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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.2013.2 Advisory (icsa-20-161-02) Mitsubishi Electric MELSEC iQ-R series 6 November 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Mitsubishi Electric MELSEC iQ-R series Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2020-13238 Original Bulletin: https://www.us-cert.gov/ics/advisories/icsa-20-161-02 Revision History: November 6 2020: ICS-CERT appended Update B to advisory June 10 2020: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-20-161-02) Mitsubishi Electric MELSEC iQ-R Series (Update B) Original release date: November 05, 2020 Legal Notice 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 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 https://us-cert.cisa.gov/tlp/ . 1. EXECUTIVE SUMMARY o CVSS v3 5.3 o ATTENTION: Exploitable remotely/low skill level to exploit o Vendor: Mitsubishi Electric o Equipment: MELSEC iQ-R Series o Vulnerability: Resource Exhaustion 2. UPDATE INFORMATION This updated advisory is a follow-up to the advisory update titled ICSA-20-161-02 Mitsubishi Electric MELSEC iQ-R series (Update A) that was published June 16, 2020 to the ICS webpage on us-cert.cisa.gov. 3. RISK EVALUATION Successful exploitation of this vulnerability could cause the Ethernet port to enter a denial-of-service condition. 4. TECHNICAL DETAILS 4.1 AFFECTED PRODUCTS - --------- Begin Update B Part 1 of 2 --------- Mitsubishi Electric reports that the vulnerability affects the following MELSEC iQ-R series modules: o R00/01/02CPU: Firmware Versions 7 or earlier o R04/08/16/32/120CPU, R04/08/16/32/120ENCPU: Firmware Versions 39 or earlier o R08/16/32/120SFCPU: Firmware Versions 20 or earlier o R08/16/32/120PCPU: Firmware Versions 24 or earlier o R08/16/32/120PSFCPU: Firmware Versions 05 or earlier RJ71EN71: Firmware This updated advisory is a follow-up to the advisory update titled ICSA-20-161-02 Mitsubishi Electric MELSEC iQ-R series (Update A) that was published June 16, 2020 on the ICS webpage on us-cert.cisa.gov. o Versions 49 or earlier - --------- End Update B Part 1 of 2 --------- 4.2 VULNERABILITY OVERVIEW 4.2.1 UNCONTROLLED RESOURCE CONSUMPTION ('RESOURCE EXHAUSTION') CWE-400 Uncontrolled resource consumption can be caused when an attacker sends a large amount of specially crafted packets in bursts over a short period. CVE-2020-13238 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:N/I:N/A:L ). 4.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Japan 4.4 RESEARCHER Yossi Reuven of SCADAfence reported this vulnerability to Mitsubishi Electric. 5. MITIGATIONS - --------- Begin Update B Part 2 of 2 --------- Mitsubishi Electric has fixed the following versions to discard packets when specially crafted packets are received: o R00/01/02CPU: Firmware Versions 8 or later o R04/08/16/32/120CPU, R04/08/16/32/120ENCPU: Firmware Versions 40 or later o R08/16/32/120SFCPU: Firmware Versions 21 or later o R08/16/32/120PCPU: Firmware Versions 25 or later o R08/16/32/120PSFCPU: Firmware Versions 06 or later o RJ71EN71: Firmware Versions 50 or later - --------- EndUpdate B Part 2 of 2 --------- Mitsubishi Electric recommends users of the affected devices take the following measures for cyber-attacks such as DoS attack or unauthorized access from untrusted networks or hosts. o Connection to untrusted networks or hosts: Check whether the modules mounted in the equipment used are connected to untrusted networks or hosts. o Firewalls: If the modules are connected to untrusted networks or hosts, check whether measures such as firewalls are properly configured. o Additional information about the vulnerability is available by contacting a Mitsubishi Electric representative . CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: o Use secure methods when remote access is required, 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.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 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. For any questions related to this report, please contact the CISA at: Email: CISAservicedesk@cisa.dhs.gov 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. - --------------------------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 iQIVAwUBX6TMS+NLKJtyKPYoAQjwLQ/9E9eIwhy9JUSOT+820/6O2xOPe9AnbJjf 8FSwNnRBXlUy9xglIEAXlaov2eiuryfy/0yo5E3DtneHZpG3mBoeYjRHeu7kgrcF 7Yia6QDr1TBZbwd7lqsJAA/ajkk/21AhoV2zCkXQfAGktqCq1PsyskHsPud0+H5r zBFZ7SbNsKHgguFQwAdOOo51C0vS7rxlT54Be2N9AgF16Pa6jUJqF3fJx5cV1bb1 CrcEAuGY9qMA/Wd+VSH9153LRq3q2tpfQp1Q1TTvpJNSratBFvbsLfnpdAYqDyG5 yUwxjoX6Aj5LatWP6/V+x/WmtL3MGaxocfXvFocCY8ZzD0QLcqlLAfoWhW//oBGd Y5aT/CmphMZ5wL7ojq/Ey3rjHsM7XPW7R1oZaKbCRLUrB11P2IpILb1fDG1PVLAz hEwO2vzQq7mudIrFr4vt9Cpm8gINL+2ANXTUxwpzVQQ/z0XXVPxiczyEtlfuBu74 oRczFVtVueW6eEk3Gx4Ngped8ysPESdKThSq0gOchotPi0RhXEzN7gEqdmZ29aIZ +MjgdQqJDoed/ZKp/okNK8gX4DxjXKXrMmnUFHhYw7e3B8sm1Zazd19edIY9ZqVa Rtjj52wwTKGavsdPr18xFefIkERVXavLtuMt0dij5YL3dpMJbpAllejYdg2FF9Sy TtPdNxeTPaA= =DUTX -----END PGP SIGNATURE-----