CVE-2021-41842 : Vulnerability Insights and Analysis

An issue was discovered in AtaLegacySmm in the kernel 5.0 before 05.08.46, 5.1 before 05.16.46, 5.2 before 05.26.46, 5.3 before 05.35.46, 5.4 before 05.43.46, and 5.5 before 05.51.45 in Insyde InsydeH2O. This vulnerability can lead to code execution due to a lack of a CommBuffer check in the SMI handler.

Understanding CVE-2021-41842

This section provides insights into the nature and impact of the CVE.

What is CVE-2021-41842?

CVE-2021-41842 is an issue found in AtaLegacySmm in Insyde InsydeH2O kernel versions.

The Impact of CVE-2021-41842

The vulnerability allows for code execution by exploiting the SMI handler's missing CommBuffer check.

Technical Details of CVE-2021-41842

Here, we delve into the technical aspects of the CVE.

Vulnerability Description

The vulnerability arises in AtaLegacySmm in specific kernel versions due to a missing CommBuffer check.

Affected Systems and Versions

Versions 5.0 to 5.5 before specific subversions are affected by this vulnerability.

Exploitation Mechanism

Code execution can be triggered by taking advantage of the absence of a CommBuffer check in the SMI handler.

Mitigation and Prevention

Learn how to address and prevent the CVE.

Immediate Steps to Take

Update to the patched versions provided by the vendor.
Implement strict input validation mechanisms.
Monitor and restrict access to sensitive system areas.

Long-Term Security Practices

Conduct regular security audits and vulnerability assessments.
Train personnel on secure coding practices and threat awareness.

Patching and Updates

Apply security patches as soon as they are released by the vendor to mitigate the vulnerability.