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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.4729 Advisory (icsa-19-318-04) Omron CX-Supervisor (Update A) 20 December 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Omron CX-Supervisor Publisher: ICS-CERT Operating System: Windows Impact/Access: Administrator Compromise -- Remote with User Interaction Denial of Service -- Remote with User Interaction Access Confidential Data -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2019-18251 Reference: ESB-2019.4314 Original Bulletin: https://www.us-cert.gov/ics/advisories/icsa-19-318-04 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-19-318-04) Omron CX-Supervisor (Update A) Original release date: December 19, 2019 Legal Notice All information products included in http://ics-cert.us-cert.gov 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 http://www.us-cert.gov/tlp/ . 1. EXECUTIVE SUMMARY o CVSS v3 8.8 o ATTENTION: Exploitable remotely/low skill level to exploit o Vendor: Omron o Equipment: CX-Supervisor o Vulnerability: Use of Obsolete Function 2. UPDATE INFORMATION This updated advisory is a follow-up to the original advisory titled ICSA-19-318-04 Omron CX-Supervisor that was published November 14, 2019, on the ICS webpage on us-cert.gov. 3. RISK EVALUATION Successful exploitation of this vulnerability could result in information disclosure, total compromise of the system, and system unavailability. 4. TECHNICAL DETAILS 4.1 AFFECTED PRODUCTS The following versions of both "Full Development" and "Runtime Only" packages of Omron's SCADA and HMI package CX-Supervisor are affected: o CX-Supervisor Versions 3.5 (12) and prior 4.2 VULNERABILITY OVERVIEW 4.2.1 USE OF OBSOLETE FUNCTION CWE-477 - --------- Begin Update A Part 1 of 1 --------- Omron CX-Supervisor ships with TeamViewer Version 5.0.8703 QS. This version of TeamViewer is vulnerable to an obsolete function vulnerability that requires user interaction to exploit. Version 5.0.8703 QS of TeamViewer is vulnerable to the items listed at the following location: Version 5.0.8703 QS TeamViewer vulnerabilities . - --------- End Update A Part 1 of 1 --------- CVE-2019-18251 has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:R/S:U/ C:H/I:H/A:H ). 4.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Energy o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Japan 4.4 RESEARCHER Michael DePlante of Trend Micro's Zero Day Initiative reported this vulnerability to CISA. 5. MITIGATIONS Omron recommends users update to CX-Supervisor Version 3.51 (9). The following link contains Omron's explanation for the changes and instructions to obtain the update: CX-Supervisor Version 3.51 (9) update . CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: o Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet . 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 that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the 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 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-12-146-01B--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. CISA also recommends users take the following measures to protect themselves from social engineering attacks: o Do not click web links or open unsolicited attachments in 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 this vulnerability. - --------------------------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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXfwYwWaOgq3Tt24GAQiMrQ//c1F/OXGjn5BJpkkFdtzJ3Mi49385Cjkj QeBLyf1yfry2qDejNp9On4JXUA9pfixo7ZiXmFFwSI0zVnmcMWK/ItpuCS/P62ea tuWzG9ir3m1Uq5Fe8oSoFICMRu4XNkZTbUAkEqOSNyhOu8w2YeEDcl2ljqq6KfY5 V4IQqkUVlq1YQwjqEQ3e66fQ2zpFk1m3984Ea9hFLPDSdFxsH7khnCEozybRoNUC OpTbiPztXYbA/J3ZYrMNtOwz5zCU8ivhF13AMXT86QU8eFMWDR2JQp7p8OfWm6IR 3kGbGTTx+WlNaYbhrWiTu0mTkodDVmPj8TNF7sCljto71nH0q7OvhTLWBe2OupUN QTwQP3G3z8CXS2yJKK889qb2KhXqHghKfiSCiC1RaQkv4v+cchMiB8ZS/knBOwH9 J++lHu1rIZHBGh65fA3L+0ukuu6Dbevqn6kTCJykdafwj1A552BQEcxznigfh5y1 gseZXzyxTgMOWN811I+9XChdoAK5KNoxTnYwlaqznKitX0qD0QpiF8Gzx+pXSZhk IfeaIa/jfqKofajxr8eBgZnM7Sr43Fs3GA9IhnMzlYRqcF6ndP3PXuwtDlfSkvLO paRcYg+P/HzHVYhYRrrT9UkBR9+vVhnfykRiZWVlmikgxo+GEGrfJTzZCGjvxrz3 EIb2LXs/PVY= =ur9K -----END PGP SIGNATURE-----