---
title: "Hitachi Energy GMS600 Vulnerability Exposes Systems to Decryption Attacks"
short_title: "GMS600 OpenSSL vulnerability exposes critical systems"
description: "Hitachi Energy warns of a timing-based side-channel vulnerability (CVE-2022-4304) in GMS600 versions 1.3.0-1.3.1. Learn mitigation steps and upgrade to secure your infrastructure."
author: "Vitus"
date: 2025-01-24
categories: [Cybersecurity, Vulnerabilities]
tags: [hitachi-energy, openssl, cve-2022-4304, side-channel-attack, critical-infrastructure]
score: 0.75
cve_ids: [CVE-2022-4304]
---
## TL;DR
Hitachi Energy has disclosed a medium-severity vulnerability (CVE-2022-4304) in its GMS600 product, affecting versions 1.3.0 and 1.3.1. The flaw, a timing-based side-channel attack in OpenSSL, could allow attackers to decrypt sensitive data by recovering the pre-master secret. Immediate mitigation includes upgrading to version 1.3.2 and implementing network security best practices.
Main Content
### Introduction
Critical infrastructure sectors worldwide rely on Hitachi Energy’s GMS600 for efficient power grid management. However, a recently disclosed vulnerability in the system’s OpenSSL component poses a significant risk to data confidentiality. CVE-2022-4304, a timing-based side-channel vulnerability, could enable attackers to decrypt application data by exploiting observable discrepancies in server response times. This article explores the technical details, impact, and mitigation strategies for this vulnerability.
### Key Points
- Vulnerability Identified: CVE-2022-4304, a timing-based side-channel flaw in OpenSSL, affects Hitachi Energy GMS600 versions 1.3.0 and 1.3.1.
- Attack Vector: Attackers can send trial messages to the server and measure response times to recover the pre-master secret, enabling decryption of sensitive data.
- Affected Systems: GMS600 devices deployed in critical manufacturing sectors worldwide.
- Severity: Rated 5.9 (Medium) on the CVSS scale, with a high confidentiality impact.
- Mitigation: Upgrade to GMS600 version 1.3.2 and enforce network security best practices.
### Technical Details
#### Vulnerability Overview
CVE-2022-4304 is a timing-based side-channel attack in OpenSSL’s RSA decryption implementation. The flaw exists across all RSA padding modes, including PKCS#1 v1.5, RSA-OEAP, and RSASVE. In a typical TLS connection, RSA is used by clients to encrypt and send a pre-master secret to the server. An attacker who observes a genuine connection can exploit this vulnerability by:
- Sending trial messages to the server.
- Recording the time taken for the server to process each message.
- Analyzing the timing data to recover the pre-master secret after a sufficient number of attempts.
- Decrypting the application data sent over the compromised connection.
## Attack Vector
The attack relies on observable discrepancies in the server’s processing time for decryption operations. By leveraging these discrepancies, attackers can infer sensitive information without direct access to the system. This method is particularly effective in Bleichenbacher-style attacks, where attackers exploit flaws in RSA padding schemes.
### Impact Assessment
#### Affected Systems
- Product: Hitachi Energy GMS600
- Versions: 1.3.0 and 1.3.1
- Sectors: Critical manufacturing, energy, and power grid infrastructure
- Deployment: Worldwide, with a significant presence in Switzerland and other global regions.
#### Potential Risks
- Data Confidentiality: Successful exploitation could lead to the decryption of sensitive application data, including credentials and operational commands.
- Operational Disruption: While the vulnerability does not directly impact availability, decrypted data could be used to launch further attacks, potentially disrupting critical infrastructure operations.
- Compliance Risks: Organizations failing to mitigate this vulnerability may face regulatory scrutiny, particularly in sectors governed by strict cybersecurity standards.
### Mitigation Steps
#### Immediate Actions
1. Upgrade to GMS600 Version 1.3.2: Hitachi Energy has released a patched version to address this vulnerability. Users are urged to upgrade immediately.
2. Network Segmentation: Isolate GMS600 devices from business networks and the internet to limit exposure.
3. Firewall Configuration: Enforce ingress IP allowlisting and apply traffic rate limiting to prevent unauthorized access.
4. Physical Security: Ensure GMS600 systems are physically protected from unauthorized access.
#### Long-Term Strategies
- Regular Security Audits: Conduct periodic assessments of control system networks to identify and address vulnerabilities.
- Employee Training: Educate staff on cybersecurity best practices, including recognizing phishing attempts and avoiding unauthorized software installations.
- Incident Response Plan: Develop and test an incident response plan to ensure rapid action in the event of a breach.
## Conclusion
The disclosure of CVE-2022-4304 in Hitachi Energy’s GMS600 highlights the ongoing risks posed by side-channel attacks in critical infrastructure. While the vulnerability is rated as medium severity, its potential impact on data confidentiality and operational security cannot be underestimated. Organizations must prioritize upgrading to the patched version (1.3.2) and implementing robust network security measures to mitigate risks. Proactive cybersecurity practices are essential to safeguarding critical systems against evolving threats.
## References
[^1]: Hitachi Energy. "CSAF Advisory for GMS600 Vulnerability (CVE-2022-4304)." View CSAF. Retrieved 2025-01-24.
[^2]: CVE Details. "CVE-2022-4304 - OpenSSL Timing-Based Side Channel Vulnerability." View CVE. Retrieved 2025-01-24.
[^3]: CISA. "ICS Advisory (ICSA-26-141-01) - Hitachi Energy GMS600." View Advisory. Retrieved 2025-01-24.
[^4]: MITRE. "CWE-203: Observable Discrepancy." View CWE. Retrieved 2025-01-24.