technical Details & Description:
================================
A cross site request forgery web vulnerability has been discovered in the 
official W150D wireless N 150 ADSL2+ Modem Routers.
The vulnerability allows remote attackers to manipulate client-side 
web-application to browser requests to compromise the reouter 
by execution of system specific functions without session protection.

A remote attacker is able to delete configuration settings of Tenda Router with 
a cross site request forgery html script code. The vulnerability 
can be exploited by loading embedded html code in a site or page. The issue can 
also be exploited by attackers to external redirect an user account 
to malicious webpages. The issue requires medium user interaction in case of 
exploitation. The request method to execute is GET and the attack vector 
is located on the client-side of the router firmware.

The security risk of the cross site request forgery web vulnerability is 
estimated as low with a cvss (common vulnerability scoring system) count of 
2.4. 
Exploitation of the cross site request forgery web vulnerability requires no 
privilege web application user account and medium or high user interaction. 
Successful exploitation results in client-side account theft by client-side 
phishing, client-side external redirects and non-persistent manipulation of 
application functions that are in use.


Proof of Concept (PoC):
=======================
The vulnerability can be exploited by remote attackers without privilege 
application user account and with medium or high 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. Install the router and login to the interface
1. Now inject or use the html code and add a valid cloned mac address via smac 
to url
2. When the user of the router opens the html code in site or other type of 
redirection. Router configuration will be erased!
4. Successful reproduce of the cross site request forgery vulnerability!

PoC: Exploitcode
<html>
  <body>

    <form 
action="http://localhost/dslatmTenda.cmd?action=add&mode=0&atmVpi=&atmVci=&provider=0&province=0&city=0&zone=0&pppUserName=&pppPassword=&wlSsid=&wlWpaPsk=&clonemac=00:e0:13:20:5f:89&sessionKey=161947387";>
      <input type="submit" value="Submit form" />

    </form>

  </body>

</html>
 
Note: By loading this html code all ppoe configuration will be erased and the 
router becomes finally misconfigured!


PoC: Url
http://localhost/dslatmTenda.cmd?action=add&mode=0&atmVpi=&atmVci=&provider=0&province=0&city=0&zone=0&pppUserName=&pppPassword=&wlSsid=&wlWpaPsk=&clonemac=00:e0:13:20:5f:89&sessionKey=161947387


Security Risk:
==============
The security risk of the cross site request forgery web vulnerability in the 
firmware of the router is estimated as low. (CVSS 2.4)


Credits & Authors:
==================
Lawrence Amer - ( 
http://www.vulnerability-lab.com/show.php?user=Lawrence%20Amer )


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