一、漏洞概述
12月15日，绿盟科技CERT监测到微软发布12月安全更新补丁，修复了67个安全问题，涉及Windows、Microsoft Office、Microsoft Visual Studio、Microsoft PowerShell等广泛使用的产品，其中包括权限提升、远程代码执行等高危漏洞类型。
本月微软月度更新修复的漏洞中，严重程度为关键（Critical）的漏洞有7个，重要（Important）漏洞有60个，其中包括6个0day漏洞：
Windows AppX Installer欺骗漏洞(CVE-2021-43890)
NTFS Set Short Name权限提升漏洞（CVE-2021-43240）
Windows Print Spooler权限提升漏洞（CVE-2021-41333）
Windows Mobile Device Management权限提升漏洞（CVE-2021-43880）
Windows Installer权限提升漏洞（CVE-2021-43883）
Windows Encrypting File System (EFS) 权限提升漏洞（CVE-2021-43893）
请相关用户尽快更新补丁进行防护，完整漏洞列表请参考附录。
绿盟远程安全评估系统（RSAS）已具备微软此次补丁更新中大部分漏洞的检测能力（包括CVE-2021-41333、CVE-2021-43880、CVE-2021-43883、CVE-2021-43233、CVE-2021-43893等高危漏洞），请相关用户及时将绿盟远程安全评估系统插件升级包更新至V6.0R02F01.2510，官网链接：http://update.nsfocus.com/update/listRsasDetail/v/vulsys
参考链接：
https://msrc.microsoft.com/update-guide/en-us/releaseNote/2021-Dec
二、重点漏洞简述
根据产品流行度和漏洞重要性筛选出此次更新中包含影响较大的漏洞，请相关用户重点进行关注：
Windows AppX Installer欺骗漏洞（CVE-2021-43890）：
攻击者可通过制作恶意的数据包，当成功诱导用户在受影响的系统上打开恶意文件后，拥有低权限的攻击者可实现权限提升，导致在目标系统上以用户权限执行任意代码。目前该漏洞已监测到在野利用，正在被武器化用来传播 Emotet、Trickbot、Bazaloader等恶意软件。
官方通告链接：
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-43890
Windows Installer权限提升漏洞（CVE-2021-43883）：
该漏洞为Windows Installer权限提升漏洞（CVE-2021-41379）的补丁绕过。普通用户权限的本地攻击者可利用该漏洞提升至SYSTEM 权限。绿盟科技CERT已针对CVE-2021-41379于11月24日发布安全通告。
官方通告链接：
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-43883
iSNS Server内存损坏漏洞（CVE-2021-43215）：
Internet 存储名称服务 (iSNS) 协议用于 iSNS 服务器和 iSNS 客户端之间的交互。未经身份验证的攻击者利用该漏洞向iSNS Server发送特制恶意请求，最终导致在目标服务器上执行任意代码，CVSS评分9.8。
官方通告链接：
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-43215
Microsoft Office app远程代码执行漏洞（CVE-2021-43905）：
攻击者可通过制作恶意的数据包，当成功诱导用户在受影响的系统上打开恶意文件后，可导致在目标系统上以用户权限执行任意代码，CVSS评分9.6。
官方通告链接：
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-43905
Remote Desktop Client远程代码执行漏洞（CVE-2021-43233）：
攻击者可以通过社会工程、DNS 中毒或MITM技术来诱导受害者与已被控制的服务器相连接；除此以外，攻击者还可以破坏合法服务器，在服务器上托管恶意代码，然后等待用户连接。成功利用该漏洞，可导致攻击者在目标系统上执行任意代码，CVSS评分7.0。
官方通告链接：
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-43233
Windows Print Spooler权限提升漏洞（CVE-2021-41333）：
经过身份验证的本地攻击者利用该漏洞在目标系统上以SYSTEM权限执行任意代码，CVSS评分7.8。
官方通告链接：
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-41333
Visual Studio Code WSL Extension 远程代码执行漏洞（CVE-2021-43907）：
Visual Studio Code WSL 扩展组件受该漏洞影响。未经身份验证的攻击者利用该漏洞可在目标系统以用户权限执行任意代码，且无需用户交互，CVSS评分9.8。
官方通告链接：
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-43907
Microsoft 4K Wireless Display Adapter远程代码执行漏洞（CVE-2021-43899）：
未经身份验证的攻击者利用该漏洞向目标系统发送特制的数据包，最终导致在目标系统上以用户权限执行任意代码，且无需用户交互，CVSS评分9.8。
官方通告链接：
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-43899
Microsoft Defender for IoT远程代码执行漏洞（CVE-2021-42310）：
在密码重置请求中，由于中间证书与设备内置的根CA证书两者链接过程存在缺陷，攻击者可利用该缺陷重置他人密码，最终导致在目标系统上以用户权限执行任意代码，CVSS评分8.1。
官方通告链接：
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-42310
Windows Encrypting File System (EFS)远程代码执行漏洞（CVE-2021-43217）：
加密文件系统(EFS)是一个基于数字认证的加密方式，它允许用户可以仅针对单个文件或者单个文件夹进行加密，以保护数据的机密性。攻击者可利用该漏洞造成缓冲区溢出，从而导致执行任意代码，CVSS评分8.1。
