一、漏洞概述
8月11日，绿盟科技CERT监测到微软发布8月安全更新补丁，修复了46个安全问题，涉及Windows、Microsoft Office、ASP.NET Core、Microsoft Visual Studio、Azure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39个。其中有3个为0day漏洞，有2个漏洞信息已在上月发布：
Windows权限提升漏洞（CVE-2021-36934）
Windows Print Spooler 远程代码执行漏洞（CVE-2021-34481）
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多数漏洞的检测能力（包括CVE-2021-36936、CVE-2021-26424、CVE-2021-36947、CVE-2021-34534、CVE-2021-26432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V6.0R02F01.2405，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-Aug
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 Print Spooler远程代码执行漏洞（CVE-2021-36936）：
Print Spooler是Windows系统中管理打印相关事务的服务，域用户可远程利用该漏洞以SYSTEM权限在域控制器上执行任意代码，从而获得整个域的控制权，该漏洞细节已公开。
官方通告链接：https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-36936
Windows Print Spooler 远程代码执行漏洞（CVE-2021-36947）
Windows打印后台处理程序中存在远程代码执行漏洞，拥有低权限的攻击者可以在不需要用户交互的情况下，在目标主机远程执行代码。
官方通告链接：https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-36947
Windows TCP/IP 远程执行代码漏洞（CVE-2021-26424）
Windows TCP/IP 存在远程代码执行漏洞，该漏洞源于 tcpip.sys 在处理通过 IPv6 协议发送的 TCP/IP 数据包时存在边界错误。远程 Hyper-V 来宾可以向受影响的 Hyper-V 主机发送特制的 IPv6 ping，触发内存损坏从而在目标主机上执行任意代码。
官方通告链接：https://msrc.microsoft.com/update-guide/en-US/vulnerability/ CVE-2021-26424
Windows LSA 欺骗漏洞（CVE-2021-36942）：
Windows LSA存在欺骗漏洞，未经身份验证的攻击者可利用此漏洞从域控或者其他主机窃取NTLM哈希，且无需用户交互，目前该漏洞细节已公开。
官方通告链接：https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-36942
Windows Update Medic Service权限提升漏洞（CVE-2021-36948）
由于 Windows Update Medic 服务存在边界错误，攻击者可利用此漏洞获得高等级用户权限，从而接管设备控制权限。目前此漏洞已发现在野利用。
官方通告链接：https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-36948
Windows Services for NFS ONCRPC XDR Driver远程代码执行漏洞（CVE-2021-26432 ）
NFS Windows Services的RPC调用（RPCXDR）内核驱动中存在漏洞，未经身份验证的远程攻击者可以利用该漏洞在目标主机上执行代码，且无需用户交互。
官方通告链接：https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-26432
Remote Desktop Client 远程代码执行漏洞（CVE-2021-34535 ）
Windows远程桌面客户端存在远程代码执行漏洞，未经身份验证的攻击者利用此漏洞可使用与受害者相同的方式进行身份验证，从而获得系统权限，该漏洞需要和用户交互。
官方通告链接：https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-34535
Scripting Engine内存损坏漏洞(CVE-2021-34480)
Windows脚本引擎存在内存损坏漏洞，远程攻击者通过欺骗受害者访问恶意网站或打开特制文件，触发内存损坏从而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-2021-34480
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-2021-36936 CVE-2021-36947 CVE-2021-26424 | Windows Server, version 20H2 (Server Core Installation) Windows Server, version 2004 (Server Core installation) Windows Server 2019 (Server Core installation) Windows Server 2019 Windows Server 2016 (Server Core installation) Windows Server 2016 Windows Server 2012 R2 (Server Core installation) Windows Server 2012 R2 Windows Server 2012 (Server Core installation) Windows Server 2012 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 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 10 for x64-based Systems Windows 10 for 32-bit Systems Windows 10 Version 21H1 for x64-based Systems Windows 10 Version 21H1 for ARM64-based Systems Windows 10 Version 21H1 for 32-bit Systems Windows 10 Version 20H2 for x64-based Systems Windows 10 Version 20H2 for ARM64-based Systems Windows 10 Version 20H2 for 32-bit Systems 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 1909 for x64-based Systems Windows 10 Version 1909 for ARM64-based Systems Windows 10 Version 1909 for 32-bit Systems Windows 10 Version 1809 for x64-based Systems Windows 10 Version 1809 for ARM64-based Systems Windows 10 Version 1809 for 32-bit Systems Windows 10 Version 1607 for x64-based Systems Windows 10 Version 1607 for 32-bit Systems |
| CVE-2021-36942 | Windows Server, version 20H2 (Server Core Installation) Windows Server, version 2004 (Server Core installation) Windows Server 2019 (Server Core installation) Windows Server 2019 Windows Server 2016 (Server Core installation) Windows Server 2016 Windows Server 2012 R2 (Server Core installation) Windows Server 2012 R2 Windows Server 2012 (Server Core installation) Windows Server 2012 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 Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) Windows Server 2008 R2 for x64-based Systems Service Pack 1 |
