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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.4659 Advisory (icsa-19-346-03) Omron PLC CJ, CS and NJ Series 13 December 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Omron PLC CJ, CS and NJ Series Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Unauthorised Access -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-18269 CVE-2019-18261 CVE-2019-18259 CVE-2019-13533 Original Bulletin: https://www.us-cert.gov/ics/advisories/icsa-19-346-03 https://www.us-cert.gov/ics/advisories/icsa-19-346-02 Comment: This bulletin contains two (2) ICS-CERT security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-19-346-03) Omron PLC CJ, CS and NJ Series Original release date: December 12, 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 6.5 o ATTENTION : Exploitable remotely/low skill level to exploit o Vendor : Omron o Equipment : PLC CJ, CS and NJ Series o Vulnerability : Improper Restriction of Excessive Authentication Attempts 2. RISK EVALUATION Successful exploitation of this vulnerability could allow an attacker to brute force login credentials, obtain unauthorized access of the system, and may allow an attacker unauthorized access to the FTP interface. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of Omron Programmable Logic Controllers are affected: o Omron PLC CS series, all versions o Omron PLC CJ series, all versions o Omron PLC NJ series, all versions 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER RESTRICTION OF EXCESSIVE AUTHENTICATION ATTEMPTS CWE-307 The software does not implement sufficient measures to prevent multiple failed authentication attempts within in a short time frame, making it more susceptible to brute force attacks. CVE-2019-18261 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:L/I:L/A:N ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS : Critical Manufacturing o COUNTRIES/AREAS DEPLOYED : Worldwide o COMPANY HEADQUARTERS LOCATION : Japan 3.4 RESEARCHER n0b0dy reported this vulnerability to CISA. 4. MITIGATIONS Omron recommends the following mitigation measures: o Filter FTP port: Protect access to Omron's PLC with a firewall and block unnecessary remote access to FTP port (default: 21). o Filter IP addresses: Protect access to Omron's PLC with a firewall and filtering devices connected to the PLC by IP address. o Ensure the use of strong passwords. For more information provided by Omron on these vulnerabilities refer to this Omron report . 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. No known public exploits specifically target this vulnerability. - ------------------------------------------------------------------------------- ICS Advisory (ICSA-19-346-02) Omron PLC CJ and CS Series Original release date: December 12, 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 8.6 o ATTENTION : Exploitable remotely/low skill level to exploit o Vendor : Omron o Equipment : PLC CJ and CS Series o Vulnerabilities : Authentication Bypass by Spoofing, Authentication Bypass by Capture-replay, Unrestricted Externally Accessible Lock 2. RISK EVALUATION Successful exploitation of these vulnerabilities could allow an attacker to pose as an authorized user to obtain the status information of the PLC. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of Omron Programmable Logic Controllers are affected: o Omron PLC CJ series, all versions o Omron PLC CS series, all versions 3.2 VULNERABILITY OVERVIEW 3.2.1 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 ). 3.2.2 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 ). 3.2.3 UNRESTRICTED EXTERNALLY ACCESSIBLE LOCK CWE-412 The software properly checks for the existence of a lock, but the lock can be externally controlled or influenced by an actor that is outside of the intended sphere of control. 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 ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS : Critical Manufacturing o COUNTRIES/AREAS DEPLOYED : Worldwide o COMPANY HEADQUARTERS LOCATION : Japan 3.4 RESEARCHER Wang Zhibei and n0b0dy reported these vulnerabilities to CISA. 4. MITIGATIONS Omron recommends the following mitigation measures: o Filter FINS port: Protect access to Omron's PLC with a firewall and blocking unnecessary remote access to FINS port (default: 9600). o Filter IP addresses: Protect access to Omron's PLC with a firewall and filtering devices connected to the PLC by IP address. 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: 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. No known public exploits specifically target these vulnerabilities. - --------------------------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 iQIVAwUBXfLQF2aOgq3Tt24GAQiznQ/+J64AKF1M+MJo/4/U16CVFLr3q/C0AdaX 6ucvVJDNCy1OvWO/QijY3aK90cMJlwGUm92bLLXJRm4abUAcUMC1EPLJn2yTtL/N 5Y4m37uQQkfZtoA8EFjbI5XH4AhHj2gzWL/LLO7zc+Pe8SrUn79PbB+zHQh0XxVq Wh/P0W4AzHhtQU/z0+4Lhq6Op+aumz6TmOtRZggEkArVzO8DZ2TDSKniu0fl75Ct yUE968ZVV3l3CRG6NVdWeIvyvICoiQWWQkROkG9OOofmMvZwuRyv6twkyML7SaEf ffxbEI+So5hHSOG9GTCv1Y4tjYgHHlVISBvdOQBGL512bZ8j3bmix8vP2dY1BFRl 8lv4re7Eatb3yRaSw74HLZR/6lqVbIyH1QJek7/HIahFik8aDb0hPI2ynVMsQLhp LyPayzlhNCPcYX8GV97SzMuOEJjcXFIy1I/eCCH3m6Qxy4l4B0HpPcj500KHdwuH +YDE2CyYqGYNVV6xEcdmr3oowRwrLnAem9peSVyl6LJtCtZnIGoB1/2PMKb4SdTW wxrG4EDMmVxG/2pSMBv6dsq3UEaEAn22x28YdK/x0lj0lvBhUZJp4fE5adyth2YW ouMQIhFOoRmJKYZLS0nkXztnm7l0wZNhNioP+McZFUkWWO81nNSOtmewi0IebRX+ OVuPEydwarY= =7rRq -----END PGP SIGNATURE-----