官方通告链接：
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-43217
Windows Mobile Device Management权限提升漏洞（CVE-2021-43880）：
普通用户权限的本地攻击者可利用该漏洞提升至SYSTEM 权限，绿盟科技CERT已针对该漏洞于11月24日发布安全通告。
官方通告链接：
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-43880
三、影响范围
以下为重点关注漏洞的受影响产品版本，其他漏洞影响产品范围请参阅官方通告链接。
| 漏洞编号 | 受影响产品版本 |
| CVE-2021-43890 | App Installer |
| CVE-2021-43883 CVE-2021-41333 | Windows Server 2012 R2 (Server Core installation) Windows Server 2012 R2 Windows Server 2012 (Server Core installation) Windows Server 2012 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) Windows Server 2008 R2 for x64-based Systems Service Pack 1 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) Windows Server 2008 for x64-based Systems Service Pack 2 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) Windows Server 2008 for 32-bit Systems Service Pack 2 Windows 8.1 for x64-based systems Windows 8.1 for 32-bit systems Windows 7 for x64-based Systems Service Pack 1 Windows 7 for 32-bit Systems Service Pack 1 Windows RT 8.1 Windows Server 2016 (Server Core installation) Windows Server 2016 Windows 10 Version 1607 for x64-based Systems Windows 10 Version 1607 for 32-bit Systems Windows 10 for x64-based Systems Windows 10 for 32-bit Systems Windows 10 Version 21H2 for x64-based Systems Windows 10 Version 21H2 for ARM64-based Systems Windows 10 Version 21H2 for 32-bit Systems Windows 11 for ARM64-based Systems Windows 11 for x64-based Systems Windows Server, version 20H2 (Server Core Installation) Windows 10 Version 20H2 for ARM64-based Systems Windows 10 Version 20H2 for 32-bit Systems Windows 10 Version 20H2 for x64-based Systems Windows Server, version 2004 (Server Core installation) Windows 10 Version 2004 for x64-based Systems Windows 10 Version 2004 for ARM64-based Systems Windows 10 Version 2004 for 32-bit Systems Windows Server 2022 (Server Core installation) Windows Server 2022 Windows 10 Version 21H1 for 32-bit Systems Windows 10 Version 21H1 for ARM64-based Systems Windows 10 Version 21H1 for x64-based Systems Windows 10 Version 1909 for ARM64-based Systems Windows 10 Version 1909 for x64-based Systems Windows 10 Version 1909 for 32-bit Systems Windows Server 2019 (Server Core installation) Windows Server 2019 Windows 10 Version 1809 for ARM64-based Systems Windows 10 Version 1809 for x64-based Systems Windows 10 Version 1809 for 32-bit Systems |
| CVE-2021-43215 | Windows Server 2012 R2 (Server Core installation) Windows Server 2012 R2 Windows Server 2012 (Server Core installation) Windows Server 2012 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) Windows Server 2008 R2 for x64-based Systems Service Pack 1 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) Windows Server 2008 for x64-based Systems Service Pack 2 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) Windows Server 2008 for 