7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.6 High
AI Score
Confidence
High
0.004 Low
EPSS
Percentile
73.4%
This updated advisory is a follow-up to the original advisory titled ICSA-19-346-02 Omron PLC CJ and CS Series (Update A) published November 29, 2022, on the ICS webpage at cisa.gov.
Successful exploitation of these vulnerabilities could allow an attacker to pose as an authorized user to obtain the status information of the PLC.
The following versions of Omron Programmable Logic Controllers are affected:
4.2.1 AUTHENTICATION BYPASS BY SPOOFING CWE-290
An attacker could spoof arbitrary messages or execute commands.
CVE-2019-18259 has been assigned to this vulnerability. A CVSS v3 base score of 5.6 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L).
4.2.2 AUTHENTICATION BYPASS BY CAPTURE-REPLAY CWE-294
An attacker could monitor traffic between the PLC and the controller, and replay requests that could result in the opening and closing of industrial valves.
CVE-2019-13533 has been assigned to this vulnerability. A CVSS v3 base score of 8.1 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:H).
--------- Begin Update B Part 1 of 1 ---------
4.2.3 UNRESTRICTED EXTERNALLY ACCESSIBLE LOCK CWE-412
Omronβs CS and CJ series PLCs have an unrestricted externally accessible lock vulnerability.
CVE-2019-18269 has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H).
--------- End Update B Part 1 of 1 ---------
Jipeng You (XDU) and n0b0dy reported these vulnerabilities to CISA.
Omron recommends the following mitigation measures:
For more information provided by Omron on these vulnerabilities refer to Vulnerabilities in Omron CS and CJ series CPU PLCs.
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
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.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.gov in the Technical Information Paper, ICS-TIP-12-146-01BβTargeted 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 these vulnerabilities.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-13533
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-18259
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-18269
cwe.mitre.org/data/definitions/290.html
cwe.mitre.org/data/definitions/294.html
cwe.mitre.org/data/definitions/412.html
gcc01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.omron-cxone.com%2Fsecurity%2F2019-12-06_PLC_EN.pdf&data=02%7C01%7Ckent.norris%40inl.gov%7C20bf150382654ea6bed508d77a33e9d1%7C4cf464b7869a42368da2a98566485554%7C0%7C1%7C637112235716101466&sdata=HF291pOMe65LwSvq4DynQqT%2FX7Sw%2BT92JGwRsXmC7WU%3D&reserved=0
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:H
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www.us-cert.gov/ics
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www.us-cert.gov/ics/alerts/ICS-ALERT-10-301-01
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www.us-cert.gov/ics/tips/ICS-TIP-12-146-01B
www.us-cert.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
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mailto:?subject=Omron%20PLC%20CJ%20and%20CS%20Series%20%28Update%20B%29&body=www.cisa.gov/news-events/ics-advisories/icsa-19-346-02
7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.6 High
AI Score
Confidence
High
0.004 Low
EPSS
Percentile
73.4%