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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.1867 Advisory (ICSA-19-141-02) Mitsubishi Electric MELSEC-Q Series Ethernet Module 24 May 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Mitsubishi Electric MELSEC-Q Series Ethernet Module Publisher: NCCIC Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-10977 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-19-141-02 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-19-141-02) Mitsubishi Electric MELSEC-Q Series Ethernet Module Original release date: May 21, 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 7.5 o ATTENTION: Exploitable remotely/low skill level to exploit o Vendor: Mitsubishi Electric o Equipment: MELSEC-Q series Ethernet module o Vulnerability: Uncontrolled Resource Consumption 2. RISK EVALUATION Successful exploitation of this vulnerability may render the device unresponsive, requiring a physical reset of the PLC (Programmable Logic Controller). 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following MELSEC-Q series Ethernet module is affected: o QJ71E71-100 serial number 20121 and prior 3.2 VULNERABILITY OVERVIEW 3.2.1 UNCONTROLLED RESOURCE CONSUMPTION CWE-400 An attacker could send crafted TCP packets against the FTP service, forcing the target devices to enter an error mode and cause a denial-of-service condition. CVE-2019-10977 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:N/I:N/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Japan 3.4 RESEARCHER Younes Dragoni and Alessandro Di Pinto of Nozomi Networks reported this vulnerability to Mitsubishi and NCCIC. 4. MITIGATIONS Mitsubishi Electric has released new firmware Version 20122 for the QJ71E71-100 Ethernet module to mitigate the reported vulnerability. Additional information about the vulnerabilities or Mitsubishi Electric's compensating control is available by contacting a local Mitsubishi Electric representative, which can be found at the following location: https://us.mitsubishielectric.com/fa/en/about-us/distributors Mitsubishi Electric strongly recommends that users should operate the affected device behind a firewall. NCCIC 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. NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. 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-CERT website 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 NCCIC for tracking and correlation against other incidents. 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 iQIVAwUBXOdhJWaOgq3Tt24GAQjcTBAAzCFWfzGjeZ7g5M4OHyGSvnLzONHMLdFZ 4qrpT0Nmae+9fnSpnpnts1Y910aLb59n0du6YqBZHLm7cbKvDzMkXQ8WjDrlUsL2 ZjA2UO8R04tLV/fYE0GLdPY1J+fIggjESyPz7jtWaEtT94BRWLLrlYj8CIUsVKgK alBgxK7OpaISj9FhOY8XcmhoydzHKReZRYcgioJH29EAXDbu7cdJiFnZ0UxCHuna YJ3eSwknHOKRvpRmC/KIUDMAiATNXziokI9ZO7s9uW72rVs/L384EpqNC35qqhSI 9I7oq2lrsY9TcY6+aPm3sM+Pfe6rGXCVswah4hSleZOmE2H3O7iLYaSJCkx8S6P4 WrRbuXfXUXOYOiQ/DFRW79IlTFru3wKZY6o8azN7vP1zLUaQF22Zs0zsLVl6Btxs jHBS4XqcU1hR/OM1HBSxoVA9lULCb1FZc1wegTTkIgX4Em2rkHVTEbAoSauHUZVV C6/hyY60ESlWUPH8Vi5n40JuGS58wksQvLuFzqlCRTDXm/FwnzkSAxJk9UiWG2Zr LDVSsbMegpo72WuYRs5s8/4U7c1+NpNeaY7L0JHzrQV9mpOVsAGAGvuJIJP2+smQ Okk37k8aMmv7x5Vf3GVaToA830+Dmh5nSAc/mgzwzzuzwUplZl65MZrS8RTikbbE L3W6Oih/pBM= =uLcY -----END PGP SIGNATURE-----