32-bit Systems Service Pack 2 Windows RT 8.1 Windows 8.1 for x64-based systems Windows 8.1 for 32-bit systems Windows 7 for x64-based Systems Service Pack 1 Windows 7 for 32-bit Systems Service Pack 1 Windows Server 2016 (Server Core installation) Windows Server 2016 Windows 10 Version 1607 for x64-based Systems Windows 10 Version 1607 for 32-bit Systems Windows 10 for x64-based Systems Windows 10 for 32-bit Systems Windows 10 Version 21H2 for x64-based Systems Windows 10 Version 21H2 for ARM64-based Systems Windows 10 Version 21H2 for 32-bit Systems Windows Server, version 20H2 (Server Core Installation) Windows 10 Version 20H2 for ARM64-based Systems Windows 10 Version 20H2 for 32-bit Systems Windows 10 Version 20H2 for x64-based Systems Windows Server, version 2004 (Server Core installation) Windows 10 Version 2004 for x64-based Systems Windows 10 Version 2004 for ARM64-based Systems Windows 10 Version 2004 for 32-bit Systems Windows 10 Version 21H1 for 32-bit Systems Windows 10 Version 21H1 for ARM64-based Systems Windows 10 Version 21H1 for x64-based Systems Windows 10 Version 1909 for ARM64-based Systems Windows 10 Version 1909 for x64-based Systems Windows 10 Version 1909 for 32-bit Systems Windows Server 2019 (Server Core installation) Windows Server 2019 Windows 10 Version 1809 for ARM64-based Systems Windows 10 Version 1809 for x64-based Systems Windows 10 Version 1809 for 32-bit Systems |
| CVE-2021-43905 | Office app |
| CVE-2021-43233 | Windows Server 2012 R2 (Server Core installation) Windows Server 2012 R2 Windows Server 2012 (Server Core installation) Windows Server 2012 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) Windows Server 2008 R2 for x64-based Systems Service Pack 1 Windows RT 8.1 Windows 8.1 for x64-based systems Windows 8.1 for 32-bit systems Windows 7 for x64-based Systems Service Pack 1 Windows 7 for 32-bit Systems Service Pack 1 Windows Server 2016 (Server Core installation) Windows Server 2016 Windows 10 Version 1607 for x64-based Systems Windows 10 Version 1607 for 32-bit Systems Windows 10 for x64-based Systems Windows 10 for 32-bit Systems Windows 10 Version 21H2 for x64-based Systems Windows 10 Version 21H2 for ARM64-based Systems Windows 10 Version 21H2 for 32-bit Systems Windows 11 for ARM64-based Systems Windows 11 for x64-based Systems Windows Server, version 20H2 (Server Core Installation) Windows 10 Version 20H2 for ARM64-based Systems Windows 10 Version 20H2 for 32-bit Systems Windows 10 Version 20H2 for x64-based Systems Windows Server, version 2004 (Server Core installation) Windows 10 Version 2004 for x64-based Systems Windows 10 Version 2004 for ARM64-based Systems Windows 10 Version 2004 for 32-bit Systems Windows Server 2022 (Server Core installation) Windows Server 2022 Windows 10 Version 21H1 for 32-bit Systems Windows 10 Version 21H1 for ARM64-based Systems Windows 10 Version 21H1 for x64-based Systems Windows 10 Version 1909 for ARM64-based Systems Windows 10 Version 1909 for x64-based Systems Windows 10 Version 1909 for 32-bit Systems Windows Server 2019 (Server Core installation) Windows Server 2019 Windows 10 Version 1809 for ARM64-based Systems Windows 10 Version 1809 for x64-based Systems Windows 10 Version 1809 for 32-bit Systems |
