一、漏洞概述
4月14日，微软发布4月安全更新补丁，修复了114个安全漏洞，涉及Windows、Office、Edge (Chromium-based) 、Visual Studio Code、Exchange Server、Visual Studio、Azure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19个，重要（Important）漏洞有88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。
参考链接：https://msrc.microsoft.com/update-guide/en-us/releaseNote/2021-Apr
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：
- Exchange Server代码执行漏洞（CVE-2021-28480/CVE-2021-28481/CVE-2021-28482/CVE-2021-28483）：
攻击者可利用上述漏洞绕过Exchange身份验证，无需用户交互即可实现命令执行。 CVE-2021-28480和CVE-2021-28481的CVSS评分为9.8分，是未授权远程代码执行漏洞，未经身份验证的攻击者利用漏洞，可在内网的Exchange服务器进行横向扩散，可能造成蠕虫级漏洞的危害。
官方通告链接：
https://msrc.microsoft.com/update-guide/en-US/security-guidance/advisory/CVE-2021-28480
https://msrc.microsoft.com/update-guide/en-US/security-guidance/advisory/CVE-2021-28481
https://msrc.microsoft.com/update-guide/en-US/security-guidance/advisory/CVE-2021-28482
https://msrc.microsoft.com/update-guide/en-US/security-guidance/advisory/CVE-2021-28483
- Win32k 权限提升漏洞（CVE-2021-28310）：
Win32k存在权限提升漏洞，攻击者利用此漏洞可在目标主机上以SYSTEM权限执行任意代码。目前漏洞细节已公开，且已检测到在野攻击。
官方通告链接：
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-28310
- Windows Hyper-V 安全功能绕过漏洞（CVE-2021-28444）：
攻击者可以绕过使用Router Guard配置的Hyper-V，将Windows配置为中间人路由器，从而实现截获流量并修改数据包。
官方通告链接：
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-28444
- Windows SMB信息泄露漏洞（CVE-2021-28324/CVE-2021-28325）：
Windows SMB存在两个信息泄露漏洞（CVE-2021-28324、CVE-2021-28325），攻击者可以访问内核空间中的内存内容。CVE-2021-28324无需身份验证，攻击者利用此漏洞可以未授权获取目标系统敏感信息。
官方通告链接：
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-28324
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-28325
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-2021-28480 CVE-2021-28481 CVE-2021-28482 CVE-2021-28483 | Microsoft Exchange Server 2019 Cumulative Update 8 Microsoft Exchange Server 2019 Cumulative Update 9 Microsoft Exchange Server 2016 Cumulative Update 19 Microsoft Exchange Server 2016 Cumulative Update 20 Microsoft Exchange Server 2013 Cumulative Update 23 |
| CVE-2021-28310 | 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, version 1909 (Server Core installation) 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 Windows 10 Version 1803 for x64-based Systems Windows 10 Version 1803 for 32-bit Systems |
| CVE-2021-28444 | Windows Server 2012 R2 (Server Core installation) Windows Server 2012 R2 Windows 8.1 for x64-based systems 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-2021-28324 | 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-2021-28325 | 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 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 x64-based Systems Windows 10 Version 1803 for 32-bit 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 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 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 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 |
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-Apr
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-2021-27095 | Windows Media Video Decoder 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-28315 | Windows Media Video Decoder 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-28329 | Remote Procedure Call Runtime 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-28330 | Remote Procedure Call Runtime 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-28331 | Remote Procedure Call Runtime 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-28332 | Remote Procedure Call Runtime 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-28333 | Remote Procedure Call Runtime 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-28334 | Remote Procedure Call Runtime 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-28335 | Remote Procedure Call Runtime 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-28336 | Remote Procedure Call Runtime 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-28337 | Remote Procedure Call Runtime 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-28338 | Remote Procedure Call Runtime 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-28339 | Remote Procedure Call Runtime 远程代码执行漏洞 | Critical |
| Windows | CVE-2021-28343 | Remote Procedure Call Runtime 远程代码执行漏洞 | Critical |
