一、漏洞概述

6月9日，微软发布6月安全更新补丁，修复了50个安全漏洞，其中包括一个Windows Print Spooler权限提升漏洞（CVE-2021-1675）。

Print Spooler是Windows系统中用于管理打印相关事务的服务，虽然微软在公告中将该漏洞标记为Important级别的本地权限提升漏洞，但实际上在域环境中合适的条件下，无需任何用户交互，未经身份验证的远程攻击者就可以利用该漏洞以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。

我们认为该漏洞实际威胁等级较高，建议相关用户尽快采取措施进行防护，尤其是域控制器等服务器。

参考链接：https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-1675

二、影响范围

受影响版本

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

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

三、漏洞防护

3.1 官方升级

目前微软官方已针对支持的系统版本发布了修复该漏洞的安全补丁，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/vulnerability/CVE-2021-1675

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。

3.2 临时防护措施

若相关用户暂时无法进行补丁更新，可通过禁用Print Spooler服务来进行缓解：

一：在服务应用（services.msc）中找到Print Spooler服务。

二：停止运行服务，同时将“启动类型”修改为“禁用”。

来源：绿盟科技http://blog.nsfocus.net/windows-print-spoolercve/