| CVE-2021-43907 | Visual Studio Code WSL Extension |
| CVE-2021-43899 | Microsoft 4K Wireless Display Adapter |
| CVE-2021-42310 | Microsoft Defender for IoT |
| CVE-2021-43217 | Windows Server 2012 R2 (Server Core installation) Windows Server 2012 R2 Windows Server 2012 (Server Core installation) Windows Server 2012 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) Windows Server 2008 R2 for x64-based Systems Service Pack 1 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) Windows Server 2008 for x64-based Systems Service Pack 2 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) Windows Server 2008 for 32-bit Systems Service Pack 2 Windows RT 8.1 Windows 8.1 for x64-based systems Windows 8.1 for 32-bit systems Windows 7 for x64-based Systems Service Pack 1 Windows 7 for 32-bit Systems Service Pack 1 Windows Server 2016 (Server Core installation) Windows Server 2016 Windows 10 Version 1607 for x64-based Systems Windows 10 Version 1607 for 32-bit Systems Windows 10 for x64-based Systems Windows 10 for 32-bit Systems Windows 10 Version 21H2 for x64-based Systems Windows 10 Version 21H2 for ARM64-based Systems Windows 10 Version 21H2 for 32-bit Systems Windows 11 for ARM64-based Systems Windows 11 for x64-based Systems Windows Server, version 20H2 (Server Core Installation) Windows 10 Version 20H2 for ARM64-based Systems Windows 10 Version 20H2 for 32-bit Systems Windows 10 Version 20H2 for x64-based Systems Windows Server, version 2004 (Server Core installation) Windows 10 Version 2004 for x64-based Systems Windows 10 Version 2004 for ARM64-based Systems Windows 10 Version 2004 for 32-bit Systems Windows Server 2022 (Server Core installation) Windows Server 2022 Windows 10 Version 21H1 for 32-bit Systems Windows 10 Version 21H1 for ARM64-based Systems Windows 10 Version 21H1 for x64-based Systems Windows 10 Version 1909 for ARM64-based Systems Windows 10 Version 1909 for x64-based Systems Windows 10 Version 1909 for 32-bit Systems Windows Server 2019 (Server Core installation) Windows Server 2019 Windows 10 Version 1809 for ARM64-based Systems Windows 10 Version 1809 for x64-based Systems Windows 10 Version 1809 for 32-bit Systems |
| CVE-2021-43880 | Windows 11 for ARM64-based Systems Windows 11 for x64-based Systems |
四、漏洞防护
目前微软官方已针对受支持的产品版本发布了修复以上漏洞的安全补丁，强烈建议受影响用户尽快安装补丁进行防护，官方下载链接：
https://msrc.microsoft.com/update-guide/en-us/releaseNote/2021-Dec
注：由于网络问题、计算机环境问题等原因，Windows Update的补丁更新可能出现失败。用户在安装补丁后，应及时检查补丁是否成功更新。
右键点击Windows图标，选择“设置(N)”，选择“更新和安全”-“Windows更新”，查看该页面上的提示信息，也可点击“查看更新历史记录”查看历史更新情况。
