{"id":20285,"date":"2020-10-21T10:54:11","date_gmt":"2020-10-21T02:54:11","guid":{"rendered":"https:\/\/version-2.com\/?p=20285"},"modified":"2022-03-07T14:44:17","modified_gmt":"2022-03-07T06:44:17","slug":"cvss-8-6-dos-vulnerability-in-mitsubishi-electric-melsec-iq-r-series-cpu","status":"publish","type":"post","link":"https:\/\/version-2.com\/zh\/2020\/10\/cvss-8-6-dos-vulnerability-in-mitsubishi-electric-melsec-iq-r-series-cpu\/","title":{"rendered":"CVSS 8.6 DoS Vulnerability in Mitsubishi Electric MELSEC iQ-R Series CPU"},"content":{"rendered":"\t\t
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Our Researchers Discover Another Vulnerability\u00a0<\/strong><\/h4>\n

As part of our mission to secure the world\u2019s OT, IoT and Cyber Physical infrastructures, we invest resources into offensive research of vulnerabilities and attack techniques.\n<\/p>

\nCVE-2020-16850 (US ICS-CERT<\/a>) is a\u00a0CVSS 8.6<\/strong>\u00a0remote CPU DoS vulnerability in Mitsubishi Electric iQ-R Series that has been discovered by SCADAfence researcher Yossi Reuven.\n<\/p>

\nMitsubishi Electric is one of the world\u2019s leading electronics and electrical equipment manufacturing companies, and is in use by many of our customers.\u00a0We have been working with Mitsubishi Electric for the last few months<\/a>\u00a0in handling multiple vulnerabilities, and on October 8th, Mitsubishi Electric published an official security advisory reporting this vulnerability and its mitigations.\n<\/p>

\nAbout The Vulnerability \u2013 CVE-2020-16850<\/strong>\n<\/p>

\nMELSEC iQ-R Series is Mitsubishi Electric flagship product line \u2013 designed for high productivity automation systems. iQ-R CPUs\u2019 communication with GX Works 3 (Engineering software package) is done via Mitsubishi Electric proprietary protocol MELSOFT (which works on both TCP and UDP).\n<\/p>

\nA\u00a0single<\/strong>\u00a0specially crafted packet sent by an attacker over the MELSOFT UDP protocol on port 5006 will cause a denial-of-service (DoS) vulnerability due to uncontrolled resource consumption (CWE-400). The PLC\u2019s CPU will get into fault mode, causing a hardware failure (error code: 0x3C00 \u2013 hardware failure). The PLC then becomes unresponsive and requires a manual restart to recover.\n\n

What SCADAfence Recommends Vendors To Do<\/strong><\/h4>\n\n

Perform an Industrial Vulnerability Management Process<\/strong>\n<\/p>

\nPlease refer to our guide on this topic:\u00a0https:\/\/www.scadafence.com\/public-preview-a-comprehensive-guide-to-industrial-device-patching\/<\/a>\n<\/p>

\nMonitor for Unauthorized Network Activity and Exploitation<\/strong>\n<\/p>

\nSome devices will always remain unpatched. Monitoring is an early warning system that allows you to act before attackers have gained full control over your network.\n<\/p>

\nUpgrade to the Latest Firmware (When Available)<\/strong>\n<\/p>

\nCurrently no firmware update is available (will be released soon by Mitsubishi Electric)\n<\/p>

\nPrevent Unauthorized and Untrusted Access<\/strong>\n<\/p>

\n\u2013 Use a firewall or virtual private network (VPN), etc. to prevent unauthorized access when Internet access is required.\n<\/p>

\n\u2013 Use within a LAN and block access from untrusted networks and hosts through firewalls.\n<\/p>

\nBlock UDP Port 5006 and Use MELSOFT TCP<\/strong>\n<\/p>

\nMELSOFT is an engineering software for Mitsubishi PLCs and gives users the option to use either the (connectionless) UDP and (connection-oriented) TCP protocols for programming and configuring the devices. SCADAfence recommends to block Block UDP port 5006 since the cyberattack leverages the connectionless UDP protocol and can cause the PLCs to stop functioning and cause a denial of service. Instead, users should use the TCP protocol for communicating with devices in the shop floor or the control network.\n<\/p>

\nSpecial Thanks & Recognition<\/strong>\n<\/p>

\nThe SCADAfence Research team would like to thank the Mitsubishi Electric team for a speedy vulnerability reporting process even during the challenging COVID-19 times.\n<\/p>

\nSCADAfence is committed to continued research of offensive technologies and development of new defensive technologies.\n<\/p>

\nExploit PoC<\/strong>\n<\/p>

\nWe wrote a Python POC (GPLv3) script of the exploit in action.\n<\/p>

\nCurrently, there\u2019s no patch available. As a result, we limit the access to the exploit to vetted individuals only. The exploit is only available for educational and legal research purposes.\n<\/p>

\nWarning:\u00a0The script will crash the PLC\u2019s CPU \u2013\u00a0do not use it in production.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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About Version 2 Digital<\/h3>

Version 2 Digital is one of the most dynamic IT companies in Asia. The company distributes a wide range of IT products across various areas including cyber security, cloud, data protection, end points, infrastructures, system monitoring, storage, networking, business productivity and communication products.\n

\nThrough an extensive network of channels, point of sales, resellers, and partnership companies, Version 2 offers quality products and services which are highly acclaimed in the market. Its customers cover a wide spectrum which include Global 1000 enterprises, regional listed companies, different vertical industries, public utilities, Government, a vast number of successful SMEs, and consumers in various Asian cities.<\/p><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t\n\t\t

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About SCADAfence<\/strong>
SCADAfence helps companies with large-scale operational technology (OT) networks embrace the benefits of industrial IoT by reducing cyber risks and mitigating operational threats. Our non-intrusive platform provides full coverage of large-scale networks, offering best-in-class detection accuracy, asset discovery and user experience. The platform seamlessly integrates OT security within existing security operations, bridging the IT\/OT convergence gap. SCADAfence secures OT networks in manufacturing, building management and critical infrastructure industries. We deliver security and visibility for some of world\u2019s most complex OT networks, including Europe\u2019s largest manufacturing facility. With SCADAfence, companies can operate securely, reliably and efficiently as they go through the digital transformation journey.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Our Researchers Discover Another Vulnerability\u00a0 As part […]<\/p>\n","protected":false},"author":143524195,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[417,61,99],"tags":[98,418],"class_list":["post-20285","post","type-post","status-publish","format-standard","hentry","category-scadafence","category-press-release","category-year2020","tag-98","tag-scadafence"],"acf":[],"yoast_head":"\nCVSS 8.6 DoS Vulnerability in Mitsubishi Electric MELSEC iQ-R Series CPU - Version 2<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.scadafence.com\/vulnerability-in-mitsubishi-electric-melsec-iq-r-series\" \/>\n<meta property=\"og:locale\" content=\"zh_HK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CVSS 8.6 DoS Vulnerability in Mitsubishi Electric MELSEC iQ-R Series CPU - 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