一、漏洞概述
5月12日，微软发布5月安全更新补丁，修复了55个安全漏洞，涉及Windows、Microsoft Office、Exchange Server、Visual Studio Code、Internet Explorer等广泛使用的产品，其中包括远程代码执行和权限提升等高危漏洞类型。
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4个，重要（Important）漏洞有50个。请相关用户尽快更新补丁进行防护。详细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多数漏洞的检测能力（包括CVE-2021-26419、CVE-2021-31166、CVE-2021-31194、CVE-2021-28476等高危漏洞），请相关用户关注绿盟远程安全评估系统系统插件升级包的更新，及时升级至V6.0R02F01.2301，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-May
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：
HTTP协议栈远程代码执行漏洞（CVE-2021-31166）：
HTTP协议栈（http.sys）存在远程代码执行漏洞，未经身份验证的远程攻击者可通过向目标主机发送特制数据包来利用此漏洞，从而在目标系统上执行任意代码。CVSS评分为9.8，微软表示此漏洞可用于蠕虫式传播。
官方通告链接：https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-31166
Hyper-V 远程代码执行漏洞（CVE-2021-28476）：
虚拟机管理程序Windows Hyper-V存在远程执行代码漏洞，CVSS评分为9.9 。此漏洞使guest VM 可以强制Hyper-V host的内核读取任意可能无效的地址，在某些情况下成功利用该漏洞的攻击者可以在 Hyper-V 的服务器上运行二进制文件或在系统上执行任意代码。
官方通告链接：https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-28476
Microsoft SharePoint远程代码执行漏洞（CVE-2021-28474/CVE-2021-31181）：
经过身份认证的攻击者可通过访问创建SharePoint站点利用以上漏洞，实现在目标系统上执行任意代码。
官方通告链接：
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-28474
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-31181
OLE Automation 远程代码执行漏洞（CVE-2021-31194）：
此漏洞存在于Windows OLE中，攻击者搭建一个恶意的网站诱导用户访问，通过Web浏览器调用OLE自动化利用此漏洞，从而实现远程代码执行。
官方通告链接：https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-31194
Exchange Server 安全功能绕过漏洞（CVE-2021-31207）：
此漏洞为2021 Pwn2Own 竞赛上发现的Exchange Server漏洞之一，目前已公开披露，攻击者成功利用该漏洞可获取一定的服务器控制权限。
官方通告链接：https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-31207
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-2021-31166 | 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 |
| CVE-2021-28476 | 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 8.1 for x64-based systems Windows 7 for x64-based Systems Service Pack 1 Windows Server 2016 (Server Core installation) Windows Server 2016 Windows 10 Version 1607 for x64-based Systems Windows 10 for x64-based Systems Windows Server, version 20H2 (Server Core Installation) Windows 10 Version 20H2 for x64-based Systems Windows Server, version 2004 (Server Core installation) Windows 10 Version 2004 for x64-based Systems Windows Server, version 1909 (Server Core installation) Windows 10 Version 1909 for x64-based Systems Windows Server 2019 (Server Core installation) Windows Server 2019 Windows 10 Version 1809 for x64-based Systems Windows 10 Version 1803 for x64-based Systems |
| CVE-2021-28474 CVE-2021-31181 | Microsoft SharePoint Foundation 2013 Service Pack 1 Microsoft SharePoint Server 2019 Microsoft SharePoint Enterprise Server 2016 |
| CVE-2021-31194 | 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, version 1909 (Server Core installation) Windows 10 Version 1909 for ARM64-based Systems Windows 10 Version 20H2 for x64-based Systems Windows Server, version 2004 (Server Core installation) 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 Windows 10 Version 1803 for ARM64-based Systems Windows 10 Version 1803 for x64-based Systems Windows 10 Version 1803 for 32-bit Systems 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 Server, version 20H2 (Server Core Installation) Windows 10 Version 20H2 for ARM64-based Systems Windows 10 Version 20H2 for 32-bit Systems |
| CVE-2021-31207 | Microsoft Exchange Server 2019 Cumulative Update 8 Microsoft Exchange Server 2016 Cumulative Update 19 Microsoft Exchange Server 2016 Cumulative Update 20 Microsoft Exchange Server 2019 Cumulative Update 9 Microsoft Exchange Server 2013 Cumulative Update 23 |
四、漏洞防护
4.1 补丁更新
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-May
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 |
| Internet Explorer | CVE-2021-26419 | Scripting Engine 内存泄露漏洞 | Critical |
| Windows | CVE-2021-31166 | HTTP Protocol Stack 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-31194 | OLE Automation 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-28476 | Hyper-V 远程代码执行漏洞 | Critical |
| Windows | CVE-2020-24588 | Windows Wireless Networking 欺骗漏洞 | Important |
| Windows | CVE-2020-24587 | Windows Wireless Networking 信息披露漏洞 | Important |
| Microsoft Visual Studio | CVE-2021-27068 | Visual Studio 远程代码执行漏洞 | Important |
