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AUSCERT External Security Bulletin Redistribution
ESB-2023.2046
ICS Advisory | ICSA-23-096-03 JTEKTÂ ELECTRONICS Kostac PLC
Programming Software
11 April 2023
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AusCERT Security Bulletin Summary
---------------------------------
Product: JTEKT ELECTRONICS Kostac PLC Programming Software
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2023-22424 CVE-2023-22421 CVE-2023-22419
Original Bulletin:
https://www.cisa.gov/news-events/ics-advisories/icsa-23-096-03
Comment: CVSS (Max): 7.8 CVE-2023-22424 (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/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:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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ICS Advisory (ICSA-23-096-03)
JTEKT ELECTRONICS Kostac PLC Programming Software
Release Date
April 06, 2023
1. EXECUTIVE SUMMARY
o CVSS v3 7.8
o ATTENTION: Low attack complexity
o Vendor: JTEKT ELECTRONICS CORPORATION
o Equipment: Kostac PLC Programming Software
o Vulnerabilities: Out-of-bounds Read, Use After Free
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
disclose information or execute arbitrary code.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of JTEKT ELECTRONICS Kostac PLC Programming Software are
affected:
o JTEKT ELECTRONICS Kostac PLC Programing Software: Versions 1.6.9.0 and
earlier
3.2 VULNERABILITY OVERVIEW
3.2.1 OUT-OF-BOUNDS READ CWE-125
When a specially crafted project file is opened, out-of-bounds read occurs when
processing a comment block in stage information because the end of data cannot
be verified.
CVE-2023-22419 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:H/I:H/A:H ).
3.2.2 OUT-OF-BOUNDS READ CWE-125
When a specially crafted project file is opened, out-of-bounds read occurs
because buffer size used by the PLC program instructions is insufficient.
CVE-2023-22421 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:H/I:H/A:H ).
3.2.3 USE AFTER FREE CWE-416
When the maximum number of columns to place the PLC program is out of
specification by opening a specially crafted project file, a process accesses
memory that has already been freed.
CVE-2023-22424 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Japan
3.4 RESEARCHER
Michael Heinzl reported these vulnerabilities to JPCERT/CC.
4. MITIGATIONS
JTEKT ELECTRONICS recommends users to download the following updates:
o Version 1.6.10.0 and above
This version not only addresses the vulnerability, but also takes measures to
prevent crafted project files from being opened. Project files saved with
Version 1.6.9.0 or earlier can be re-saved with Version 1.6.10.0 or above to
enable this tamper-proof feature. Project files saved with Version 1.6.10.0 or
above cannot be opened with Version 1.6.9.0 or earlier.
For more information, see JTEKT ELECTRONICS' Update Notice .
CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls and
isolate them from business networks.
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.
CISA also recommends users take the following measures to protect themselves
from social engineering attacks:
o Do not click web links or open attachments in unsolicited email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
No known public exploits specifically target these vulnerabilities. These
vulnerabilities are not exploitable remotely.
Related Advisories
Apr 06, 2023
ICS Advisory | ICSA-23-096-05
Hitachi Energy MicroSCADA System Data Manager SDM600
Apr 06, 2023
ICS Advisory | ICSA-23-096-01
Industrial Control Links ScadaFlex II SCADA Controllers
Apr 06, 2023
ICS Advisory | ICSA-23-096-04
Korenix Jetwave
Apr 06, 2023
ICS Advisory | ICSA-23-096-06
mySCADA myPRO
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