CVE-2020-17051: Windows Network File System Remote Code Execution Vulnerability

Overview

Severity

Critical (CVSS 9.8)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

More Likely

Patch Tuesday

2020-Nov

Released

2020-11-10

Last Updated

2020-11-16

EPSS Score

16.77% (percentile: 94.9%)

FAQ

What is the attack vector for this vulnerability? In a network-based attack an attacker with write access to an NFS share could execute code remotely within the kernel. Is this CVE wormable? This CVE is wormable between machines hosting writable NFS shares. Where should the customer be applying the update? The vulnerability only exists in Windows NFS Servers.

Affected Products (18)

Windows

• Windows Server, version 20H2 (Server Core Installation)
• Windows Server 2019
• Windows Server 2019 (Server Core installation)
• Windows Server, version 1909 (Server Core installation)
• Windows Server, version 1903 (Server Core installation)
• Windows Server, version 2004 (Server Core installation)
• Windows Server 2016
• Windows Server 2016 (Server Core installation)

ESU

• 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)

Security Updates (12)

• 4586781
• 4586793
• 4586786
• 4586830
• 4586807
• 4586817
• 4586827
• 4586805
• 4586834
• 4586808
• 4586845
• 4586823

Acknowledgments

Soyeon Park - Microsoft Platform Security Assurance & Vulnerability Research

Revision History

• 2020-11-10: Information published.
• 2020-11-16: Revised CVE to remove client software from the Security Updates table as this vulnerability only affects servers. Added FAQ section. These are informational changes only.