CVE-2021-26371 Explained : Impact and Mitigation

This CVE-2021-26371 article provides detailed information about a vulnerability affecting various AMD processors related to potential information disclosure due to a system call manipulation. Find out the impact, technical details, affected systems, and mitigation steps below.

Understanding CVE-2021-26371

This section dives into the specifics of CVE-2021-26371.

What is CVE-2021-26371?

The vulnerability involves a compromised or malicious ABL or UApp manipulating a SHA256 system call to the bootloader. This manipulation exposes ASP memory to userspace, potentially leading to information disclosure.

The Impact of CVE-2021-26371

The vulnerability may result in unauthorized access to sensitive information, posing a risk to the confidentiality of ASP memory data.

Technical Details of CVE-2021-26371

Below are the technical aspects of CVE-2021-26371.

Vulnerability Description

A compromised ABL or UApp can send a manipulated SHA256 system call to the bootloader, exposing ASP memory to userspace.

Affected Systems and Versions

Various AMD processors, including Ryzen and EPYC series, are impacted by this vulnerability due to the affected AGESA package.

Exploitation Mechanism

The exploitation involves malicious entities sending a specific system call to the bootloader to gain unauthorized access to ASP memory.

Mitigation and Prevention

Discover how to address the CVE-2021-26371 vulnerability.

Immediate Steps to Take

AMD recommends applying the necessary patches and security updates released to mitigate the vulnerability exploitation.

Long-Term Security Practices

Continuous monitoring and updating of the systems can help in maintaining a secure environment and preventing potential cyber threats.

Patching and Updates

Stay informed about the latest security advisories provided by AMD for patches and updates related to CVE-2021-26371.