AG公司云
【威胁通告】微软12月清静更新多个产品高危误差通告
2021-12-16
一. 误差概述
12月15日，AG公司科技CERT监测到微软宣布12月清静更新补丁，修复了67个清静问题，涉及Windows、Microsoft Office、Microsoft Visual Studio、Microsoft PowerShell等普遍使用的产品，其中包括权限提升、远程代码执行等高危误差类型。
本月微软月度更新修复的误差中，严重水平为要害（Critical）的误差有7个，主要（Important）误差有60个，其中包括6个0day误差：
Windows AppX Installer诱骗误差(CVE-2021-43890)
NTFS Set Short Name权限提升误差（CVE-2021-43240）
Windows Print Spooler权限提升误差（CVE-2021-41333）
Windows Mobile Device Management权限提升误差（CVE-2021-43880）
Windows Installer权限提升误差（CVE-2021-43883）
Windows Encrypting File System (EFS) 权限提升误差（CVE-2021-43893）
请相关用户尽快更新补丁举行防护，完整误差列表请参考附录。
AG公司远程清静评估系统（RSAS）已具备微软此次补丁更新中大部分误差的检测能力（包括CVE-2021-41333、CVE-2021-43880、CVE-2021-43883、CVE-2021-43233、CVE-2021-43893等高危误差），请相关用户实时将AG公司远程清静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. 重点误差简述
凭证产品盛行度和误差主要性筛选出此次更新中包括影响较大的误差，请相关用户重点举行关注：
Windows AppX Installer诱骗误差（CVE-2021-43890）：
攻击者可通过制作恶意的数据包，当乐成诱导用户在受影响的系统上翻开恶意文件后，拥有低权限的攻击者可实现权限提升，导致在目的系统上以用户权限执行恣意代码。现在该误差已监测到在野使用，正在被武器化用来撒播 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权限提升误差（CVE-2021-43883）：
该误差为Windows Installer权限提升误差（CVE-2021-41379）的补丁绕过。通俗用户权限的外地攻击者可使用该误差提升至SYSTEM 权限。AG公司科技CERT已针对CVE-2021-41379于11月24日宣布清静通告。
官方通告链接：
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-43883
iSNS Server内存损坏误差（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使用该误差向iSNS Server发送特制恶意请求，最终导致在目的服务器上执行恣意代码，CVSS评分9.8。
官方通告链接：
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-43215
Microsoft Office app远程代码执行误差（CVE-2021-43905）：
攻击者可通过制作恶意的数据包，当乐成诱导用户在受影响的系统上翻开恶意文件后，可导致在目的系统上以用户权限执行恣意代码，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远程代码执行误差（CVE-2021-43233）：
攻击者可以通过社会工程、DNS 中毒或MITM手艺来诱导受害者与已被控制的服务器相毗连 ；除此以外，攻击者还可以破损正当服务器，在服务器上托管恶意代码，然后期待用户毗连。乐成使用该误差，可导致攻击者在目的系统上执行恣意代码，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权限提升误差（CVE-2021-41333）：
经由身份验证的外地攻击者使用该误差在目的系统上以SYSTEM权限执行恣意代码，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 远程代码执行误差（CVE-2021-43907）：
Visual Studio Code WSL 扩展组件受该误差影响。未经身份验证的攻击者使用该误差可在目的系统以用户权限执行恣意代码，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远程代码执行误差（CVE-2021-43899）：
未经身份验证的攻击者使用该误差向目的系统发送特制的数据包，最终导致在目的系统上以用户权限执行恣意代码，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远程代码执行误差（CVE-2021-42310）：
在密码重置请求中，由于中心证书与装备内置的根CA证书两者链接历程保存缺陷，攻击者可使用该缺陷重置他人密码，最终导致在目的系统上以用户权限执行恣意代码，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)远程代码执行误差（CVE-2021-43217）：
加密文件系统(EFS)是一个基于数字认证的加密方法，它允许用户可以仅针对单个文件或者单个文件夹举行加密，以� ；な莸纳衩匦浴９セ髡呖墒褂酶梦蟛钤斐苫撼迩绯�，从而导致执行恣意代码，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权限提升误差（CVE-2021-43880）：
通俗用户权限的外地攻击者可使用该误差提升至SYSTEM 权限，AG公司科技CERT已针对该误差于11月24日宣布清静通告。
官方通告链接：
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-43880
三. 影响规模
以下为重点关注误差的受影响产品版本，其他误差影响产品规模请参阅官方通告链接。
|
误差编号 |
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. 误差防护
4.1 补丁更新
现在微软官方已针对受支持的产品版本宣布了修复以上误差的清静补丁，强烈建议受影响用户尽快装置补丁举行防护，官方下载链接：
https://msrc.microsoft.com/update-guide/en-us/releaseNote/2021-Dec
注：由于网络问题、盘算机情形问题等缘故原由，Windows Update的补丁更新可能泛起失败。用户在装置补丁后，应实时检查补丁是否乐成更新。
右键点击Windows图标，选择“设置(N)”，选择“更新和清静”-“Windows更新”，审查该页面上的提醒信息，也可点击“审查更新历史纪录”审查历史更新情形。
针对未乐成装置的更新，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”网站下载自力程序包并装置。
