A vulnerability in MELSEC iQ-R series modules causes uncontrolled resource consumption. When a module receives a specially crafted SLMP packet from a malicious attacker, the program execution and communication could enter a denial-of-service condition.
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.
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For industrial control systems cybersecurity information: https://us-cert.cisa.gov/ics
or incident reporting: https://us-cert.cisa.gov/report
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{"id": "ICSA-20-324-05", "type": "ics", "bulletinFamily": "info", "title": "Mitsubishi Electric MELSEC iQ-R Series", "description": "## 1\\. EXECUTIVE SUMMARY\n\n * **CVSS v3 7.5**\n * **ATTENTION: **Exploitable remotely/low skill to exploit\n * **Vendor: **Mitsubishi Electric\n * **Equipment: **MELSEC iQ-R series\n * **Vulnerability: **Uncontrolled Resource Consumption\n\n## 2\\. RISK EVALUATION\n\nSuccessful exploitation of this vulnerability could cause a denial-of-service condition for the affected product.\n\n## 3\\. TECHNICAL DETAILS\n\n### 3.1 AFFECTED PRODUCTS\n\nMitsubishi Electric reports the vulnerability affects the following MELSEC iQ-R series CPU module products: \n\n * R00/01/02CPU firmware Versions 19 and earlier\n * R04/08/16/32/120(EN)CPU firmware Versions 51 and earlier\n * R08/16/32/120SFCPU firmware Versions 22 and earlier\n * R08/16/32/120PCPU all versions\n * R08/16/32/120PSFCPU all versions\n * RJ71EN71 firmware Versions 47 and earlier\n * RJ71GF11-T2 firmware Versions 47 and earlier\n * RJ72GF15-T2 firmware Versions 07 and earlier\n * RJ71GP21-SX firmware Versions 47 and earlier\n * RJ71GP21S-SX firmware Versions 47 and earlier\n * RJ71C24(-R2/R4) all versions\n * RJ71GN11-T2 all versions \n\n### 3.2 VULNERABILITY OVERVIEW\n\n#### 3.2.1 [UNCONTROLLED RESOURCE CONSUMPTION CWE-400](<https://cwe.mitre.org/data/definitions/400.html>)\n\nA vulnerability in MELSEC iQ-R series modules causes uncontrolled resource consumption. When a module receives a specially crafted SLMP packet from a malicious attacker, the program execution and communication could enter a denial-of-service condition.\n\n[CVE-2020-5668](<http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-5668>) 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](<https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H>)).\n\n### 3.3 BACKGROUND\n\n * **CRITICAL INFRASTRUCTURE SECTORS: **Critical Manufacturing\n * **COUNTRIES/AREAS DEPLOYED:** Worldwide\n * **COMPANY HEADQUARTERS LOCATION:** Japan\n\n### 3.4 RESEARCHER\n\nXiaofei.Zhang reported this vulnerability to Mitsubishi Electric.\n\n## 4\\. MITIGATIONS\n\nMitsubishi Electric has issued the following iQ-R Series firmware versions to address this issue:\n\n * R00/01/02CPU: firmware Versions 20 or later\n * R04/08/16/32/120 (EN) CPU: firmware Versions 52 or later\n * R08/16/32/120SFCPU: firmware Versions 23 or later\n * RJ71EN71: firmware Versions 48 or later\n * RJ71GF11-T2: firmware Versions 48 or later\n * RJ72GF15-T2: firmware Versions 08 or later\n * RJ71GP21-SX: firmware Versions 48 or later\n * RJ71GP21S-SX: firmware Versions 48 or later\n\nMitsubishi Electric also recommends the following practices to minimize the risk of exploiting this vulnerability:\n\n * Use a firewall or virtual private network (VPN), etc., to prevent unauthorized access when Internet access is required.\n * Use within a LAN and block access from untrusted networks and hosts through firewalls.\n\nFor more information about this vulnerability and the associated mitigations, please see the [vulnerability information on the Mitsubishi website](<https://www.mitsubishielectric.com/en/psirt/vulnerability/index.html>).\n\nCISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. \n \nCISA also provides a section for [control systems security recommended practices](<https://us-cert.cisa.gov/ics/recommended-practices>) on the ICS webpage on [us-cert.cisa.gov](<https://us-cert.cisa.gov/ics>). Several recommended practices are available for reading and download, including [Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies](<https://us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf>).