【安全通告】微软5月安全更新多个产品高危漏洞通告

2021-05-12

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