Microsoft security advisory – February 2021 monthly rollup

Number: AV21-073
Date: 10 February 2021

On 9 February 2021 Microsoft published Security Updates to address vulnerabilities in multiple products. Included were critical updates for the following:

• .NET (Core/Framework)
• Windows 10, 8.1 and 7
• Windows RT
• Windows Server

Included in this update is the default enablement of Domain Controller enforcement mode, which blocks insecure NRPC connections from non-compliant devices.  This update also addresses a vulnerability VulnerabilityA flaw or weakness in the design or implementation of an information system or its environment that could be exploited to adversely affect an organization's assets or operations. in Windows Win32k which may result in an escalation of privilege resulting in full system compromise CompromiseThe intentional or unintentional disclosure of information, which adversely impacts its confidentiality, integrity, or availability. . Microsoft has confirmed this vulnerability has been detected in the wild.

The Cyber Centre encourages users and administrators to review the provided web links and apply the necessary updates.
February 2021 Release Notes
https://msrc.microsoft.com/update-guide/releaseNote/2021-Feb

Netlogon Domain Controller Enforcement Mode - related to CVE-2020-1472
https://msrc-blog.microsoft.com/2021/01/14/netlogon-domain-controller-enforcement-mode-is-enabled-by-default-beginning-with-the-february-9-2021-security-update-related-to-cve-2020-1472/

Windows Win32k Elevation of Privilege Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1732

Security Update Guide
https://portal.msrc.microsoft.com/en-us/security-guidance

Note to Readers 
The Canadian Centre for Cyber Security Cyber securityThe protection of digital information, as well as the integrity of the infrastructure housing and transmitting digital information. More specifically, cyber security includes the body of technologies, processes, practices and response and mitigation measures designed to protect networks, computers, programs and data from attack, damage or unauthorized access so as to ensure confidentiality, integrity and availability. (Cyber Centre) operates as part of the Communications Security Establishment.  We are Canada’s national authority on cyber security and we lead the government’s response to cyber security events. As Canada's national computer security incident response team, the Cyber Centre works in close collaboration with government departments, critical infrastructure Critical infrastructureProcesses, systems, facilities, technologies, networks, assets, and services essential to the health, safety, security, or economic well-being of Canadians and the effective functioning of government. Critical infrastructure can be stand-alone or interconnected and interdependent within and across provinces, territories, and national borders. Disruptions of critical infrastructure could result in catastrophic loss of life, adverse economic effects, and significant harm to public confidence. , Canadian businesses and international partners to prepare for, respond to, mitigate, and recover from cyber events. We do this by providing authoritative advice and support, and coordinating information sharing and incident response. The Cyber Centre is outward-facing, welcoming partnerships that help build a stronger, more resilient cyber space in Canada.