| CVE-2021-36948 | Windows Server, version 20H2 (Server Core Installation) Windows Server, version 2004 (Server Core installation) Windows Server 2019 (Server Core installation) Windows Server 2019 Windows 10 Version 21H1 for x64-based Systems Windows 10 Version 21H1 for ARM64-based Systems Windows 10 Version 21H1 for 32-bit Systems Windows 10 Version 20H2 for x64-based Systems Windows 10 Version 20H2 for ARM64-based Systems Windows 10 Version 20H2 for 32-bit Systems 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 1909 for x64-based Systems Windows 10 Version 1909 for ARM64-based Systems Windows 10 Version 1909 for 32-bit Systems Windows 10 Version 1809 for x64-based Systems Windows 10 Version 1809 for ARM64-based Systems Windows 10 Version 1809 for 32-bit Systems |
| CVE-2021-26432 | Windows Server, version 20H2 (Server Core Installation) Windows Server, version 2004 (Server Core installation) Windows Server 2019 (Server Core installation) Windows Server 2019 Windows Server 2016 (Server Core installation) Windows Server 2016 Windows Server 2012 R2 (Server Core installation) Windows Server 2012 R2 Windows Server 2012 (Server Core installation) Windows Server 2012 Windows RT 8.1 Windows 8.1 for x64-based systems Windows 8.1 for 32-bit systems Windows 10 for x64-based Systems Windows 10 for 32-bit Systems Windows 10 Version 21H1 for x64-based Systems Windows 10 Version 21H1 for ARM64-based Systems Windows 10 Version 21H1 for 32-bit Systems Windows 10 Version 20H2 for x64-based Systems Windows 10 Version 20H2 for ARM64-based Systems Windows 10 Version 20H2 for 32-bit Systems 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 1909 for x64-based Systems Windows 10 Version 1909 for ARM64-based Systems Windows 10 Version 1909 for 32-bit Systems Windows 10 Version 1809 for x64-based Systems Windows 10 Version 1809 for ARM64-based Systems Windows 10 Version 1809 for 32-bit Systems Windows 10 Version 1607 for x64-based Systems Windows 10 Version 1607 for 32-bit Systems |
| CVE-2021-34535 | Windows Server 2019 Windows Server 2016 Windows Server 2012 R2 Windows Server 2012 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 10 for x64-based Systems Windows 10 for 32-bit Systems Windows 10 Version 21H1 for x64-based Systems Windows 10 Version 21H1 for ARM64-based Systems Windows 10 Version 21H1 for 32-bit Systems Windows 10 Version 20H2 for x64-based Systems Windows 10 Version 20H2 for ARM64-based Systems Windows 10 Version 20H2 for 32-bit Systems 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 1909 for x64-based Systems Windows 10 Version 1909 for ARM64-based Systems Windows 10 Version 1909 for 32-bit Systems Windows 10 Version 1809 for x64-based Systems Windows 10 Version 1809 for ARM64-based Systems Windows 10 Version 1809 for 32-bit Systems Windows 10 Version 1607 for x64-based Systems Windows 10 Version 1607 for 32-bit Systems Remote Desktop client for Windows Desktop |
| CVE-2021-34480 | Windows Server 2019 Windows Server 2016 Windows Server 2012 R2 Windows Server 2012 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 10 for x64-based Systems Windows 10 for 32-bit Systems Windows 10 Version 21H1 for x64-based Systems Windows 10 Version 21H1 for ARM64-based Systems Windows 10 Version 21H1 for 32-bit Systems Windows 10 Version 20H2 for x64-based Systems Windows 10 Version 20H2 for ARM64-based Systems Windows 10 Version 20H2 for 32-bit Systems 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 1909 for x64-based Systems Windows 10 Version 1909 for ARM64-based Systems Windows 10 Version 1909 for 32-bit Systems Windows 10 Version 1809 for x64-based Systems Windows 10 Version 1809 for ARM64-based Systems Windows 10 Version 1809 for 32-bit Systems Windows 10 Version 1607 for x64-based Systems Windows 10 Version 1607 for 32-bit Systems |
