CVE-2021-43226 Explained : Impact and Mitigation

Windows Common Log File System Driver Elevation of Privilege Vulnerability was published by Microsoft on December 15, 2021.

Understanding CVE-2021-43226

What is CVE-2021-43226?

The CVE-2021-43226 vulnerability is an Elevation of Privilege issue affecting various Microsoft Windows versions, allowing attackers to gain elevated privileges on the targeted system.

The Impact of CVE-2021-43226

The vulnerability has a base severity of HIGH and a CVSS base score of 7.8. It can lead to information disclosure, integrity and availability compromises, and unauthorized control of the affected system.

Technical Details of CVE-2021-43226

Vulnerability Description

The Windows Common Log File System Driver Elevation of Privilege Vulnerability allows attackers to exploit the Windows OS to gain elevated permissions.

Affected Systems and Versions

Windows 10 Version 1809
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows 10 Version 1909
Windows 10 Version 21H1
Windows Server 2022
Windows 10 Version 2004
Windows Server version 2004
Windows 10 Version 21H2
Windows 10 Version 1507
Windows 10 Version 1607
Windows Server 2016
Windows Server 2016 (Server Core installation)
Windows 7
Windows 7 Service Pack 1
Windows 8.1
Windows Server 2008 Service Pack 2
Windows Server 2008 Service Pack 2 (Server Core installation)
Windows Server 2008 Service Pack 2
Windows Server 2008 R2 Service Pack 1
Windows Server 2008 R2 Service Pack 1 (Server Core installation)
Windows Server 2012
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2
Windows Server 2012 R2 (Server Core installation)

Exploitation Mechanism

The vulnerability stems from improper handling of objects in memory by the Common Log File System Driver, leading to privilege escalation exploits.

Mitigation and Prevention

Immediate Steps to Take

Apply security patches provided by Microsoft promptly.
Monitor for any signs of unauthorized system access.
Implement the principle of least privilege to minimize the impact of potential breaches.

Long-Term Security Practices

Conduct regular security audits and vulnerability assessments.
Keep systems updated with the latest security patches.
Educate users on safe computing practices and security awareness.

Patching and Updates

Ensure all affected systems are updated with the latest security patches released by Microsoft.