| Windows | CVE-2020-26144 | Windows Wireless Networking 欺骗漏洞 | Important |
| Windows,Microsoft Office | CVE-2021-28455 | Microsoft Jet Red Database Engine and Access Connectivity Engine 远程代码执行漏洞 | Important |
| Microsoft Dynamics | CVE-2021-28461 | Dynamics Finance and Operations 跨站脚本漏洞 | Important |
| Windows | CVE-2021-28479 | Windows CSC Service 信息披露漏洞 | Important |
| Windows | CVE-2021-31165 | Windows Container Manager Service 权限提升漏洞 | Important |
| Windows | CVE-2021-31167 | Windows Container Manager Service 权限提升漏洞 | Important |
| Windows | CVE-2021-31168 | Windows Container Manager Service 权限提升漏洞 | Important |
| Windows | CVE-2021-31169 | Windows Container Manager Service 权限提升漏洞 | Important |
| Windows | CVE-2021-31170 | Windows Graphics Component 权限提升漏洞 | Important |
| Microsoft Office | CVE-2021-31171 | Microsoft SharePoint 信息披露漏洞 | Important |
| Microsoft Office | CVE-2021-31172 | Microsoft SharePoint 欺骗漏洞 | Important |
| Microsoft Office | CVE-2021-31173 | Microsoft SharePoint Server 信息披露漏洞 | Important |
| Microsoft Office | CVE-2021-31174 | Microsoft Excel 信息披露漏洞 | Important |
| Microsoft Office | CVE-2021-31175 | Microsoft Office 远程代码执行漏洞 | Important |
| Microsoft Office | CVE-2021-31176 | Microsoft Office 远程代码执行漏洞 | Important |
| Microsoft Office | CVE-2021-31177 | Microsoft Office 远程代码执行漏洞 | Important |
| Microsoft Office | CVE-2021-31178 | Microsoft Office 信息披露漏洞 | Important |
| Microsoft Office | CVE-2021-31179 | Microsoft Office 远程代码执行漏洞 | Important |
| Microsoft Office | CVE-2021-31180 | Microsoft Office Graphics 远程代码执行漏洞 | Important |
| Microsoft Office | CVE-2021-31181 | Microsoft SharePoint 远程代码执行漏洞 | Important |
| Windows | CVE-2021-31182 | Microsoft Bluetooth Driver 欺骗漏洞 | Important |
| Windows | CVE-2021-31184 | Microsoft Windows Infrared Data Association (IrDA) 信息披露漏洞 | Important |
| Windows | CVE-2021-31185 | Windows Desktop Bridge 拒绝服务漏洞 | Important |
| Windows | CVE-2021-31186 | Windows Remote Desktop Protocol (RDP) 信息披露漏洞 | Important |
| Windows | CVE-2021-31187 | Windows WalletService 权限提升漏洞 | Important |
| Windows | CVE-2021-31188 | Windows Graphics Component 权限提升漏洞 | Important |
| Windows | CVE-2021-31190 | Windows Container Isolation FS Filter Driver 权限提升漏洞 | Important |
| Windows | CVE-2021-31191 | Windows Projected File System FS Filter Driver 信息披露漏洞 | Important |
| Windows | CVE-2021-31192 | Windows Media Foundation Core 远程代码执行漏洞 | Important |
| Windows | CVE-2021-31193 | Windows SSDP Service 权限提升漏洞 | Important |
| Exchange Server | CVE-2021-31195 | Microsoft Exchange Server 远程代码执行漏洞 | Important |
| Exchange Server | CVE-2021-31198 | Microsoft Exchange Server 远程代码执行漏洞 | Important |
| .NET,.NET Core,Visual Studio,Microsoft Visual Studio | CVE-2021-31204 | .NET and Visual Studio 权限提升漏洞 | Important |
| Windows | CVE-2021-31205 | Windows SMB Client 安全功能绕过漏洞 | Important |
| Windows | CVE-2021-31208 | Windows Container Manager Service 权限提升漏洞 | Important |
| Exchange Server | CVE-2021-31209 | Microsoft Exchange Server 欺骗漏洞 | Important |
| Visual Studio Code | CVE-2021-31211 | Visual Studio Code 远程代码执行漏洞 | Important |
| Visual Studio Code Remote – Containers Extension | CVE-2021-31213 | Visual Studio Code Remote Containers Extension 远程代码执行漏洞 | Important |
| Visual Studio Code | CVE-2021-31214 | Visual Studio Code 远程代码执行漏洞 | Important |
| Microsoft Office | CVE-2021-26421 | Skype for Business and Lync 欺骗漏洞 | Important |
| Microsoft Office | CVE-2021-26422 | Skype for Business and Lync 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28465 | Web Media Extensions 远程代码执行漏洞 | Important |
| Microsoft Office | CVE-2021-28474 | Microsoft SharePoint Server 远程代码执行漏洞 | Important |
| Microsoft Office | CVE-2021-28478 | Microsoft SharePoint 欺骗漏洞 | Important |
| Microsoft Office | CVE-2021-26418 | Microsoft SharePoint 欺骗漏洞 | Important |
| Open Source Software | CVE-2021-31200 | Common Utilities 远程代码执行漏洞 | Important |
| Azure | CVE-2021-31936 | Microsoft Accessibility Insights for Web 信息披露漏洞 | Important |
| Exchange Server | CVE-2021-31207 | Microsoft Exchange Server 安全功能绕过漏洞 | Moderate |
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。
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