CVE-2021-42060 : What You Need to Know

An issue was discovered in Insyde InsydeH2O Kernel 5.0 through 05.08.41, Kernel 5.1 through 05.16.41, Kernel 5.2 before 05.23.22, and Kernel 5.3 before 05.32.22. This vulnerability could allow an attacker to escalate privileges to System Management Mode through an Int15ServiceSmm SMM callout.

Understanding CVE-2021-42060

This CVE identifies a System Management Mode vulnerability in Insyde InsydeH2O Kernel versions.

What is CVE-2021-42060?

The vulnerability in the Int15ServiceSmm SMM callout in the specified Insyde InsydeH2O Kernel versions allows an attacker to hijack the code execution flow in System Management Mode, potentially leading to privilege escalation.

The Impact of CVE-2021-42060

Exploiting this vulnerability could result in unauthorized escalation of privileges to System Management Mode (SMM), potentially compromising the security of affected systems.

Technical Details of CVE-2021-42060

This section covers the technical specifics of the CVE issue.

Vulnerability Description

The vulnerability lies in the handling of the Int15ServiceSmm SMM callout in Insyde InsydeH2O Kernel versions, enabling an attacker to take control of code execution in System Management Mode.

Affected Systems and Versions

Insyde InsydeH2O Kernel 5.0 through 05.08.41
Insyde InsydeH2O Kernel 5.1 through 05.16.41
Insyde InsydeH2O Kernel 5.2 before 05.23.22
Insyde InsydeH2O Kernel 5.3 before 05.32.22

Exploitation Mechanism

The vulnerability allows malicious actors to manipulate the Int15ServiceSmm SMM callout, leading to unauthorized privilege escalation to System Management Mode.

Mitigation and Prevention

Protecting systems from CVE-2021-42060 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply security patches provided by Insyde for the affected kernel versions.
Monitor system behavior for any signs of unauthorized access or privilege escalation.
Implement strict access controls and least privilege principles to limit the impact of potential exploits.

Long-Term Security Practices

Regularly update and patch system components to address known vulnerabilities.
Conduct security audits and assessments to detect and mitigate potential risks proactively.
Educate users and IT personnel on best security practices to prevent and respond to security incidents.

Patching and Updates

Ensure timely installation of security patches released by Insyde for the affected InsydeH2O Kernel versions.