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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.4099 Advisory (icsa-21-336-04) Hitachi Energy RTU500 series BCI 3 December 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Hitachi Energy RTU500 series BCI Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-35533 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-336-04 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-336-04) Hitachi Energy RTU500 series BCI Original release date: December 02, 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 7.5 o ATTENTION: Exploitable remotely/low attack complexity o Vendor: Hitachi Energy o Equipment: RTU500 series Bidirectional Communication Interface (BCI) o Vulnerability: Improper Input Validation 2. RISK EVALUATION Successful exploitation of this vulnerability could allow a remote attacker to reboot the device. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following firmware versions of RTU500 series, a remote terminal unit, are affected: o RTU500 series CMU Firmware Version 12.0: All versions o RTU500 series CMU Firmware Version 12.2: All versions o RTU500 series CMU Firmware Version 12.4: All versions 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER INPUT VALIDATION CWE-20 An issue exists in the BCI IEC 60870-5-104 function included in the affected products. If BCI IEC 60870-5-104 is enabled and configured, an attacker could exploit the vulnerability by sending a specially crafted message to the affected product, causing it to reboot. This vulnerability is caused by the validation error in the APDU parser of the BCI IEC 60870-5-104 function. CVE-2021-35533 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is ( AV:N/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 Energy reported this vulnerability to CISA. 4. MITIGATIONS Hitachi Energy recommends the following: o Disable BCI IEC 60870-5-104 function by configuration if it is not used. Note: By default, the BCI IEC 60870-5-104 is disabled. o Update to RTU500 series CMU Firmware Version 12.6.5.0 or later (e.g., RTU500 CMU Firmware Version 12.7.* or CMU Firmware Version 13.2.* or later). Please see Hitachi Energy advisory 8DBD000063 for additional mitigation and update information. 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 unauthorized personnel. o Do not directly connect to the Internet. o Separated from other networks by means of a firewall system with 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.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. 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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