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Critical Patches Issued for Microsoft Products, September 14, 2021

MS-ISAC ADVISORY NUMBER:

2021-113

DATE(S) ISSUED:

09/14/2021

OVERVIEW:

Multiple vulnerabilities have been discovered in Microsoft products, the most severe of which could allow for arbitrary code execution in the context of the logged on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

THREAT INTELLIGENCE:

There are currently no reports of this vulnerability being exploited in the wild.

SYSTEMS AFFECTED:

  • Azure Open Management Infrastructure
  • Azure Sphere
  • Dynamics Business Central Control
  • Microsoft Accessibility Insights for Android
  • Microsoft Edge (Chromium-based)
  • Microsoft Edge for Android
  • Microsoft MPEG-2 Video Extension
  • Microsoft Office
  • Microsoft Office Access
  • Microsoft Office Excel
  • Microsoft Office SharePoint
  • Microsoft Office Visio
  • Microsoft Office Word
  • Microsoft Windows Codecs Library
  • Microsoft Windows DNS
  • Visual Studio
  • Windows Ancillary Function Driver for WinSock
  • Windows Authenticode
  • Windows Bind Filter Driver
  • Windows BitLocker
  • Windows Common Log File System Driver
  • Windows Event Tracing
  • Windows Installer
  • Windows Kernel
  • Windows Key Storage Provider
  • Windows MSHTML Platform
  • Windows Print Spooler Components
  • Windows Redirected Drive Buffering
  • Windows Scripting
  • Windows SMB
  • Windows Storage
  • Windows Subsystem for Linux
  • Windows TDX.sys
  • Windows Update
  • Windows Win32K
  • Windows WLAN Auto Config Service
  • Windows WLAN Service
 

RISK:

Government:
  • Large and medium government entities: HIGH
  • Small government entities: MEDIUM
Businesses:
  • Large and medium business entities: HIGH
  • Small business entities: MEDIUM
Home Users: LOW

TECHNICAL SUMMARY:

Multiple vulnerabilities have been discovered in Microsoft products, the most severe of which could allow for arbitrary code execution.   A full list of all vulnerabilities can be found at the link below: https://msrc.microsoft.com/update-guide   Successful exploitation of the most severe of these vulnerabilities could result in an attacker gaining the same privileges as the logged-on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

RECOMMENDATIONS:

We recommend the following actions be taken:
  • Apply appropriate patches or appropriate mitigations provided by Microsoft to vulnerable systems immediately after appropriate testing.
  • Run all software as a non-privileged user (one without administrative rights) to diminish the effects of a successful attack.
  • Remind all users not to visit untrusted websites or follow links provided by unknown or untrusted sources.
  • Inform and educate users regarding threats posed by hypertext links contained in emails or attachments especially from untrusted sources.
  • Apply the Principle of Least Privilege to all systems and services.

REFERENCES:

Microsoft:  

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