CVE-2021-26370 : What You Need to Know
Understand CVE-2021-26370 affecting 2nd & 3rd Gen AMD EPYC processors. Learn about impacts, technical details, and mitigation steps to enhance system security.
This article provides an overview of CVE-2021-26370, detailing the vulnerability, impact, technical details, and mitigation steps.
Understanding CVE-2021-26370
CVE-2021-26370 is a security vulnerability related to improper validation of destination addresses in AMD EPYC processors, specifically affecting 2nd Gen and 3rd Gen AMD EPYC products.
What is CVE-2021-26370?
The vulnerability arises from improper validation of destination addresses in certain firmware loading mechanisms, which could potentially allow an attacker to overwrite critical bootloader memory with malicious content.
The Impact of CVE-2021-26370
If exploited, this vulnerability could lead to a loss of integrity and availability of affected systems. Attackers may overwrite bootloader memory with SPI ROM contents, potentially causing serious security implications.
Technical Details of CVE-2021-26370
This section dives into the specific technical aspects of the CVE.
Vulnerability Description
The vulnerability arises from improper validation of destination address in SVC_LOAD_FW_IMAGE_BY_INSTANCE and SVC_LOAD_BINARY_BY_ATTRIB in a malicious UApp or ABL, enabling attackers to overwrite bootloader memory with SPI ROM contents.
Affected Systems and Versions
The vulnerability affects 2nd Gen AMD EPYC with versions less than RomePI-SP3_1.0.0.C and 3rd Gen AMD EPYC with versions less than MilanPI-SP3_1.0.0.4.
Exploitation Mechanism
Attackers can exploit this vulnerability through malicious UApps or ABL to overwrite critical bootloader memory with SPI ROM contents.
Mitigation and Prevention
This section outlines steps to mitigate and prevent exploitation of CVE-2021-26370.
Immediate Steps to Take
Immediate steps involve applying security patches provided by AMD, updating firmware, and implementing secure boot mechanisms.
Long-Term Security Practices
Long-term security practices include regular security updates, threat monitoring, and ensuring robust system security configurations.
Patching and Updates
It is crucial to promptly install security patches released by AMD to address the vulnerability and enhance system security.