February 2021 – Microsoft Patch Tuesday and Other Patches

Microsoft has released fixes for 56 vulnerabilities, with 11 updates classified as Critical and 43 as Important. Here’s an updated announcement (2021-02-09) from Microsoft: Deploy Windows SSUs and LCUs together with one cumulative update –

Beginning with the February 2021 LCU, we will now publish all future cumulative updates and SSUs for Windows 10, version 2004 and above together as one cumulative monthly update to the normal release category in WSUS.

LCU = Latest Cummulative Update
SSU – Servicing Stack Update

UPDATE – 2021-02-21
KB4301818 > KB5001078

UPDATE – 2021-02-17
KB4577586

Windows 10 Updates for February 2021:

  • KB4601319 (OS Builds 19041.804 and 19042.804) for Windows 10 version 20H2 / 2004
  • KB4601315 (OS Build 18363.1377) for Windows 10, version 1909
  • KB5001028 (OS Build 18363.1379) Out-of-band for Windows 10, version 1909
  • KB4601345 (OS Build 17763.1757) for Windows 10 version 1809
  • KB4601354 (OS Build 17134.2026) for Windows 10 version 1803
  • KB4601330 (OS Build 15063.2642) for Windows 10 version 1703
  • KB4601318 (OS Build 14393.4225) for Windows 10 version 1607
  • KB4601331 (OS Build 10240.18842) for Windows 10, initial release

Additional February 2021 Patching Resources:

Patched publicly disclosed vulnerabilities:

  • CVE-2021-1721 – .NET Core and Visual Studio Denial of Service Vulnerability
  • CVE-2021-1727 – Windows Installer Elevation of Privilege Vulnerability
  • CVE-2021-1733 – Sysinternals PsExec Elevation of Privilege Vulnerability
  • CVE-2021-24098 – Windows Console Driver Denial of Service Vulnerability
  • CVE-2021-24106 – Windows DirectX Information Disclosure Vulnerability
  • CVE-2021-26701 – .NET Core Remote Code Execution Vulnerability

Intel microcode updates for Windows:

Microsoft has also released Intel microcode updates for Windows 10 20H2, 2004, 1909, and older versions to fix issues impacting current and previously released Windows 10 versions.

These microcode updates are offered to affected devices via Windows Update but they can also be manually downloaded directly from the Microsoft Catalog using these links:

  • KB4589212: Intel microcode updates for Windows 10, version 2004 and 20H2, and Windows Server, version 2004 and 20H2
  • KB4589211: Intel microcode updates for Windows 10, version 1903 and 1909, and Windows Server, version 1903 and 1909
  • KB4589208: Intel microcode updates for Windows 10, version 1809 and Windows Server 2019
  • KB4589206: Intel microcode updates for Windows 10, version 1803
  • KB4589210: Intel microcode updates for Windows 10, version 1607 and Windows Server 2016
  • KB4589198: Intel microcode updates for Windows 10, version 1507

On February 9, 2021, Microsoft released security updates affecting the following Microsoft products:

