Microsoft Updates And Notifications For November 2021

ronjor · Nov 1, 2021

September 2021 updates for Microsoft Office
Office Standard 2016 Office Professional Plus 2016 More...

Introduction
Microsoft released the following security and nonsecurity updates for Office in September 2021. These updates are intended to help our customers keep their computers up-to-date. We recommend that you install all updates that apply to you.
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ronjor · Nov 9, 2021

November 2021 Security Updates
https://msrc.microsoft.com/update-guide/releaseNote/2021-Nov

Security Update Guide - Microsoft

guest · Nov 9, 2021

Microsoft November 2021 Patch Tuesday fixes 6 zero-days, 55 flaws
November 9, 2021
https://www.bleepingcomputer.com/ne...021-patch-tuesday-fixes-6-zero-days-55-flaws/

Today is Microsoft's November 2021 Patch Tuesday, and with it comes fixes for six zero-day vulnerabilities and a total of 55 flaws. The actively exploited vulnerabilities are for Microsoft Exchange and Excel, with the Exchange zero-day used as part of the Tianfu hacking contest.

Microsoft has fixed 55 vulnerabilities with today's update, with six classified as Critical and 49 as Important.
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For information about the non-security Windows updates, you can read about today's Windows 10 KB5007186 & KB5007189 cumulative updates and the Windows 11 KB5007215 cumulative update.
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Microsoft Windows Security Updates November 2021 overview
https://www.ghacks.net/2021/11/09/microsoft-windows-security-updates-november-2021-overview/

This guide offers an overview of the security updates and non-security updates that Microsoft released for its products on the November 2021 Patch Day. Microsoft released updates for all supported client and server versions of Windows, including Windows 11, and for other company products such as Microsoft Office.

The overview begins with an executive summary that summarizes the most important information. Then you find the operating system distribution, information about all updates for client versions of Windows, including known issues confirmed by Microsoft, lists of other security and non security updates, and download information.
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guest · Nov 9, 2021

Microsoft patches actively exploited Exchange, Excel zero-days (CVE-2021-42321, CVE-2021-42292)
November 9, 2021
https://www.helpnetsecurity.com/2021/11/09/cve-2021-42321-cve-2021-42292/

It’s a light November 2021 Patch Tuesday from Microsoft: 55 fixed CVEs, of which two are zero-days under active exploitation: CVE-2021-42321, a Microsoft Exchange RCE, and CVE-2021-42292, a Microsoft Excel security feature bypass bug.

CVE-2021-42321, the remote code execution vulnerability in Microsoft Exchange Server 2016 and 2019, is due to issues with the validation of command-let (cmdlet) arguments.

“In order to exploit this flaw, an attacker would need to be authenticated, which limits some of the impact. Microsoft says they are aware of ‘limited targeted attacks’ using this vulnerability in the wild,” says Satnam Narang, staff research engineer at Tenable.
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In a blog post published by the Exchange Team, the company recommended that the provided updates for Microsoft Exchange be installed immediately. They delineated two possible update paths, and shared a PowerShell query that security teams can use to check to see if an exploit was attempted on their servers.

The in-the-wild exploitation of CVE-2021-42292, the Microsoft Excel security feature bypass zero-day, was apparently discovered by Microsoft’s Security Threat Intelligence Center (MSTIC).

“This patch fixes a bug that could allow code execution when opening a specially crafted file with an affected version of Excel. This is likely due to loading code that should be behind a prompt, but for whatever reason, that prompt does not appear, thus bypassing that security feature,” noted Dustin Childs, with Trend Micro’s Zero Day Initiative.
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anon · Nov 22, 2021

November 22, 2021—KB5007253 (OS Builds 19041.1382, 19042.1382, 19043.1382, and 19044.1382) Preview
Windows 10, version 2004, all editions, Windows Server version 2004 Windows 10, version 20H2, all editions, Windows Server, version 20H2, all editions, Windows 10, version 21H1, all editions, Windows 10, version 21H2, all editions.
https://support.microsoft.com/en-us...-preview-d1847be9-46c1-49fc-bf56-1d469fc1b3af
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November 22, 2021—KB5007262 (OS Build 22000.348 ) Preview
Windows 11
https://support.microsoft.com/en-us...-preview-7f3e18d7-4189-4882-b0e9-afc920253aee
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Windows 11 KB5007262 Cumulative Update Preview Released
https://www.bleepingcomputer.com/ne...kb5007262-cumulative-update-preview-released/

Microsoft has released the optional KB5007262 Preview cumulative update for Windows 11 with 70 fixes or improvements.
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