CVE-2021-42286 Explained : Impact and Mitigation

Windows Core Shell SI Host Extension Framework for Composable Shell Elevation of Privilege Vulnerability was published by Microsoft on November 9, 2021. The vulnerability impacts various Windows versions including Windows 10 and Windows Server.

Understanding CVE-2021-42286

This CVE highlights a privilege elevation vulnerability in the Windows Core Shell SI Host Extension Framework.

What is CVE-2021-42286?

The vulnerability allows an attacker to elevate privileges on the affected Windows systems, potentially leading to unauthorized access or control of the system.

The Impact of CVE-2021-42286

The impact of this vulnerability is rated as HIGH with a CVSS base score of 7.8, signifying a significant threat to affected systems.

Technical Details of CVE-2021-42286

This section covers technical aspects of the vulnerability.

Vulnerability Description

The vulnerability exists in the Windows Core Shell SI Host Extension Framework, allowing malicious actors to execute code with elevated privileges.

Affected Systems and Versions

The following systems and versions are impacted:

Windows 10 Version 21H1
Windows 10 Version 2004
Windows Server version 2004
Windows 10 Version 20H2
Windows Server version 20H2

Exploitation Mechanism

Attackers can exploit this vulnerability by running specially crafted applications to gain elevated privileges on the affected systems.

Mitigation and Prevention

Recommendations to mitigate and prevent exploitation of this vulnerability.

Immediate Steps to Take

Apply security updates provided by Microsoft promptly.
Monitor systems for any suspicious activities that may indicate exploitation.

Long-Term Security Practices

Implement the principle of least privilege to restrict user access.
Conduct regular security audits and penetration testing to identify and address vulnerabilities.

Patching and Updates

Regularly check for and apply security patches released by Microsoft to address this vulnerability.