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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.2176 Advisory (icsa-20-175-01) Mitsubishi Electric MELSEC iQ-R, iQ-F, Q, L and FX Series CPU Modules 24 June 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Mitsubishi Electric MELSEC Publisher: US-CERT Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Unauthorised Access -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2020-14476 Original Bulletin: https://www.us-cert.gov/ics/advisories/icsa-20-175-01 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-20-175-01) Mitsubishi Electric MELSEC iQ-R, iQ-F, Q, L and FX Series CPU Modules Original release date: June 23, 2020 Legal Notice All information products included in https://us-cert.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://www.us-cert.gov/tlp/ . 1. EXECUTIVE SUMMARY o CVSS v3 10.0 o ATTENTION: Exploitable remotely/low skill level to exploit o Vendor: Mitsubishi Electric o Equipment: MELSEC o Vulnerability: Cleartext Transmission of Sensitive Information 2. RISK EVALUATION Successful exploitation of this vulnerability could allow information disclosure, information tampering, unauthorized operation, or a denial-of-service condition. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS Mitsubishi Electric reports the vulnerability affects the following MELSEC products: o MELSEC iQ-R, iQ-F, Q, L and FX series CPU modules, all versions 3.2 VULNERABILITY OVERVIEW 3.2.1 CLEARTEXT TRANSMISSION OF SENSITIVE INFORMATION CWE-319 There is a vulnerability due to cleartext communication between Mitsubishi Electric MELSEC iQ-R, iQ-F, Q, L, and FX series CPU modules, and GX Works3/GX Works2. There are risks of communication data eavesdropping/tampering, unauthorized operation, and denial-of-service (DoS) attacks from attackers. CVE-2020-14476 has been assigned to this vulnerability. A CVSS v3 base score of 10.0 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:C/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 Shunkai Zhu, Rongkuan Ma and Peng Cheng from NESC Lab of Zhejiang University reported this vulnerability to Mitsubishi Electric. 4. MITIGATIONS Mitsubishi Electric recommends encrypting the communication path by setting up a VPN to mitigate the impact of this vulnerability. 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. 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 iQIVAwUBXvKSSuNLKJtyKPYoAQhh8w//edrpy4Vi5ccO035dcBb6e6wkOh9XToM5 5LzhuNU4x3tqmqe05RhbObesYjARdOaX3Gfkem2TSlDYF37gpD4RlnUs8xyRtHM0 NzfY74uCmjmxEzDChO3afWtl0flDcqESC4NTHxiQ7PHcBkri775TgvxZsDlYdMzC CLz+ffq2DncNpbCdczrctcb8YU7LUJSYZzuIgXz4IdflrchKfEO3gB82kur04ayD hqx4HT/mBt7uyevspMjeZxw3jJaXHHS2py0GAwMkmLeBv8kYTtZ7dW9UUQMxH38r tyiaFrKsbJqzNO6fq4vHFWxKX8jgYMMveJtCyv4Fo65wQ7qRd3CjuoGDMlpfoR85 tZD7YOW2mtE4tJzSuS42t1lTb2NoY+/1ThO8MEGpNc4hI1vgscwraN18zAHfpyjX m2fNISS3rZCPgc6YdzgO9LymKlfJCtJJAp00f/OQNKf+VNzBVAEoK8HLiAHSe1O3 mRu7ralxQLM8ax5RiUFZOYBdVtmDAD5TTYmfnJUCFgCdlOPkgcRgzV6r7pQl2UVf fBoBGOi2zvFIEe+M7UMEjHF+MPQqsAnGk5fLTx8eP18UXixD73pvUYSt+SWycGoD D2dWCDGAv6Py3NJ1DVW2B2PO/mxSp6vrPJ8XpnNzI/q8cbcxOXT1I1nLZOcGyjc7 5Timrs7NuEM= =DUFs -----END PGP SIGNATURE-----