bugtraq - Thomson TCW690 POST Password Validation Vulnerability

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Date: Sat, 19 Feb 2005 10:41:45 +0100
From: MurDoK <murdok.lnx@...il.com>
To: bugtraq@...urityfocus.com, bugs@...uritytracker.com, news@...uriteam.com,
        full-disclosure@...ts.netsys.com, vuln@...unia.com
Subject: Thomson TCW690 POST Password Validation
	Vulnerability

I found a vulnerability in this cablemodem which a malicious user inside *LAN 
can get the control of the cablemodem easily. 
This cablemodem model is given by the spanish ISP "AUNA".

Details 
======= 

Product: Thomson TCW690 cablemodem 
Affected Version: ST42.03.0a (not tested in minor versions)
Immune Version: ??? 
Security-Risk: high 
Exploit: yes 
Product-URL: 
http://www.thomson.net/EN/Home/MiniSites/BAP/Cable/ModelDetail.html?category=cab%20modem%20Eurodocsis&model=TCW690 
Vendor-URL: http://www.thomson.net/ 
Vendor-Status: informed but no response 

Description 
=========== 

The http server inside this cablemodem doesn't properly validate the supplied 
password when an user want to do some change in the configuration and sends a 
POST request. In the exploit I show how to change the admin password but you 
can also open ports, deny a user access, restore factory defaults, (all)... 
with a little changes. 

Exploit 
======= 

Attached. 

Fix 
=== 

No response from vendor. There isn't fix available.  

Vendor Status 
============== 
2005.02.06 - Bug found. 
2005.02.07 - Informed the vendor broadband@...mson.net, no response. 
2005.02.11 - Informed the vendor webmaster@...mson.net no response too. 
2005.02.19 - Public disclosure. 

View attachment "mdk_tcw690.c" of type "text/x-csrc" (2648 bytes)

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