High Threat Security Alert (A21-10-11): Multiple Vulnerabilities in Microsoft Products (October 2021)


 

Published on: 15 October 2021

  
  

Description:

Microsoft has released security updates addressing multiple vulnerabilities which affect several Microsoft products or components. The list of security updates can be found at:

https://msrc.microsoft.com/update-guide/en-us/releaseNote/2021-Oct

Reports indicated that an elevation of privilege vulnerability in Microsoft Windows and Server (CVE-2021-40449) is being actively exploited. System administrators are advised to take immediate action to patch your affected systems to mitigate the elevated risk of cyber attacks.

 

Affected Systems:

  • Microsoft Windows 7, 8.1, RT 8.1, 10, 11
  • Microsoft Windows Server 2008, 2008 R2, 2012, 2012 R2, 2016, 2019, 2022
  • Microsoft Windows Server, version 2004, version 20H2
  • Microsoft Office 2013, 2013 RT, 2016, 2019, 2019 for Mac, LTSC 2021, LTSC for Mac 2021
  • Microsoft Office Online Server
  • Microsoft Office Web Apps Server 2013
  • Microsoft Excel 2013, 2013 RT, 2016
  • Microsoft Word 2013, 2013 RT, 2016
  • Microsoft 365 Apps for Enterprise
  • Microsoft Dynamics 365 (on-premises) version 9.0, version 9.1
  • Microsoft Dynamics 365 Customer Engagement V9.0, V9.1
  • Microsoft Exchange Server 2013, 2016, 2019
  • Microsoft SharePoint Foundation 2013
  • Microsoft SharePoint Enterprise Server 2013, 2016
  • Microsoft SharePoint Server 2019
  • Microsoft Visual Studio 2017, 2019
  • System Center 2012 R2 Operations Manager, 2016 Operations Manager, 2019 Operations Manager
  • .NET 5.0
  • PowerShell 7.1
  • Intune management extension

 

Impact:

Depending on the vulnerability exploited, a successful attack could lead to remote code execution, elevation of privilege, information disclosure, denial of service, security feature bypass and spoofing.

 

Recommendation:

Patches for affected products are available from the Windows Update / Microsoft Update Catalog.  Users of affected systems should follow the recommendations provided by the product vendor and take immediate actions to mitigate the risk.

 

More Information:

  • https://msrc.microsoft.com/update-guide/en-us/releaseNote/2021-Oct
  • https://www.hkcert.org/security-bulletin/microsoft-monthly-security-update-october-2021
  • https://us-cert.cisa.gov/ncas/current-activity/2021/10/12/microsoft-releases-october-2021-security-updates
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1971
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3449 (to CVE-2021-3450)
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26427
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26441 (to CVE-2021-26442)
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-34453
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-36953
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-36970
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38662 (to CVE-2021-38663)
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38672
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40443
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40449 (to CVE-2021-40450)
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40454 (to CVE-2021-40457)
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-40460 (to CVE-2021-40489)
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41330 (to CVE-2021-41332)
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41334 (to CVE-2021-41340)
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41342 (to CVE-2021-41348)
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41350
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41352 (to CVE-2021-41355)
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41357
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41361
  • https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41363


Tag: Microsoft , Windows , Windows Server , Microsoft Office , Microsoft Office Web Apps , Excel , Word , Microsoft 365 Apps , Dynamics 365 , Exchange Server , SharePoint , Visual Studio , System Center , .NET , PowerShell , Intune Management Extension
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