JPCERT-AT-2021-0045
JPCERT/CC
2021-10-13
Microsoft Corporation
October 2021 Security Updates
https://msrc.microsoft.com/update-guide/en-us/releaseNote/2021-Oct
Microsoft Corporation
Microsoft Security Updates for October 2021 (Monthly) (Japanese)
https://msrc-blog.microsoft.com/2021/10/12/202110-security-updates/
According to Microsoft, among these vulnerabilities, an elevation of privilege vulnerability in Win32k (CVE-2021-40449) has been confirmed to be exploited in the wild. Please consider applying the security update programs as soon as possible.
CVE-2021-40449
Win32k Elevation of Privilege Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-40449
In addition, according to Microsoft, information on the following vulnerabilities have been publicly disclosed while the exploit has not been observed.
CVE-2021-41335
Windows Kernel Elevation of Privilege Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-41335
CVE-2021-41338
Windows AppContainer Firewall Rules Security Feature Bypass Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-41338
CVE-2021-40469
Windows DNS Server Remote Code Execution Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-40469
Microsoft Update Catalog
https://www.catalog.update.microsoft.com/
Windows Update: FAQ
https://support.microsoft.com/en-us/help/12373/windows-update-faq
Microsoft Corporation
Release Notes
https://msrc.microsoft.com/update-guide/releaseNote
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/
JPCERT/CC
2021-10-13
I. Overview
Microsoft has released October 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
October 2021 Security Updates
https://msrc.microsoft.com/update-guide/en-us/releaseNote/2021-Oct
Microsoft Corporation
Microsoft Security Updates for October 2021 (Monthly) (Japanese)
https://msrc-blog.microsoft.com/2021/10/12/202110-security-updates/
According to Microsoft, among these vulnerabilities, an elevation of privilege vulnerability in Win32k (CVE-2021-40449) has been confirmed to be exploited in the wild. Please consider applying the security update programs as soon as possible.
CVE-2021-40449
Win32k Elevation of Privilege Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-40449
In addition, according to Microsoft, information on the following vulnerabilities have been publicly disclosed while the exploit has not been observed.
CVE-2021-41335
Windows Kernel Elevation of Privilege Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-41335
CVE-2021-41338
Windows AppContainer Firewall Rules Security Feature Bypass Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-41338
CVE-2021-40469
Windows DNS Server Remote Code Execution Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-40469
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
Release Notes
https://msrc.microsoft.com/update-guide/releaseNote
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/