Microsoft to Launch ‘Enforcement Mode’ for Zerologon Flaw
Enforcement mode for the Netlogon Domain Controller will be enabled by default with the Feb. 9 security update.
Microsoft has warned IT security admins that starting with its Feb. 9, 2021, security update, it will enable Domain Controller (DC) enforcement mode by default as a means of addressing a Critical remote code execution vulnerability affecting the Netlogon protocol.
This move will block vulnerable connections from noncompliant devices, according to a Microsoft Security and Response Center blog post. DC enforcement mode requires both Windows and non-Windows devices to use secure Remote Procedure Call (RPC) with a Netlogon secure channel, unless a business has allowed an account to be exposed by adding an exception for a noncompliant device.
CVE-2020-1472 is a privilege escalation flaw in the Windows Netlogon Remote Protocol (MS-NRPC) with a CVSS score of 10. It could enable an unauthenticated attacker to use MS-NRPC to connect to a domain controller and gain full admin access.