【安全通告】Windows 网络文件系统漏洞（CVE-2020-17051、CVE-2020-17056）

2020-11-11

综述

当地时间11月10日，微软最新的月度补丁更新中修复了两枚存在于Windows 网络文件系统（Network File System，NFS）中的漏洞，分别是 CVE-2020-17051和 CVE-2020-17056。

CVE-2020-17051 是存在于nfssvr.sys驱动中的远程代码执行漏洞，据称复现时可导致蓝屏死机（BSOD）^[3]。

CVE-2020-17056是一个存在于nfssvr.sys驱动中的远程越界读取漏洞，可导致ASLR（地址空间布局随机化）被绕过。

当这两个漏洞被组合利用时，攻击者在Windows服务器上绕过漏洞缓解措施并实现远程利用的可能性将大大增加。

官方已为受影响系统提供了补丁，建议用户尽快安装更新进行防护。

NFS是个分布式的客户机/服务器文件系统。通过Windows NFS,用户可以在运行 Windows 的计算机上，像访问本地文件一样访问其他非 Windows 操作系统（如 Linux 或 UNIX）上的文件。

参考链接：

[1]https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2020-17051

[2]https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2020-17056

[3]https://www.mcafee.com/blogs/other-blogs/mcafee-labs/cve-2020-17051-remote-kernel-heap-overflow-in-nfsv3-windows-server/

受影响产品版本

CVE-2020-17051

Windows 10 Version 20H2 for 32-bit Systems
Windows 10 Version 20H2 for ARM64-based Systems
Windows 10 Version 20H2 for x64-based Systems
Windows Server, version 20H2 (Server Core Installation)
Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows 10 Version 1809 for ARM64-based Systems
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows 10 Version 1909 for 32-bit Systems
Windows 10 Version 1909 for x64-based Systems
Windows 10 Version 1909 for ARM64-based Systems
Windows Server, version 1909 (Server Core installation)
Windows 10 Version 1903 for 32-bit Systems
Windows 10 Version 1903 for x64-based Systems
Windows 10 Version 1903 for ARM64-based Systems
Windows Server, version 1903 (Server Core installation)
Windows 10 Version 2004 for 32-bit Systems
Windows 10 Version 2004 for ARM64-based Systems
Windows 10 Version 2004 for x64-based Systems
Windows Server, version 2004 (Server Core installation)
Windows 10 Version 1607 for 32-bit Systems
Windows 10 Version 1607 for x64-based Systems
Windows Server 2016
Windows Server 2016 (Server Core installation)
Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems Service Pack 1
Windows 8.1 for 32-bit systems
Windows 8.1 for x64-based systems
Windows RT 8.1
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
Windows Server 2012
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2
Windows Server 2012 R2 (Server Core installation)

CVE-2020-17056

Windows 10 Version 1803 for 32-bit Systems
Windows 10 Version 1803 for x64-based Systems
Windows 10 Version 1803 for ARM64-based Systems
Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows 10 Version 1809 for ARM64-based Systems
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows 10 Version 1909 for 32-bit Systems
Windows 10 Version 1909 for x64-based Systems
Windows 10 Version 1909 for ARM64-based Systems
Windows Server, version 1909 (Server Core installation)
Windows 10 Version 1903 for 32-bit Systems
Windows 10 Version 1903 for x64-based Systems
Windows 10 Version 1903 for ARM64-based Systems
Windows Server, version 1903 (Server Core installation)
Windows 10 Version 2004 for 32-bit Systems
Windows 10 Version 2004 for ARM64-based Systems
Windows 10 Version 2004 for x64-based Systems
Windows Server, version 2004 (Server Core installation)
Windows 10 for 32-bit Systems
Windows 10 for x64-based Systems
Windows 10 Version 1607 for 32-bit Systems
Windows 10 Version 1607 for x64-based Systems
Windows Server 2016
Windows Server 2016 (Server Core installation)
Windows 8.1 for 32-bit systems
Windows 8.1 for x64-based systems
Windows RT 8.1
Windows Server 2012
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2
Windows Server 2012 R2 (Server Core installation)
Windows 10 Version 20H2 for ARM64-based Systems
Windows Server, version 20H2 (Server Core Installation)
Windows 10 Version 20H2 for x64-based Systems
Windows 10 Version 20H2 for 32-bit Systems

解决方案

微软官方已针对受影响系统发布安全补丁，强烈建议相关用户尽快更新。补丁升级，参考链接:

https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2020-17051

https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2020-17056

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