Product FamilyMaximum SeverityMaximum ImpactAssociated KB Articles and/or Support Webpages
Windows 10 v20H2, v2004, v1909, v1809, and v1803CriticalRemote Code ExecutionWindows 10 v2004 and Windows 10 v20H2: 4601319 Windows 10 v1909: 4601315 Windows 10 v1809: 4601345 Windows 10 v1803: 4601354
Windows Server 2019, Windows Server 2016, and Server Core installations (2019, 2016, v20H2, v2004, and v1909)CriticalRemote Code ExecutionWindows Server 2019: 4601345 Windows Server 2016: 4601318 Windows Server v2004 and Windows Server v20H2: 4601319 Windows Server v1909: 4601315
Windows 8.1, Windows Server 2012 R2, and Windows Server 2012CriticalRemote Code ExecutionWindows 8.1 and Windows Server 2012 R2 Monthly Rollup: 4601384 Windows 8.1 and Windows Server 2012 R2 Security Only: 4601349 Windows Server 2012 Monthly Rollup: 4601348 Windows Server 2012 Security Only: 4601357
Microsoft Office-related softwareImportantRemote Code Execution4493211, 4493222, 4493196, 4493192, 4493204
Microsoft SharePoint-related softwareImportantRemote Code Execution4493210, 4493194, 4493195, 4493223
Microsoft Lync/Skype for BusinessImportantDenial of Service5000675, 5000688
Microsoft Exchange ServerImportantSpoofing4602269, 4571787
Microsoft .NET-related softwareCriticalRemote Code Execution4601318, 4601050, 4601887, 4603004, 4602960, 4603005, 4602961, 4601354, 4601056, 4603003, 4602959, 4603002, 4602958, 4601051, 4601054
Microsoft Visual StudioImportantRemote Code ExecutionFind details on security updates for Visual Studio-related software in the Security Update Guide: https://msrc.microsoft.com/update-guide
Microsoft Dynamics-related softwareImportantInformation Disclosure4602915
Microsoft Azure-related softwareImportantElevation of PrivilegeFind details on security updates for Azure-related software in the Security Update Guide: https://msrc.microsoft.com/update-guide
Developer toolsImportantRemote Code ExecutionFind details on security updates for developer tools in the Security Update Guide: https://msrc.microsoft.com/update-guide

Notes:

Security vulnerability overview:

Below is a summary showing the number of vulnerabilities addressed in this release, broken down by product/component and by impact.

Vulnerability DetailsRCEEOPIDSFBDOSSPFTMPPublicly DisclosedKnown ExploitMax CVSS
Windows 10 v20H2 & Windows Server v20H210752400319.8
Windows 10 v2004 & Windows Server v200410752400319.8
Windows 10 v1909 & Windows Server v190910652300319.8
Windows 10 v1809 & Windows Server 201910752300319.8
Windows 10 v18037642300319.8
Windows Server 201610531200109.8
Windows 8.1 & Server 2012 R27430200109.8
Windows Server 20127430200109.8
Microsoft Office-related software4000000007.8
Microsoft SharePoint-related software2010010008.8
Lync/Skype for Business0000110006.5
Microsoft Exchange Server0000020006.5
Microsoft .NET-related software2000200008.1
Microsoft Visual Studio-related software2000100107.8
Microsoft Dynamics-related software0010010006.5
Microsoft Azure-related software0200000007.0
Developer tools1100000007.8
RCE = Remote Code Execution | EOP = Elevation of Privilege | ID = Information Disclosure | SFB = Security Feature Bypass | DOS = Denial of Service | SPF = Spoofing | TMP = Tampering

Resources for deploying updates to remote devices:

Part 1: Helping businesses rapidly set up to work securely from personal PCs and mobiles
Part 2: Helping IT send and provision business PCs at home to work securely during COVID-19
Part 3: Manage work devices at home during Covid-19 using Configuration Manager
Part 4: Managing remote machines with cloud management gateway (CMG)
Part 5: Managing Patch Tuesday with Configuration Manager in a remote work world

See also:
Mastering​ Configuration Manager Bandwidth limitations for VPN connected Clients

Vulnerability details for the current month:

Below are summaries for some of the security vulnerabilities in this release:

