CVE-2021-46795 : What You Need to Know
Discover the impact of CVE-2021-46795, a TOCTOU vulnerability affecting AMD Ryzen processors. Learn about the exploitation mechanism, affected systems, and mitigation steps.
A TOCTOU vulnerability affecting AMD Ryzen processors.
Understanding CVE-2021-46795
What is CVE-2021-46795?
A time-of-check to time-of-use vulnerability allows attackers to trigger out-of-bounds memory reads through a compromised BIOS, potentially leading to a denial of service.
The Impact of CVE-2021-46795
This vulnerability can result in a denial of service attack, impacting the security and stability of systems using affected AMD Ryzen processors.
Technical Details of CVE-2021-46795
Vulnerability Description
The vulnerability allows attackers to exploit a compromised BIOS, causing the Trusted Execution Environment Operating System to read memory out of bounds.
Affected Systems and Versions
- Affected Systems: Ryzen 5000 Series
- Affected Versions: Various
Exploitation Mechanism
The attacker needs a compromised BIOS to exploit the vulnerability.
Mitigation and Prevention
Immediate Steps to Take
- Apply patches provided by AMD immediately.
- Regularly update BIOS and system firmware.
Long-Term Security Practices
- Employ system monitoring for unusual activities.
- Implement strict BIOS security measures.
Patching and Updates
Regularly check for and apply security updates from AMD.