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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.2983 Advisory (icsa-21-245-02) JTEKT TOYOPUC TCC-6353 PC10G-CPU 3 September 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: JTEKT TOYOPUC Products Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Mitigation CVE Names: CVE-2021-33011 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-245-02 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-245-02) JTEKT TOYOPUC Products Original release date: September 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 4.3 o ATTENTION: Exploitable remotely/low attack complexity o Vendor: JTEKT Corporation o Equipment: TOYOPUC products o Vulnerability: Allocation of Resources Without Limits or Throttling 2. RISK EVALUATION Successful exploitation of this vulnerability could allow a remote attacker to deny Ethernet communications between affected devices without authorization. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of these TOYOPUC products are affected: o TOYOPUC-PC10 Series: PC10G-CPU TCC-6353: All versions PC10GE TCC-6464: All versions PC10P TCC-6372: All versions PC10P-DP TCC-6726: All versions PC10P-DP-IO TCC-6752: All versions PC10B-P TCC-6373: All versions PC10B TCC-1021: All versions PC10B-E/C TCU-6521: All versions PC10E TCC-4637: All versions PC10PE TCC-1101: All versions PC10PE-1616P TCC-1102: All versions EF10 TCU-6982: All versions o TOYOPUC-Plus Series: Plus CPU TCC-6740: All versions Plus EX TCU-6741: All versions Plus EX2 TCU-6858: All versions Plus EFR TCU-6743: All versions Plus EFR2 TCU-6859: All versions Plus 2P-EFR TCU-6929: All versions Plus BUS-EX TCU-6900: All versions o TOYOPUC-PC3J/PC2J Series: FL/ET-T-V2H THU-6289: All versions 2PORT-EFR THU-6404: All versions o TOYOPUC-Nano Series Nano 10GX TUC-1157: All versions Nano CPU TUC-6941: All versions Nano 2ET TUU-6949: All versions Nano Safety TUC-1085: All versions Nano Safety RS00IP TUU-1086: All versions Nano Safety RS01IP TUU-1087: All versions 3.2 VULNERABILITY OVERVIEW 3.2.1 ALLOCATION OF RESOURCES WITHOUT LIMITS OR THROTTLING CWE-770 The affected product may not be able to properly process an ICMP flood, which may allow an attacker to deny Ethernet communications between affected devices. CVE-2021-33011 has been assigned to this vulnerability. A CVSS v3 base score of 4.3 has been calculated; the CVSS vector string is ( AV:A/AC:L/PR:N/UI:N/S:U/ C:N/I:N/A:L ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Japan 3.4 RESEARCHER Yenting Lee of Trend Micro, working with Trend Micro's Zero Day Initiative, reported this vulnerability to CISA. 4. MITIGATIONS JTEKT recommends the following workaround for this vulnerability: 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 its connected devices. o Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the Internet . o To prevent unauthorized devices from being connected to the free ports of the HUB, use LAN port lock to close the free ports. Requests for additional information can be sent to JTEKT Corporation via website form . 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. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. 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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