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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.0261 Advisory (icsa-21-021-04) Mitsubishi Electric MELFA 22 January 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Mitsubishi Electric MELFA Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-20586 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-021-04 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-021-04) Mitsubishi Electric MELFA Original release date: January 21, 2021 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 7.5 o ATTENTION: Exploitable remotely/low skill level to exploit o Vendor: Mitsubishi Electric o Equipment: MELFA FR, MELFA CR, MELFA ASSISTA o Vulnerability: Uncontrolled Resource Consumption 2. RISK EVALUATION Successful exploitation of this vulnerability could cause a denial-of-service condition. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS Mitsubishi Electric reports the vulnerability affects the following MELFA robot controllers: o MELFA FR Series RV-#FR$%\-D-@ CR800-#V$D RH-#FRH$&\-D-@ CR800-#HD RH-#FRHR$&\-D-@ CR800-#HRD RV-#FR$%\-R-@ R16RTCPU + CR800-#V$R RH-#FRH$&\-R-@ R16RTCPU + CR800-#HR RH-#FRHR$&\-R-@ R16RTCPU + CR800-#HRR RV-#FR$%\-Q-@ Q172DSRCPU + CR800-#V$Q RH-#FRH$&\-Q-@ Q172DSRCPU + CR800-#HQ RH-#FRHR$&\-Q-@ Q172DSRCPU + CR800-#HRQ o MELFA CR Series RV-8CRL-D-@ CR800-CVD RH-#CRH$&-D-@ CR800-CHD o MELFA ASSISTA: RV-5AS-D-@ CR800-05VD 3.2 VULNERABILITY OVERVIEW 3.2.1 UNCONTROLLED RESOURCE CONSUMPTION CWE-400 These robot controllers may allow an attacker to cause a denial-of-service of the execution of the robot program and the Ethernet communication by sending many packets in a burst over a short period. CVE-2021-20586 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 Industrial Control Security Laboratory of Qi An Xin Group, Inc., reported this vulnerability to Mitsubishi Electric. 4. MITIGATIONS Mitsubishi Electric recommends users take the following mitigation measures to minimize the risk of exploiting this vulnerability: o Use a firewall or virtual private network (VPN), etc. to prevent unauthorized access when Internet access is required. o Use within a LAN and block access from untrusted networks and hosts through firewalls. Please refer to the Mitsubishi Electric website for details on how to check firmware version. Additional information about the vulnerabilities or Mitsubishi Electric's compensating control 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 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.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. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYAoWguNLKJtyKPYoAQixAQ/+KQ39Klunxqw8cQ6lnzhSTBAbbL3XZE6y 3eCOzbyAlhRFwe75XNf1MT9Q9Jqf8tS2CIkXk/KhJBSoio/DIePun4vgAx9QrG+v AHelAB+UxjmffAB7hBaJQvxGmYazdtDJx+FR8OL+8MZHUKz8MqN+FlUP4gmq6Ukg CYBX1HIldUUWLhjmaDWaHBMH6qrDxhg9bTTy1e3IS8chTM5b0jbJ6cBpChtTc6YZ DtHT2x39X2z5ysU26syXXC0EOeW8qCzHpPsgCyo2s21D0BwDwdF+JMmMb7MzeQbc 30bmlfCaEb+pasC4Dk1wd/cjec6tgtllWjlu9DKojhjc70HfMOhobRTEgbEhzHvf V/OJO/SE6skYMFC+/DQ1u7tvEJiw5LSO7roRA+SYQkzkyEX3IK0ci5ss+tsGfSzT tZbLdvS9jXFRqJPvcZpsks9ey6zDjHf03Cr8w/gGt1flTFQVXbM5jF/8D6aiSDU7 Dn0aW1EBiqHsV5ndssWNDJk6UQZ2v1BCtyOcG22lRZFg7ThT1PBasuNv+HxWse03 GlSUQ6CxLSiUSKKL8GmUHksSdBNsX9LpDEojA7yZj4Z41gmiOVrHnVhwE7gEX5qb rKuaAtZr+Y/iKuGCkeQf1rkyqa371rzwaWJj4MKZHTewtOYocB/AB9p5CKBfInzu zAz3b5+2vAs= =o+4k -----END PGP SIGNATURE-----