CVE-2021-35535 : What You Need to Know
Learn about CVE-2021-35535, an Insecure Boot Image vulnerability in Hitachi Energy Relion Relion 670/650/SAM600-IO series, impacting availability, confidentiality, and integrity of systems. Discover mitigation steps and best practices.
A detailed analysis of the Insecure Boot Image vulnerability in Hitachi Energy Relion Relion 670/650/SAM600-IO series, its impact, technical details, and mitigation steps.
Understanding CVE-2021-35535
This section provides an overview of the vulnerability affecting Hitachi Energy Relion devices.
What is CVE-2021-35535?
The Insecure Boot Image vulnerability in Hitachi Energy Relion Relion 670/650/SAM600-IO series allows attackers to exploit a small time gap during the boot process, potentially causing denial-of-service attacks.
The Impact of CVE-2021-35535
With a CVSS base score of 8.1, this vulnerability has a high impact on the availability, confidentiality, and integrity of affected systems.
Technical Details of CVE-2021-35535
This section delves into the specifics of the vulnerability, affected systems, and the exploitation mechanism.
Vulnerability Description
The vulnerability arises from an insecure boot process in Hitachi Energy Relion Relion 670/650/SAM600-IO series, allowing attackers to disrupt device operations.
Affected Systems and Versions
Products such as Relion 670 Series, Relion 670/650 Series, and Relion 670/650/SAM600-IO running specific firmware versions are impacted by this vulnerability.
Exploitation Mechanism
Attackers gaining access to the front network port can exploit the booting process time gap, targeting older VxWorks versions to trigger denial-of-service.
Mitigation and Prevention
This section outlines immediate and long-term measures to address CVE-2021-35535 and prevent potential exploitation.
Immediate Steps to Take
Users are advised to refer to the cybersecurity advisories provided by Hitachi Energy to mitigate the vulnerability's exploitation.
Long-Term Security Practices
Implementing secure boot configurations, network segmentation, and regular security updates can enhance the resilience of affected systems.
Patching and Updates
Regularly applying security patches and firmware updates from Hitachi Energy is crucial to safeguard against known vulnerabilities.