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AUSCERT External Security Bulletin Redistribution
ESB-2021.0941
Advisory (icsa-21-075-03) Hitachi ABB Power Grids AFS Series
17 March 2021
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AusCERT Security Bulletin Summary
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Product: Hitachi ABB Power Grids AFS Series
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-9307
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-075-03
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ICS Advisory (ICSA-21-075-03)
Hitachi ABB Power Grids AFS Series
Original release date: March 16, 2021
Legal Notice
All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For more
information about TLP, see https://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 6.5
o ATTENTION: Low skill level to exploit
o Vendor: Hitachi ABB Power Grids
o Equipment: AFS Series
o Vulnerability: Infinite Loop
2. RISK EVALUATION
Successful exploitation of this vulnerability could cause a denial-of-service
condition on one of the ports in a HSR ring.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Hitachi ABB Power Grids reports the vulnerability affects the following
products in the AFS Series:
o AFS660/AFS665 Version 7.0.07, including the following variants:
AFS660-SR
AFS665-SR
3.2 VULNERABILITY OVERVIEW
3.2.1 INFINITE LOOP CWE-835
A crafted HSR frame can cause a denial-of-service condition on one of the ports
in a HSR ring.
CVE-2020-9307 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been calculated; the CVSS vector string is ( AV:A/AC:L/PR:N/UI:N/S:U/
C:N/I:N/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Energy
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Switzerland
3.4 RESEARCHER
Hitachi ABB Power Grids reported this vulnerability to CISA.
4. MITIGATIONS
Hitachi ABB Power Grids has published an advisory for AFS Series and advises
users to update products with available updates. The update removes the
vulnerability by modifying the way the switch processes HSR frames.
For additional information and support, contact a product provider or Hitachi
ABB Power Grids service organization. For contact information, see Hitachi ABB
Power Grids contact-centers .
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize VPN is only
as secure as the connected devices.
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
Strategies .
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.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
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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