针对未成功安装的更新，可点击更新名称跳转到微软官方下载页面，建议用户点击该页面上的链接，转到“Microsoft更新目录”网站下载独立程序包并安装。
附录：漏洞列表
| 影响产品 | CVE编号 | 漏洞标题 | 严重程度 |
| System Center | CVE-2021-42310 | Microsoft Defender for IoT 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-43215 | iSNS Server Memory Corruption Vulnerability Can Lead to Remote Code Execution | Critical |
| Windows | CVE-2021-43217 | Windows Encrypting File System (EFS) 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-43233 | Remote Desktop Client 远程代码执行漏洞 | Critical |
| Device | CVE-2021-43899 | Microsoft 4K Wireless Display Adapter 远程代码执行漏洞 | Critical |
| Apps | CVE-2021-43905 | Microsoft Office app 远程代码执行漏洞 | Critical |
| Visual Studio Code WSL Extension | CVE-2021-43907 | Visual Studio Code WSL Extension 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-40441 | Windows Media Center 权限提升漏洞 | Important |
| Windows | CVE-2021-40452 | HEVC Video Extensions 远程代码执行漏洞 | Important |
| Windows | CVE-2021-40453 | HEVC Video Extensions 远程代码执行漏洞 | Important |
| Windows | CVE-2021-41333 | Windows Print Spooler 权限提升漏洞 | Important |
| Windows | CVE-2021-41360 | HEVC Video Extensions 远程代码执行漏洞 | Important |
| System Center | CVE-2021-41365 | Microsoft Defender for IoT 远程代码执行漏洞 | Important |
| Microsoft Office | CVE-2021-42293 | Microsoft Jet Red Database Engine and Access Connectivity Engine 权限提升漏洞 | Important |
| Microsoft Office | CVE-2021-42294 | Microsoft SharePoint Server 远程代码执行漏洞 | Important |
| Microsoft Office | CVE-2021-42295 | Visual Basic for Applications 信息披露漏洞 | Important |
| Microsoft Office | CVE-2021-42309 | Microsoft SharePoint Server 远程代码执行漏洞 | Important |
| System Center | CVE-2021-42311 | Microsoft Defender for IoT 远程代码执行漏洞 | Important |
| System Center | CVE-2021-42312 | Microsoft Defender for IOT 权限提升漏洞 | Important |
| System Center | CVE-2021-42313 | Microsoft Defender for IoT 远程代码执行漏洞 | Important |
| System Center | CVE-2021-42314 | Microsoft Defender for IoT 远程代码执行漏洞 | Important |
| System Center | CVE-2021-42315 | Microsoft Defender for IoT 远程代码执行漏洞 | Important |
| Microsoft Office | CVE-2021-42320 | Microsoft SharePoint Server 欺骗漏洞 | Important |
| Windows | CVE-2021-43207 | Windows Common Log File System Driver 权限提升漏洞 | Important |
| Windows | CVE-2021-43214 | Web Media Extensions 远程代码执行漏洞 | Important |
| Windows | CVE-2021-43216 | Microsoft Local Security Authority Server (lsasrv) 信息披露漏洞 | Important |
| Windows | CVE-2021-43219 | DirectX Graphics Kernel File 拒绝服务漏洞 | Important |
| Windows | CVE-2021-43222 | Microsoft Message Queuing 信息披露漏洞 | Important |
| Windows | CVE-2021-43223 | Windows Remote Access Connection Manager 权限提升漏洞 | Important |
| Windows | CVE-2021-43224 | Windows Common Log File System Driver 信息披露漏洞 | Important |
| Bot Framework SDK for .NET Framework | CVE-2021-43225 | Bot Framework SDK 远程代码执行漏洞 | Important |
| Windows | CVE-2021-43226 | Windows Common Log File System Driver 权限提升漏洞 | Important |
