CVE-2021-1675
Windows Print Spooler
远程命令执行漏洞
Print Spooler 是 Windows 打印后台处理服务，即管理所有本地和网络打印队列及控制所有打印工作。
6月21日，微软官方发布安全补丁更新，其中修复了一处存在于 Windows Print Spooler 的远程命令执行漏洞，CVE编号为CVE-2021-1675。
6月29日, GitHub 上公开了 Windows Print Spooler 远程代码执行漏洞的 POC。
漏洞描述
由于 SeLoadDriverPrivilege 中鉴权存在代码缺陷，参数可以被攻击者控制，普通用户可以通过 RPC 触发 RpcAddPrinterDrive 绕过安全检查并写入恶意驱动程序。如果一个域中存在此漏洞，域中普通用户即可通过连接域控 Spooler 服务，向域控中添加恶意驱动，从而控制整个域环境。
影响范围
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Windows 10 Version 1809 for 32-bit Systems
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Windows Server 2012 R2 (Server Core installation)
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Windows Server 2012 R2
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Windows Server 2012 (Server Core installation)
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Windows Server 2012
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Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
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Windows Server 2008 R2 for x64-based Systems Service Pack 1
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Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
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Windows Server 2008 for x64-based Systems Service Pack 2
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Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
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Windows Server 2008 for 32-bit Systems Service Pack 2
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Windows RT 8.1
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Windows 8.1 for x64-based systems
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Windows 8.1 for 32-bit systems
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Windows 7 for x64-based Systems Service Pack 1
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Windows 7 for 32-bit Systems Service Pack 1
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Windows Server 2016 (Server Core installation)
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Windows Server 2016
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Windows 10 Version 1607 for x64-based Systems
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Windows 10 Version 1607 for 32-bit Systems
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Windows 10 for x64-based Systems
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Windows 10 for 32-bit Systems
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Windows Server, version 20H2 (Server Core Installation)
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Windows 10 Version 20H2 for ARM64-based Systems
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Windows 10 Version 20H2 for 32-bit Systems
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Windows 10 Version 20H2 for x64-based Systems
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Windows Server, version 2004 (Server Core installation)
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Windows 10 Version 2004 for x64-based Systems
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Windows 10 Version 2004 for ARM64-based Systems
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Windows 10 Version 2004 for 32-bit Systems
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Windows 10 Version 21H1 for 32-bit Systems
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Windows 10 Version 21H1 for ARM64-based Systems
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Windows 10 Version 21H1 for x64-based Systems
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Windows 10 Version 1909 for ARM64-based Systems
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Windows 10 Version 1909 for x64-based Systems
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Windows 10 Version 1909 for 32-bit Systems
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Windows Server 2019 (Server Core installation)
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Windows Server 2019
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Windows 10 Version 1809 for ARM64-based Systems
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Windows 10 Version 1809 for x64-based Systems
解决方案
更新官方补丁
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
关闭Print Spooler服务
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：
1、在服务应用（services.msc）中找到 Print Spooler 服务。
2、停止运行服务，同时将“启动类型”修改为“禁用”。
参考资料
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https://github.com/afwu/PrintNightmare
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https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-1675
本文始发于微信公众号（长亭安全课堂）：漏洞风险提示 | CVE-2021-1675 - Windows Print Spooler 远程命令执行漏洞
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