CVE-2020-1121 Explained : Impact and Mitigation

An elevation of privilege vulnerability exists when Windows improperly handles calls to Clipboard Service, aka 'Windows Clipboard Service Elevation of Privilege Vulnerability'.

Understanding CVE-2020-1121

This CVE ID is unique from CVE-2020-1111, CVE-2020-1165, CVE-2020-1166.

What is CVE-2020-1121?

CVE-2020-1121 is an elevation of privilege vulnerability in Windows involving the Clipboard Service.

The Impact of CVE-2020-1121

The vulnerability could allow an attacker to elevate their privileges on the affected system.

Technical Details of CVE-2020-1121

Vulnerability Description

The vulnerability arises from Windows mishandling calls to the Clipboard Service.

Affected Systems and Versions

Windows 10 Version 1809 for 32-bit Systems, x64-based Systems, and ARM64-based Systems
Windows Server 2019 and 2019 (Core installation)
Windows 10 Version 1909 and Windows Server, version 1909
Windows 10 Version 1903 and Windows Server, version 1903

Exploitation Mechanism

The vulnerability can be exploited by manipulating calls to the Clipboard Service, potentially leading to privilege escalation.

Mitigation and Prevention

Immediate Steps to Take

Apply security updates provided by Microsoft.
Monitor systems for any unusual activities.
Consider restricting access to the Clipboard Service.

Long-Term Security Practices

Keep systems up to date with the latest security patches.
Conduct regular security audits and assessments.
Educate users on safe computing practices.

Patching and Updates

Ensure that all affected systems are updated with the latest security patches from Microsoft.