2021年7月1日，微软发布了Windows Print Spooler远程代码执行漏洞（CVE-2021-34527）。日前，该漏洞的exp已在网络上公开。微软官方暂无相关补丁。该exp可以绕过微软6月针对CVE-2021-1675的补丁。建议相关用户尽早做好缓解措施，暂时关闭相关的Print Spooler服务。

 Windows Print Spooler是Windows的打印机后台处理程序，广泛的应用于各种内网中，攻击者可以利用该0day漏洞使用一个低权限用户（包括匿名共享guest账户），对本地网络中的电脑发起攻击，控制存在漏洞的电脑。尤其在企业内部，在域环境中，普通域用户，可以通过该服务，攻击域控服务器，从而控制整个网络。

此次泄漏的exp利用难度低，同时该漏洞广泛存在于各个Windows版本中。且成功利用该漏洞的攻击者可以完整的控制域环境，攻击可能造成的后果严重，所以该漏洞的利用价值极高。

毒霸安全专家建议相关用户尽快升级系统以修复该漏洞，避免受到黑客攻击。

- 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 Coreinstallation)

- Windows Server 2008 R2 for x64-based Systems Service Pack 1

- Windows Server 2008 for x64-based Systems Service Pack 2 (Server Coreinstallation)

- Windows Server 2008 for x64-based Systems Service Pack 2

- Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Coreinstallation)

- 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 Coreinstallation)

- 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 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 Coreinstallation)

- 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

目前正式补丁尚未发布，相关用户可以通过禁用Print Spooler服务来缓解漏洞风险。

临时解决方案：

运行service.msc，在服务列表中找到PrintSpooler服务。 

右键打开服务属性，将服务类型修改为“禁用”，并停止该服务。

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34527