| Azure | CVE-2021-28460 | Azure Sphere Unsigned Code Execution Vulnerability | Critical |
| Exchange Server | CVE-2021-28480 | Microsoft Exchange Server 远程代码执行漏洞 | Critical |
| Exchange Server | CVE-2021-28481 | Microsoft Exchange Server 远程代码执行漏洞 | Critical |
| Exchange Server | CVE-2021-28482 | Microsoft Exchange Server 远程代码执行漏洞 | Critical |
| Exchange Server | CVE-2021-28483 | Microsoft Exchange Server 远程代码执行漏洞 | Critical |
| Team Foundation Server,Azure DevOps Server | CVE-2021-27067 | Azure DevOps Server and Team Foundation Server 信息披露漏洞 | Important |
| Windows | CVE-2021-27072 | Win32k 权限提升漏洞 | Important |
| Windows | CVE-2021-27079 | Windows Media Photo Codec 信息披露漏洞 | Important |
| Windows | CVE-2021-27088 | Windows Event Tracing 权限提升漏洞 | Important |
| Windows | CVE-2021-27089 | Microsoft Internet Messaging API 远程代码执行漏洞 | Important |
| Windows | CVE-2021-27090 | Windows Secure Kernel Mode 权限提升漏洞 | Important |
| Windows | CVE-2021-27091 | RPC Endpoint Mapper Service 权限提升漏洞 | Important |
| Windows | CVE-2021-27092 | Azure AD Web Sign-in 安全功能绕过漏洞 | Important |
| Windows | CVE-2021-27093 | Windows Kernel 信息披露漏洞 | Important |
| Windows | CVE-2021-27094 | Windows Early Launch Antimalware Driver 安全功能绕过漏洞 | Important |
| Windows | CVE-2021-27096 | NTFS 权限提升漏洞 | Important |
| Windows | CVE-2021-26413 | Windows Installer 欺骗漏洞 | Important |
| Windows | CVE-2021-26415 | Windows Installer 权限提升漏洞 | Important |
| Windows | CVE-2021-26416 | Windows Hyper-V 拒绝服务漏洞 | Important |
| Windows | CVE-2021-26417 | Windows Overlay Filter 信息披露漏洞 | Important |
| Windows | CVE-2021-28309 | Windows Kernel 信息披露漏洞 | Important |
| Windows | CVE-2021-28310 | Win32k 权限提升漏洞 | Important |
| Windows | CVE-2021-28311 | Windows Application Compatibility Cache 拒绝服务漏洞 | Important |
| Microsoft Visual Studio,Windows | CVE-2021-28313 | Diagnostics Hub Standard Collector Service 权限提升漏洞 | Important |
| Windows | CVE-2021-28314 | Windows Hyper-V 权限提升漏洞 | Important |
| Windows | CVE-2021-28316 | Windows WLAN AutoConfig Service 安全功能绕过漏洞 | Important |
| Windows | CVE-2021-28317 | Microsoft Windows Codecs Library 信息披露漏洞 | Important |
| Windows | CVE-2021-28318 | Windows GDI+ 信息披露漏洞 | Important |
| Windows | CVE-2021-28319 | Windows TCP/IP Driver 拒绝服务漏洞 | Important |
| Windows | CVE-2021-28320 | Windows Resource Manager PSM Service Extension 权限提升漏洞 | Important |
| Microsoft Visual Studio,Windows | CVE-2021-28321 | Diagnostics Hub Standard Collector Service 权限提升漏洞 | Important |
| Microsoft Visual Studio,Windows | CVE-2021-28322 | Diagnostics Hub Standard Collector Service 权限提升漏洞 | Important |
| Windows | CVE-2021-28323 | Windows DNS 信息披露漏洞 | Important |
| Windows | CVE-2021-28324 | Windows SMB 信息披露漏洞 | Important |
| Windows | CVE-2021-28325 | Windows SMB 信息披露漏洞 | Important |
| Windows | CVE-2021-28326 | Windows AppX Deployment Server 拒绝服务漏洞 | Important |
| Windows | CVE-2021-28327 | Remote Procedure Call Runtime 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28328 | Windows DNS 信息披露漏洞 | Important |
| Windows | CVE-2021-28340 | Remote Procedure Call Runtime 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28341 | Remote Procedure Call Runtime 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28342 | Remote Procedure Call Runtime 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28344 | Remote Procedure Call Runtime 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28345 | Remote Procedure Call Runtime 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28346 | Remote Procedure Call Runtime 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28347 | Windows Speech Runtime 权限提升漏洞 | Important |
| Windows | CVE-2021-28348 | Windows GDI+ 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28349 | Windows GDI+ 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28350 | Windows GDI+ 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28351 | Windows Speech Runtime 权限提升漏洞 | Important |