Attack VectorThis metric reflects the context by which vulnerability exploitation is possible. The Base Score increases the more remote (logically, and physically) an attacker can be in order to exploit the vulnerable component.
Attack ComplexityThis metric describes the conditions beyond the attacker’s control that must exist in order to exploit the vulnerability. Such conditions may require the collection of more information about the target or computational exceptions. The assessment of this metric excludes any requirements for user interaction in order to exploit the vulnerability. If a specific configuration is required for an attack to succeed, the Base metrics should be scored assuming the vulnerable component is in that configuration.
Privileges RequiredThis metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.
User InteractionThis metric captures the requirement for a user, other than the attacker, to participate in the successful compromise the vulnerable component. This metric determines whether the vulnerability can be exploited solely at the will of the attacker, or whether a separate user (or user-initiated process) must participate in some manner.
CVE-2021-1727Windows Installer Elevation of Privilege Vulnerability
ImpactElevation of Privilege
SeverityImportant
Publicly Disclosed?Yes
Known Exploits?No
ExploitabilityExploitation more likely
CVSS Base Score7.8
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareAll supported versions of Windows
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1727
CVE-2021-1732Windows Win32k Elevation of Privilege Vulnerability
ImpactElevation of Privilege
SeverityImportant
Publicly Disclosed?No
Known Exploits?Yes
ExploitabilityExploitation detected
CVSS Base Score7.8
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareWindows 10 v20H2, Windows 10 v2004, Windows 10 v1909, Windows 10 v1809, Windows 10 v1803, Windows Server v20H2, Windows Server v2004, Windows Server v1909, and Windows Server 2019
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1732
CVE-2021-24074Windows TCP/IP Remote Code Execution Vulnerability
ImpactRemote Code Execution
SeverityCritical
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation more likely
CVSS Base Score9.8
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareAll supported versions of Windows
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24074
CVE-2021-24094Windows TCP/IP Remote Code Execution Vulnerability
ImpactRemote Code Execution
SeverityCritical
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation more likely
CVSS Base Score9.8
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareAll supported versions of Windows
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24094
CVE-2021- 24077Windows Fax Service Remote Code Execution Vulnerability
ImpactRemote Code Execution
SeverityCritical
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation less likely
CVSS Base Score9.8
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareAll supported versions of Windows
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24077
CVE-2021-24078Windows DNS Server Remote Code Execution Vulnerability
ImpactRemote Code Execution
SeverityCritical
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation more likely
CVSS Base Score9.8
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareWindows Server v20H2, Windows Server v2004, Windows Server v1909, Windows Server 2019, Windows Server 2016, Windows Server 2012 R2, and Windows Server 2012
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24078
CVE-2021-24088Windows Local Spooler Remote Code Execution Vulnerability
ImpactRemote Code Execution
SeverityCritical
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation less likely
CVSS Base Score8.8
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareAll supported versions of Windows
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24088
CVE-2021-24098Windows Console Driver Denial of Service Vulnerability
ImpactDenial of Service
SeverityImportant
Publicly Disclosed?Yes
Known Exploits?No
ExploitabilityExploitation less likely
CVSS Base Score5.5
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
Affected SoftwareWindows 10 v20H2, Windows 10 v2004, Windows 10 v1909, Windows 10 v1809, Windows 10 v1803, Windows Server v20H2, Windows Server v2004, Windows Server v1909, and Windows Server 2019
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24098
CVE-2021-24066Microsoft SharePoint Remote Code Execution Vulnerability
ImpactRemote Code Execution
SeverityImportant
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation more likely
CVSS Base Score8.8
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareMicrosoft SharePoint Server 2019, Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Foundation 2013 Service Pack 1, and Microsoft SharePoint Foundation 2010 Service Pack 2
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24066
CVE-2021-24067Microsoft Excel Remote Code Execution Vulnerability
ImpactRemote Code Execution
SeverityImportant
Publicly Disclosed?No
Known Exploits?No
ExploitabilityExploitation less likely
CVSS Base Score7.8
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected SoftwareMicrosoft 365 Apps for Enterprise, Excel 2016, Excel 2013, Excel 2010, Office Online Server, Office 2019, Office 2019 for Mac, and Office Web Apps Server 2013
More Informationhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24067 

February 2021 Microsoft Office security updates

Microsoft Office security updates are delivered through the Microsoft Update platform and via the Download Center.

Patched Office security vulnerabilities – (Source: Bleeping Computer)

This month’s Office security updates address bugs exposing Windows systems running vulnerable Click to Run and Microsoft Installer (.msi) based editions of Microsoft Office products to remote code execution (RCE), information disclosure, and spoofing attacks.

Microsoft rated the six RCE bugs patched in February 2021 as Important severity issues given that they could enable attackers to execute arbitrary code in the context of the currently logged-in user.

Following successful exploitation, attackers could install malicious programs, view, change, and delete data, as well as make their own admin accounts on exploited Windows devices.

