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7a69Adv#13 - USRobotics AP Wireless Denial of Service
From: Albert Puigsech Galicia <ripe () 7a69ezine org>
Date: Mon, 2 Aug 2004 07:09:44 +0200

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  7a69ezine Advisories                               7a69Adv#13
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  http://www.7a69ezine.org                            [02/08/2004]
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Title:                  USRobotics AP Wireless Denial of Service

Author:              Albert Puigsech Galicia - <ripe () 7a69ezine org>

Software:           Embedded HTTP server

Versions:           1.21h

Remote:             yes

Exploit:              yes

Severity:            High

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I. Introduction

        USRobotics is an important company that build lot of network devices, like 
modems, wireless cards or wireless access points. It builds also Robots (as 
you can see on "I, Robot" film). To get more information about this company 
you can visit the official website at http://www.usrobotics.com.



II. Description
        
        The USR808054 wireless access point may be administered using HTTP protocol, 
so the firmwire includes a little HTTP server. The last version of this 
server has a critical buffer overflow that allow malicious users on the 
network to produce a denial of service or the execution of arbitrary code.


III. Exploit

        A buffer overflow appears on HTTP version string in GET request. You can do 
the request without administrator password, so all users on the network 
allowed to connect to http port (all by default) can exploit this issue. 

        This is a exploit code using perl:

        bash ~ $ perl -e '$a = "GET / " . "A"x250 . "\r\n\r\n" ; print $a' | nc ap 80

        It crashes down the access point and disconnect all wireless users to the 
network. May be also posible (with knowledge about the architecture used by 
USRobotics) to exploit the vulnerability to execute arbitrary code and get 
total control to the device.


IV. Patch

        Not yet.


V. Timeline

19/07/2004 - Notified to spain_modemsupport () usr com
                 - No reply


VI. Extra data

        I have only tested this vulnerability on my USR808054, but other USR products 
may be also affected.




- --
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Albert Puigsech Galicia

http://www.7a69ezine.org/~apuigsech
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