| Windows | CVE-2021-28352 | Remote Procedure Call Runtime 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28353 | Remote Procedure Call Runtime 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28354 | Remote Procedure Call Runtime 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28355 | Remote Procedure Call Runtime 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28356 | Remote Procedure Call Runtime 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28357 | Remote Procedure Call Runtime 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28358 | Remote Procedure Call Runtime 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28434 | Remote Procedure Call Runtime 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28435 | Windows Event Tracing 信息披露漏洞 | Important |
| Windows | CVE-2021-28436 | Windows Speech Runtime 权限提升漏洞 | Important |
| Windows | CVE-2021-28437 | Windows Installer 信息披露漏洞 | Important |
| Windows | CVE-2021-28438 | Windows Console Driver 拒绝服务漏洞 | Important |
| Windows | CVE-2021-28439 | Windows TCP/IP Driver 拒绝服务漏洞 | Important |
| Windows | CVE-2021-28440 | Windows Installer 权限提升漏洞 | Important |
| Windows | CVE-2021-28441 | Windows Hyper-V 信息披露漏洞 | Important |
| Windows | CVE-2021-28442 | Windows TCP/IP 信息披露漏洞 | Important |
| Windows | CVE-2021-28443 | Windows Console Driver 拒绝服务漏洞 | Important |
| Windows | CVE-2021-28444 | Windows Hyper-V 安全功能绕过漏洞 | Important |
| Windows | CVE-2021-28445 | Windows Network File System 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28446 | Windows Portmapping 信息披露漏洞 | Important |
| Windows | CVE-2021-28447 | Windows Early Launch Antimalware Driver 安全功能绕过漏洞 | Important |
| Visual Studio Code – Kubernetes Tools | CVE-2021-28448 | Visual Studio Code Kubernetes Tools 远程代码执行漏洞 | Important |
| Microsoft Office | CVE-2021-28449 | Microsoft Office 远程代码执行漏洞 | Important |
| Microsoft Office | CVE-2021-28450 | Microsoft SharePoint Denial of Service Update | Important |
| Microsoft Office | CVE-2021-28451 | Microsoft Excel 远程代码执行漏洞 | Important |
| Microsoft Office | CVE-2021-28452 | Microsoft Outlook 内存泄露漏洞 | Important |
| Microsoft Office | CVE-2021-28453 | Microsoft Word 远程代码执行漏洞 | Important |
| Microsoft Office | CVE-2021-28454 | Microsoft Excel 远程代码执行漏洞 | Important |
| Microsoft Office | CVE-2021-28456 | Microsoft Excel 信息披露漏洞 | Important |
| Visual Studio Code | CVE-2021-28457 | Visual Studio Code 远程代码执行漏洞 | Important |
| Azure | CVE-2021-28458 | Azure ms-rest-nodeauth Library 权限提升漏洞 | Important |
| Azure DevOps Server | CVE-2021-28459 | Azure DevOps Server 欺骗漏洞 | Important |
| Visual Studio Code | CVE-2021-28469 | Visual Studio Code 远程代码执行漏洞 | Important |
| Visual Studio Code – GitHub Pull Requests and Issues Extension | CVE-2021-28470 | Visual Studio Code GitHub Pull Requests and Issues Extension 远程代码执行漏洞 | Important |
| Visual Studio Code | CVE-2021-28471 | Remote Development Extension for Visual Studio Code 远程代码执行漏洞 | Important |
| Visual Studio Code – Maven for Java Extension | CVE-2021-28472 | Visual Studio Code Maven for Java Extension 远程代码执行漏洞 | Important |
| Visual Studio Code | CVE-2021-28475 | Visual Studio Code 远程代码执行漏洞 | Important |
| Visual Studio Code | CVE-2021-28477 | Visual Studio Code 远程代码执行漏洞 | Important |
| Microsoft Visual Studio | CVE-2021-27064 | Visual Studio Installer 权限提升漏洞 | Important |
| Windows | CVE-2021-27086 | Windows Services and Controller App 权限提升漏洞 | Important |
| Windows | CVE-2021-28464 | VP9 Video Extensions 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28466 | Raw Image Extension 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28468 | Raw Image Extension 远程代码执行漏洞 | Important |
| Visual Studio Code | CVE-2021-28473 | Visual Studio Code 远程代码执行漏洞 | Important |
| Windows | CVE-2021-28312 | Windows NTFS 拒绝服务漏洞 | Moderate |
| Microsoft Edge (Chromium-based) | CVE-2021-21194 | Chromium: CVE-2021-21194 Use after free in screen capture | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-21195 | Chromium: CVE-2021-21195 Use after free in V8 | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-21196 | Chromium: CVE-2021-21196 Heap buffer overflow in TabStrip | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-21197 | Chromium: CVE-2021-21197 Heap buffer overflow in TabStrip | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-21198 | Chromium: CVE-2021-21198 Out of bounds read in IPC | Unknown |
| Microsoft Edge (Chromium-based) | CVE-2021-21199 | Chromium: CVE-2021-21199 Use Use after free in Aura | Unknown |
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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