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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.4662 Advisory (icsa-22-263-02) Hitachi Energy AFF660/665 Series 21 September 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Hitachi Energy AFF660/665 Series Publisher: ICS-CERT Operating System: Network Appliance Resolution: Mitigation CVE Names: CVE-2020-6994 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-22-263-02 Comment: CVSS (Max): 9.8 CVE-2020-6994 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) CVSS Source: ICS-CERT Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-22-263-02) Hitachi Energy AFF660/665 Series Original release date: September 20, 2022 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 9.8 o ATTENTION: Exploitable remotely/low attack complexity o Vendor: Hitachi Energy o Equipment: AFF660/665 Firewall o Vulnerability: Stack-based Buffer Overflow 2. RISK EVALUATION Successful exploitation of this vulnerability could overflow a buffer on the device and fully compromise it. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of Hitachi Energy AFF660/665, an industrial firewall, are affected: o Hitachi Energy AFF660 FW: Versions 03.0.02 and prior o Hitachi Energy AFF665 FW: Versions 03.0.02 and prior 3.2 VULNERABILITY OVERVIEW 3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121 An improper parsing of URL arguments allows an attacker to exploit this vulnerability by crafting specially formed HTTP requests to overflow an internal buffer. Successful exploitation could cause a full compromise of the device. CVE-2020-6994 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:H/ I:H/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 for AFF660 FW and AFF665 FW versions 03.0.02 and prior recommends users to implement the following security measures: o Use the "IP Access Restriction" feature to restrict HTTP and HTTPS traffic to trusted IP addresses. o Disable the HTTP and HTTPS server. Hitachi Energy recommends users follow the recommended security practices and firewall configurations to help protect from outside attacks. Recommended security practices include: o Ensuring process control systems are physically protected from unauthorized direct access o Ensuring process control systems have no direct connections to the Internet o Using a firewall system to separate process control systems from separated from other networks. The firewall system should have only the necessary ports open. Hitachi Energy does not recommend process control systems be used for internet surfing, instant messaging, or receiving emails. Portable computers and removable storage media should be carefully scanned for viruses before they are connected to a control system. For more information, see Hitachi Energy's security advisory 8DBD000122 . CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability these vulnerabilities. Specifically, users should: 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 its 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 at cisa.gov/ics . Several CISA products detailing cyber defense best 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 at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies . Organizations observing suspected malicious activity should follow established internal procedures and report 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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: https://auscert.org.au/gpg-key/ iQIVAwUBYyptgMkNZI30y1K9AQh6wg/+OT+iYpXcC1x6rLWqSGa479cKz8SR7xdj boX6og1xsJBNRLVQ5WdJrBXOIXy3SP9RyI4U2ZG6FVu3OITqgGadtcRJkiIOuytQ pVq0i9E/hhBvXhUaAkNw2iZHIDdb4vxW5NoVtanmxgw31ZCqVYgjhQIswoDhlfL9 83c+RC9x1Osk+PSv2sJ32kf/ffuhhyJAF6geYoKs6tu4FXRHF987fP/EIobgF1H0 rjyyk+7Z0rkROH6cPiw+jwsKtWt6JIhBudCwFseYY0R5CZaFx2e7bthcrY8yQO3V KQLL3qH8NcJzWxx0rf60AKx9Y9zJe+nImeuyfB/giEjthK8gGBhywf9b4DCptyLy LqTR2Ws++gnkaS5sRxKmPFYMewZbjqkJDYTaZQDGysh+vg9kJMHf7eCol2aCdY8O +hzia3fkej4fIK86G6bE750GnVIlOITMWbqjg2EMbyG153h8sXNHaBrcAwf5qzg5 RDRPPIO+arJu+vEJeetotO4BxrMShACz6tafMGhaAbyVAAwNTBCWDAjOjgzLHsj4 8uL4fzRtCjkKGtYHnCvPWqKaGMM+7qhP9yLkh+gHyusHr9/IE/7oJzQiMcQ7Ikr9 rGuNNB9pHk8wRBpFB2uTs5HeZbKrAW30uA2cho0tkLZvNlZ27KPG89Eek9HfVdMJ caeAcG1jXmI= =ZQWO -----END PGP SIGNATURE-----