四、漏洞防护
- 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-Aug
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 |
| Windows | CVE-2021-34480 | Scripting Engine 内存泄露漏洞 | Critical |
| Windows | CVE-2021-34534 | Windows MSHTML Platform 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-26424 | Windows TCP/IP 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-36936 | Windows Print Spooler 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-34530 | Windows Graphics Component 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-34535 | Remote Desktop Client 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-26432 | Windows Services for NFS ONCRPC XDR Driver 远程代码执行漏洞 | Critical |
| Azure | CVE-2021-33762 | Azure CycleCloud 权限提升漏洞 | Important |
| Microsoft Dynamics | CVE-2021-34524 | Microsoft Dynamics 365 (on-premises) 远程代码执行漏洞 | Important |
| Microsoft Office | CVE-2021-34478 | Microsoft Office 远程代码执行漏洞 | Important |
| Windows | CVE-2021-34486 | Windows Event Tracing 权限提升漏洞 | Important |
| Windows | CVE-2021-34536 | Storage Spaces Controller 权限提升漏洞 | Important |
| Windows | CVE-2021-34487 | Windows Event Tracing 权限提升漏洞 | Important |
| Windows | CVE-2021-34537 | Windows Bluetooth Driver 权限提升漏洞 | Important |
| Visual Studio,.NET,.NET Core,Microsoft Visual Studio | CVE-2021-26423 | .NET Core and Visual Studio 拒绝服务漏洞 | Important |
| Windows | CVE-2021-26425 | Windows Event Tracing 权限提升漏洞 | Important |
| Windows | CVE-2021-26426 | Windows User Account Profile Picture 权限提升漏洞 | Important |
| Azure | CVE-2021-26428 | Azure Sphere 信息披露漏洞 | Important |
| Azure | CVE-2021-26429 | Azure Sphere 权限提升漏洞 | Important |
| Azure | CVE-2021-26430 | Azure Sphere 拒绝服务漏洞 | Important |
| Windows | CVE-2021-36937 | Windows Media MPEG-4 Video Decoder 远程代码执行漏洞 | Important |
| Windows | CVE-2021-36938 | Windows Cryptographic Primitives Library 信息披露漏洞 | Important |
| Windows | CVE-2021-36942 | Windows LSA 欺骗漏洞 | Important |
| Microsoft Office | CVE-2021-36940 | Microsoft SharePoint Server 欺骗漏洞 | Important |
| Microsoft Office | CVE-2021-36941 | Microsoft Word 远程代码执行漏洞 | Important |
| Windows | CVE-2021-36945 | Windows 10 Update Assistant 权限提升漏洞 | Important |
| Microsoft Dynamics | CVE-2021-36946 | Microsoft Dynamics Business Central 跨站脚本漏洞 | Important |
| Windows | CVE-2021-36947 | Windows Print Spooler 远程代码执行漏洞 | Important |
| Windows | CVE-2021-36948 | Windows Update Medic Service 权限提升漏洞 | Important |
| Azure | CVE-2021-36949 | Microsoft Azure Active Directory Connect Authentication Bypass Vulnerability | Important |
| Microsoft Dynamics | CVE-2021-36950 | Microsoft Dynamics 365 (on-premises) 跨站脚本漏洞 | Important |
| System Center | CVE-2021-34471 | Microsoft Windows Defender 权限提升漏洞 | Important |
| ASP.NET Core,Visual Studio,Microsoft Visual Studio | CVE-2021-34532 | ASP.NET Core and Visual Studio 信息披露漏洞 | Important |
| Windows | CVE-2021-34533 | Windows Graphics Component Font Parsing 远程代码执行漏洞 | Important |
| Windows | CVE-2021-34483 | Windows Print Spooler 权限提升漏洞 | Important |
| Windows | CVE-2021-34484 | Windows User Profile Service 权限提升漏洞 | Important |
| .NET,.NET Core,Microsoft Visual Studio | CVE-2021-34485 | .NET Core and Visual Studio 信息披露漏洞 | Important |
| Windows | CVE-2021-26431 | Windows Recovery Environment Agent 权限提升漏洞 | Important |
| Windows | CVE-2021-26433 | Windows Services for NFS ONCRPC XDR Driver 信息披露漏洞 | Important |
| Windows | CVE-2021-36926 | Windows Services for NFS ONCRPC XDR Driver 信息披露漏洞 | Important |
| Windows | CVE-2021-36927 | Windows Digital TV Tuner device registration application 权限提升漏洞 | Important |
| Windows | CVE-2021-36932 | Windows Services for NFS ONCRPC XDR Driver 信息披露漏洞 | Important |
| Windows | CVE-2021-36933 | Windows Services for NFS ONCRPC XDR Driver 信息披露漏洞 | Important |
| Azure | CVE-2021-36943 | Azure CycleCloud 权限提升漏洞 | 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。