TagCVE IDCVE TitleSeverity
Microsoft Office ExcelCVE-2021-24067Microsoft Excel Remote Code Execution VulnerabilityImportant
Microsoft Office ExcelCVE-2021-24068Microsoft Excel Remote Code Execution VulnerabilityImportant
Microsoft Office ExcelCVE-2021-24069Microsoft Excel Remote Code Execution VulnerabilityImportant
Microsoft Office ExcelCVE-2021-24070Microsoft Excel Remote Code Execution VulnerabilityImportant
Microsoft Office SharePointCVE-2021-24071Microsoft SharePoint Information Disclosure VulnerabilityImportant
Microsoft Office SharePointCVE-2021-1726Microsoft SharePoint Spoofing VulnerabilityImportant
Microsoft Office SharePointCVE-2021-24066Microsoft SharePoint Remote Code Execution VulnerabilityImportant
Microsoft Office SharePointCVE-2021-24072Microsoft SharePoint Server Remote Code Execution VulnerabilityImportant

Further information about each of them is available within the knowledge base articles linked below.

Microsoft Office 2016:

ProductKnowledge Base article title and number
Excel 2016Description of the security update for Excel 2016: February 9, 2021 (KB4493196)
Office 2016February 2, 2021, update for Office 2016 (KB4493189)
Outlook 2016February 2, 2021, update for Outlook 2016 (KB4493190)
PowerPoint 2016February 2, 2021, update for PowerPoint 2016 (KB4493164)

Microsoft Office 2013:

ProductKnowledge Base article title and number
Excel 2013Description of the security update for Excel 2013: February 9, 2021 (KB4493211)
Office 2013February 2, 2021, update for Office 2013 (KB4486684)
PowerPoint 2013February 2, 2021, update for PowerPoint 2013 (KB4493169)

Microsoft Office 2010:

ProductKnowledge Base article title and number
Excel 2010Description of the security update for Excel 2010: February 9, 2021 (KB4493222)
Office 2010February 2, 2021, update for Office 2010 (KB4493180)
PowerPoint 2010February 2, 2021, update for PowerPoint 2010 (KB4493179)

Microsoft SharePoint Server 2019:

ProductKnowledge Base article title and number
Office Online ServerDescription of the security update for Office Online Server: February 9, 2021 (KB4493192)
SharePoint Server 2019Description of the security update for SharePoint Server 2019: February 9, 2021 (KB4493194)
SharePoint Server 2019 Language PackFebruary 9, 2021, update for SharePoint Server 2019 Language Pack (KB4493193)

Microsoft SharePoint Server 2016:

ProductKnowledge Base article title and number
SharePoint Enterprise Server 2016Description of the security update for SharePoint Enterprise Server 2016: February 9, 2021 (KB4493195)

Microsoft SharePoint Server 2013:

ProductKnowledge Base article title and number
Office Web Apps Server 2013Description of the security update for Office Web Apps Server 2013: February 9, 2021 (KB4493204)
Project Server 2013February 9, 2021, cumulative update for Project Server 2013 (KB4493207)
SharePoint Enterprise Server 2013February 9, 2021, cumulative update for SharePoint Enterprise Server 2013 (KB4493209)
SharePoint Foundation 2013Description of the security update for SharePoint Foundation 2013: February 9, 2021 (KB4493210)
SharePoint Foundation 2013February 9, 2021, cumulative update for SharePoint Foundation 2013 (KB4493205)

Microsoft SharePoint Server 2010:

ProductKnowledge Base article title and number
Project Server 2010February 9, 2021, update for Project Server 2010 (KB4475537)
Project Server 2010February 9, 2021, cumulative update for Project Server 2010 (KB4493217)
SharePoint Foundation 2010Description of the security update for SharePoint Foundation 2010: February 9, 2021 (KB4493223)
SharePoint Server 2010February 9, 2021, cumulative update for SharePoint Server 2010 (KB4493220)
SharePoint Server 2010February 9, 2021, update for SharePoint Server 2010 (KB4493212)
SharePoint Server 2010 Office Web AppsFebruary 9, 2021, update for SharePoint Server 2010 Office Web Apps (KB4493219)

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.