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

From: Vulnerability Lab <research@vulnerability-lab.com>
To: bugtraq@securityfocus.com,bugs@securitytracker.com
Subject: 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):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

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:

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

Exploitation Technique:

Severity Level:

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

    <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" />



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

PoC: Url

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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