Security Alert: Microsoft Releases June 2021 Security Updates

JPCERT-AT-2021-0027
JPCERT/CC
2021-06-09

I. Overview

Microsoft has released June 2021 Security Updates to address the vulnerabilities in their products. Remote attackers leveraging these vulnerabilities may be able to execute arbitrary code. It is recommended to check the information provided by Microsoft and apply the updates.

Microsoft Corporation
June 2021 Security Updates
https://msrc.microsoft.com/update-guide/en-us/releaseNote/2021-June

Microsoft Corporation
Release Notes
https://msrc.microsoft.com/update-guide/releaseNote

According to Microsoft, the following six vulnerabilities have been confirmed to be exploited in the wild. Please consider applying the security update programs as soon as possible.

CVE-2021-31955
Windows Kernel Information Disclosure Vulnerability
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-31955

CVE-2021-31956
Windows NTFS Elevation of Privilege Vulnerability
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-31956

CVE-2021-33739
Microsoft DWM Core Library Elevation of Privilege Vulnerability
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-33739

CVE-2021-33742
Windows MSHTML Platform Remote Code Execution Vulnerability
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-33742

CVE-2021-31199
Microsoft Enhanced Cryptographic Provider Elevation of Privilege Vulnerability
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-31199

CVE-2021-31201
Microsoft Enhanced Cryptographic Provider Elevation of Privilege Vulnerability
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-31201

Microsoft Enhanced Cryptographic Provider Elevation of Privilege vulnerabilities (CVE-2021-31199, CVE-2021-31201) are related to Adobe Acrobat and Reader vulnerability (CVE-2021-28550), released in Adobe Security Bulletin APSB21-29 in May 2021.

II. Solution

Please apply the security update programs through Microsoft Update,Windows Update, etc. as soon as possible.

Microsoft Update Catalog
https://www.catalog.update.microsoft.com/

Windows Update: FAQ
https://support.microsoft.com/en-us/help/12373/windows-update-faq

III. References

Microsoft Corporation
Microsoft Security Updates for June 2021 (Monthly) (Japanese)
https://msrc-blog.microsoft.com/2021/06/08/202106-security-updates/

If you have any information regarding this alert, please contact JPCERT/CC.

JPCERT Coordination Center (Early Warning Group)
MAIL: ew-info@jpcert.or.jp
https://www.jpcert.or.jp/english/

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