| Windows | CVE-2021-43227 | Storage Spaces Controller 信息披露漏洞 | Important |
| Windows | CVE-2021-43228 | SymCrypt 拒绝服务漏洞 | Important |
| Windows | CVE-2021-43229 | Windows NTFS 权限提升漏洞 | Important |
| Windows | CVE-2021-43230 | Windows NTFS 权限提升漏洞 | Important |
| Windows | CVE-2021-43231 | Windows NTFS 权限提升漏洞 | Important |
| Windows | CVE-2021-43232 | Windows Event Tracing 远程代码执行漏洞 | Important |
| Windows | CVE-2021-43234 | Windows Fax Service 远程代码执行漏洞 | Important |
| Windows | CVE-2021-43235 | Storage Spaces Controller 信息披露漏洞 | Important |
| Windows | CVE-2021-43236 | Microsoft Message Queuing 信息披露漏洞 | Important |
| Windows | CVE-2021-43237 | Windows Setup 权限提升漏洞 | Important |
| Windows | CVE-2021-43238 | Windows Remote Access 权限提升漏洞 | Important |
| Windows | CVE-2021-43239 | Windows Recovery Environment Agent 权限提升漏洞 | Important |
| Windows | CVE-2021-43240 | NTFS Set Short Name 权限提升漏洞 | Important |
| Microsoft Office | CVE-2021-43242 | Microsoft SharePoint Server 欺骗漏洞 | Important |
| Windows | CVE-2021-43243 | VP9 Video Extensions 信息披露漏洞 | Important |
| Windows | CVE-2021-43244 | Windows Kernel 信息披露漏洞 | Important |
| Windows | CVE-2021-43245 | Windows Digital TV Tuner 权限提升漏洞 | Important |
| Windows | CVE-2021-43246 | Windows Hyper-V 拒绝服务漏洞 | Important |
| Windows | CVE-2021-43247 | Windows TCP/IP Driver 权限提升漏洞 | Important |
| Windows | CVE-2021-43248 | Windows Digital Media Receiver 权限提升漏洞 | Important |
| Microsoft Office | CVE-2021-43255 | Microsoft Office Trust Center 欺骗漏洞 | Important |
| Microsoft Office | CVE-2021-43256 | Microsoft Excel 远程代码执行漏洞 | Important |
| Microsoft Office | CVE-2021-43875 | Microsoft Office Graphics 远程代码执行漏洞 | Important |
| ASP.NET Core,Microsoft Visual Studio | CVE-2021-43877 | ASP.NET Core and Visual Studio 权限提升漏洞 | Important |
| Windows | CVE-2021-43880 | Windows Mobile Device Management 权限提升漏洞 | Important |
| System Center | CVE-2021-43882 | Microsoft Defender for IoT 远程代码执行漏洞 | Important |
| Windows | CVE-2021-43883 | Windows Installer 权限提升漏洞 | Important |
| System Center | CVE-2021-43888 | Microsoft Defender for IoT 信息披露漏洞 | Important |
| System Center | CVE-2021-43889 | Microsoft Defender for IoT 远程代码执行漏洞 | Important |
| Apps | CVE-2021-43890 | Windows AppX Installer 欺骗漏洞 | Important |
| Visual Studio Code | CVE-2021-43891 | Visual Studio Code 远程代码执行漏洞 | Important |
| Microsoft BizTalk ESB Toolkit | CVE-2021-43892 | Microsoft BizTalk ESB Toolkit 欺骗漏洞 | Important |
| Windows | CVE-2021-43893 | Windows Encrypting File System (EFS) 权限提升漏洞 | Important |
| PowerShell | CVE-2021-43896 | Microsoft PowerShell 欺骗漏洞 | Important |
| Visual Studio Code | CVE-2021-43908 | Visual Studio Code 欺骗漏洞 | Important |
声明
本安全公告仅用来描述可能存在的安全问题，绿盟科技不为此安全公告提供任何保证或承诺。由于传播、利用此安全公告所提供的信息而造成的任何直接或者间接的后果及损失，均由使用者本人负责，绿盟科技以及安全公告作者不为此承担任何责任。
绿盟科技拥有对此安全公告的修改和解释权。如欲转载或传播此安全公告，必须保证此安全公告的完整性，包括版权声明等全部内容。未经绿盟科技允许，不得任意修改或者增减此安全公告内容，不得以任何方式将其用于商业目的。