KnowSafe 安全预警：KnowSafe 安全团队监测到编号 AVD-2021-40449 的安全漏洞（危害等级：高危）已公开披露，相关用户应尽快排查并完成修复。
漏洞介绍
Microsoft Windows是一款由美国微软公司开发的窗口化操作系统。
Microsoft Win32k存在权限提升漏洞。攻击者可利用该漏洞提升权限。
受影响系统：
Microsoft Windows Server 20H2 (Server Core Insta
Microsoft Windows Server 2022 (Server Core insta
Microsoft Windows Server 2022
Microsoft Windows Server 2019 (Server Core Insta
Microsoft Windows Server 2019
Microsoft Windows Server 2016 (Server Core Insta
Microsoft Windows Server 2016
Microsoft Windows Server 2012 R2 (Server Core in
Microsoft Windows Server 2012 R2
Microsoft Windows Server 2012 (Server Core insta
Microsoft Windows Server 2012
Microsoft Windows Server 2008 R2 for x64-based S
Microsoft Windows Server 2008 R2 for x64-based S
Microsoft Windows Server 2008 for x64-based Syst
Microsoft Windows Server 2008 for x64-based Syst
Microsoft Windows Server 2008 for 32-bit Systems
Microsoft Windows Server 2008 for 32-bit Systems
Microsoft Windows Server 2004 (Server Core insta
Microsoft Windows RT 8.1
Microsoft Windows 8.1 for x64-based systems
Microsoft Windows 8.1 for 32-bit systems
Microsoft Windows 7 for x64-based Systems SP1
Microsoft Windows 7 for 32-bit Systems SP1
Microsoft Windows 10 for x64-based Systems
Microsoft Windows 10 for 32-bit Systems
Microsoft Windows 10 21H1 for x64-based Systems
Microsoft Windows 10 21H1 for ARM64-based Systems
Microsoft Windows 10 21H1 for 32-bit Systems
Microsoft Windows 10 20H2 for x64-based Systems
Microsoft Windows 10 20H2 for ARM64-based Systems
Microsoft Windows 10 20H2 for 32-bit Systems
Microsoft Windows 10 2004 for x64-based Systems
Microsoft Windows 10 2004 for ARM64-based Systems
Microsoft Windows 10 2004 for 32-bit Systems
Microsoft Windows 10 1909 for x64-based Systems
Microsoft Windows 10 1909 for ARM64-based Systems
Microsoft Windows 10 1909 for 32-bit Systems
Microsoft Windows 10 1809 for x64-based Systems
Microsoft Windows 10 1809 for ARM64-based Systems
Microsoft Windows 10 1809 for 32-bit Systems
Microsoft Windows 10 1607 for x64-based Systems
Microsoft Windows 10 1607 for 32-bit Systems
Microsoft Windows 11 for x64-based Systems
Microsoft Windows 11 for ARM64-based Systems
影响范围
官方公告未列出受影响软件明细，请结合自身业务使用的组件版本进行排查。
解决方案
目前厂商已发布升级补丁以修复漏洞，补丁获取链接：
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-40449
参考信息
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-41623
https://moodle.org/mod/forum/discuss.php?d=238399
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-40449
KnowSafe 将持续跟踪该漏洞的利用情况与修复进展，如需漏洞管理与应急响应支持，欢迎联系 KnowSafe 安全团队。