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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-21-245-02) JTEKT TOYOPUC TCC-6353 PC10G-CPU
3 September 2021
AusCERT Security Bulletin Summary
Product: JTEKT TOYOPUC Products
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2021-33011
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ICS Advisory (ICSA-21-245-02)
JTEKT TOYOPUC Products
Original release date: September 02, 2021
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
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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/
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Japan
Yenting Lee of Trend Micro, working with Trend Micro's Zero Day Initiative,
reported this vulnerability to CISA.
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
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:
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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