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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-21-336-05) Hitachi Energy Relion 670/650/SAM600-IO
3 December 2021
AusCERT Security Bulletin Summary
Product: Hitachi Energy Relion 670/650/SAM600-IO
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
CVE Names: CVE-2021-35535
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ICS Advisory (ICSA-21-336-05)
Hitachi Energy Relion 670/650/SAM600-IO
Original release date: December 02, 2021
All information products included in https://us-cert.cisa.gov/ics are provided
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1. EXECUTIVE SUMMARY
o CVSS v3 8.1
o Vendor: Hitachi Energy
o Equipment: Relion 670/650/SAM600-IO
o Vulnerability: Insecure Default Initialization of Resource
2. RISK EVALUATION
Successful exploitation of this vulnerability could hijack existing TCP
sessions to inject packets of their choosing or cause denial-of-service
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Hitachi Energy reports this vulnerability affects the following Relion
o Relion 670/650 series: All revisions of Version 2.2.0
o Relion 670/650/SAM600-IO series: All revisions of Version 2.2.1
o Relion 670 series: All revisions of Version 2.2.2
o Relion 670 series: All revisions of Version 2.2.3 until 188.8.131.52
o Relion 670/650 series: All revisions of Version 2.2.4
3.2 VULNERABILITY OVERVIEW
3.2.1 INSECURE DEFAULT INITIALIZATION OF RESOURCE CWE-1188
A vulnerability exists in the early boot process of the product in which there
is a tiny time gap where a previous version of VxWorks is loaded prior to
booting up the complete application firmware. The older version of VxWorks is
susceptible to Urgent/11, which may allow for remote code execution on the
device before the operating system is loaded.
CVE-2021-35535 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been calculated; the CVSS vector string is ( AV:L/AC:H/PR:N/UI:N/S:C/
o CRITICAL INFRASTRUCTURE SECTORS: Energy
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Switzerland
A Department of Energy CyTRICS researcher from Idaho National Laboratory
reported this vulnerability to Hitachi Energy.
Hitachi Energy recommends the following actions to mitigate this vulnerability:
o Relion 670/650 series Version 2.2.0: Upgrade to Version 2.2.5
o Relion 670/650/SAM600-IO series Version 2.2.1: Upgrade to Version 2.2.5
o Relion 670 series Version 2.2.2: Upgrade to Version 2.2.5
o Relion 670 series Version 2.2.3: Update to Revision 184.108.40.206 or upgrade to
o Relion 670/650 series Version 2.2.4: Upgrade to Version 2.2.5
Hitachi Energy recommends the following security practices and firewall
configurations to help protect process control networks from attacks that
originate from outside the network:
o Physically protect process control systems from direct access by
o Do not directly connect to the Internet.
o Separate from other networks by means of a firewall system that has a
minimal number of ports exposed.
o Process control systems should not be used for Internet surfing, instant
messaging, or receiving e-mails.
o Portable computers and removable storage media should be carefully scanned
for viruses before they are connected to a control system.
Please see Hitachi Energy advisory 8DBD000061 for additional mitigation and
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.cisa.gov . Several recommended practices are
available for reading and download, including Improving Industrial Control
Systems Cybersecurity with Defense-in-Depth Strategies .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage on us-cert.cisa.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
No known public exploits specifically target this vulnerability. This
vulnerability is not exploitable remotely. This vulnerability has a high attack
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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