[Tech-l] FW: UPDATED - MS-ISAC CYBERSECURITY ADVISORY - Critical Patches Issued for Microsoft Products, April 13, 2021 - PATCH: NOW - TLP: WHITE

[Thor Sage]

Sorry for the multiple emails.  Please find the additional advisory for Microsoft products below.
Thanks,
Thor


Thor Sage
Executive Director
Miami Valley Educational Computer Association
937-767-1468  x3101
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Not-for-profit Technology Services for Education and Local Governments


From: MS-ISAC Advisory <MS-ISAC.Advisory at msisac.org>
Sent: Tuesday, April 13, 2021 9:42 PM
To: Michael Aliperti <Michael.Aliperti at cisecurity.org>
Subject: UPDATED - MS-ISAC CYBERSECURITY ADVISORY - Critical Patches Issued for Microsoft Products, April 13, 2021 - PATCH: NOW - TLP: WHITE
Importance: High


TLP: WHITE

MS-ISAC CYBERSECURITY ADVISORY

MS-ISAC ADVISORY NUMBER:
2021-046 - UPDATED

DATE(S) ISSUED:
04/13/2021 - UPDATED

SUBJECT:
UPDATED - Critical Patches Issued for Microsoft Products, April 13, 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 no reports of these vulnerabilities being exploited in the wild.

April 13 – UPDATED THREAT INTELLIGENCE:

The following CVEs were disclosed publicly but are not known to be exploited in the wild:

  *   CVE-2021-27091 - RPC Endpoint Mapper Service Elevation of Privilege Vulnerability
  *   CVE-2021-28312 - Windows NTFS Denial of Service Vulnerability
  *   CVE-2021-28437 - Windows Installer Information Disclosure Vulnerability – PolarBear
  *   CVE-2021-28458 - Azure ms-rest-nodeauth Library Elevation of Privilege Vulnerability

CVE-2021-28310 (Win32k Elevation of Privilege Vulnerability) was discovered by Kaspersky and they are reporting that this vulnerability is possibly being exploited by the BITTER APT group.

SYSTEMS AFFECTED:

  *   Azure AD Web Sign-in
  *   Azure DevOps
  *   Azure Sphere
  *   Microsoft Edge (Chromium-based)
  *   Microsoft Exchange Server
  *   Microsoft Graphics Component
  *   Microsoft Internet Messaging API
  *   Microsoft NTFS
  *   Microsoft Office Excel
  *   Microsoft Office Outlook
  *   Microsoft Office SharePoint
  *   Microsoft Office Word
  *   Microsoft Windows Codecs Library
  *   Microsoft Windows Speech
  *   Open Source Software
  *   Role: DNS Server
  *   Role: Hyper-V
  *   Visual Studio
  *   Visual Studio Code
  *   Visual Studio Code - GitHub Pull Requests and Issues Extension
  *   Visual Studio Code - Kubernetes Tools
  *   Visual Studio Code - Maven for Java Extension
  *   Windows Application Compatibility Cache
  *   Windows AppX Deployment Extensions
  *   Windows Console Driver
  *   Windows Diagnostic Hub
  *   Windows Early Launch Antimalware Driver
  *   Windows ELAM
  *   Windows Event Tracing
  *   Windows Installer
  *   Windows Kernel
  *   Windows Media Player
  *   Windows Network File System
  *   Windows Overlay Filter
  *   Windows Portmapping
  *   Windows Registry
  *   Windows Remote Procedure Call Runtime
  *   Windows Resource Manager
  *   Windows Secure Kernel Mode
  *   Windows Services and Controller App
  *   Windows SMB Server
  *   Windows TCP/IP
  *   Windows Win32K
  *   Windows WLAN Auto Config 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/en-us

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:

  *   https://msrc.microsoft.com/update-guide
  *   https://msrc.microsoft.com/update-guide/releaseNote/2021-Apr

April 13 – UPDATED REFERENCES:
Bleeping Computer:
https://www.bleepingcomputer.com/news/microsoft/microsoft-april-2021-patch-tuesday-fixes-108-flaws-5-zero-days/



TLP: WHITE
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This message and attachments may contain confidential information. If it appears that this message was sent to you by mistake, any retention, dissemination, distribution or copying of this message and attachments is strictly prohibited. Please notify the sender immediately and permanently delete the message and any attachments.

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