Patch Tuesday - January 2021

We arrive at the first Patch Tuesday of 2021 (2021-Jan) with 83 vulnerabilities across our standard spread of products.  Windows Operating System vulnerabilities dominated this month's advisories, followed by Microsoft Office (which includes the SharePoint family of products), and lastly some from less frequent products such as Microsoft System Center and Microsoft SQL Server.

Vulnerability Breakdown by Software Family

Microsoft Defender Remote Code Execution Vulnerability (CVE-2021-1647)

CVE-2021-1647 is marked as a CVSS 7.8, actively exploited, remote code execution vulnerability through the Microsoft Malware Protection Engine (mpengine.dll) between version 1.1.17600.5 up to 1.1.17700.4.

As a default, Microsoft's affected antimalware software will automatically keep the Microsoft Malware Protection Engine up to date. What this means, however, is that no further action is needed to resolve this vulnerability unless non-standard configurations are used.  

This vulnerability affects Windows Defender or the supported Endpoint Protection pieces of the System Center family of products (2012, 2012 R2, and namesake version: Microsoft System Center Endpoint Protection).

Patching Windows Operating Systems Next

Another confirmation of the standard advice of prioritizing Operating System patches whenever possible is that 11 of the 13 top CVSS-scoring (CVSSv3 8.8) vulnerabilities addressed in this month's Patch Tuesday would be immediately covered through these means. As an interesting observation, the Windows Remote Procedure Call Runtime component appears to have been given extra scrutiny this month.  This RPC Runtime component accounts for the 9 of the 13 top CVSS scoring vulnerabilities along with half of all the 10 Critical Remote Code Execution vulnerabilities being addressed.

More Work to be Done

Lastly, some minor calls to note that this Patch Tuesday includes SQL Server as that is an atypical family covered during Patch Tuesdays and, arguably more notable, is a reminder that Adobe Flash has officially reached end-of-life and would've been actively removed from all browsers via Windows Update (already).

Summary Tables

Here are this month's patched vulnerabilities split by the product family.

Azure Vulnerabilities

Browser Vulnerabilities

Developer Tools Vulnerabilities

Developer Tools Windows Vulnerabilities

Microsoft Office Vulnerabilities

SQL Server Vulnerabilities

System Center Vulnerabilities

Windows Vulnerabilities

Windows Apps Vulnerabilities

Windows ESU Vulnerabilities

Summary Graphs

Note: Graph data is reflective of data presented by Microsoft's CVRF at the time of writing.