\n\nAdditional mitigation guidance and recommended practices are publicly available on the [ICS webpage on us-cert.cisa.gov](<https://us-cert.cisa.gov/ics>) in the Technical Information Paper, [ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies](<https://us-cert.cisa.gov/ics/tips/ICS-TIP-12-146-01B>). \n \nOrganizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.\n\n## \nContact Information\n\nFor any questions related to this report, please contact the CISA at: \n \nEmail: [CISAservicedesk@cisa.dhs.gov](<mailto:cisaservicedesk@cisa.dhs.gov>) \nToll Free: 1-888-282-0870\n\nFor industrial control systems cybersecurity information: https://us-cert.cisa.gov/ics \nor incident reporting: https://us-cert.cisa.gov/report\n\nCISA continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product.\n\nThis product is provided subject to this Notification and this [Privacy & Use](<https://www.dhs.gov/privacy-policy>) policy.\n\n**Please share your thoughts.**\n\nWe recently updated our anonymous [product survey](<https://www.surveymonkey.com/r/CISA-cyber-survey?product=https://us-cert.cisa.gov/ics/advisories/icsa-20-324-05>); we'd welcome your feedback.\n", "published": "2020-11-19T00:00:00", "modified": "2020-11-19T00:00:00", "cvss": {"score": 7.8, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:C"}, "href": "https://www.us-cert.gov/ics/advisories/icsa-20-324-05", "reporter": "Industrial Control Systems Cyber Emergency Response Team", "references": ["https://twitter.com/share?url=https%3A%2F%2Fus-cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-20-324-05", "https://www.facebook.com/sharer.php?u=https%3A%2F%2Fus-cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-20-324-05", "http://www.addthis.com/bookmark.php?url=https%3A%2F%2Fus-cert.cisa.gov%2Fics%2Fadvisories%2Ficsa-20-324-05", "https://cwe.mitre.org/data/definitions/400.html", "http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-5668", "https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "https://www.mitsubishielectric.com/en/psirt/vulnerability/index.html", "https://us-cert.cisa.gov/ics/recommended-practices", "https://us-cert.cisa.gov/ics", "https://us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf", "https://us-cert.cisa.gov/ics", "https://us-cert.cisa.gov/ics/tips/ICS-TIP-12-146-01B", "https://www.dhs.gov/privacy-policy", "https://www.surveymonkey.com/r/CISA-cyber-survey?product=https://us-cert.cisa.gov/ics/advisories/icsa-20-324-05", "http://twitter.com/icscert", "https://www.dhs.gov", "https://www.dhs.gov/freedom-information-act-foia", "https://www.dhs.gov/homeland-security-no-fear-act-reporting", "https://www.dhs.gov/plain-writing-dhs", "https://www.dhs.gov/plug-information", "https://www.oig.dhs.gov/", "https://www.whitehouse.gov/", "https://www.usa.gov/", "https://www.dhs.gov/"], "cvelist": ["CVE-2020-5668"], "lastseen": "2021-02-27T19:48:45", "viewCount": 9, "enchantments": {"dependencies": {"references": [{"type": "cve", "idList": ["CVE-2020-5668"]}], "modified": "2021-02-27T19:48:45", "rev": 2}, "score": {"value": 6.0, "vector": "NONE", "modified": "2021-02-27T19:48:45", "rev": 2}, "vulnersScore": 6.0}, "immutableFields": []}
{"cve": [{"lastseen": "2021-02-02T07:37:10", "description": "Uncontrolled resource consumption vulnerability in MELSEC iQ-R Series modules (R00/01/02CPU firmware version '19' and earlier, R04/08/16/32/120 (EN) CPU firmware version '51' and earlier, R08/16/32/120SFCPU firmware version '22' and earlier, R08/16/32/120PCPU all versions, R08/16/32/120PSFCPU all versions, RJ71EN71 firmware version '47' and earlier, RJ71GF11-T2 firmware version '47' and earlier, RJ72GF15-T2 firmware version '07' and earlier, RJ71GP21-SX firmware version '47' and earlier, RJ71GP21S-SX firmware version '47' and earlier, RJ71C24 (-R2/R4) all versions, and RJ71GN11-T2 all versions) allows a remote unauthenticated attacker to cause an error in a CPU unit and cause a denial-of-service (DoS) condition in execution of the program and its communication, or to cause a denial-of-service (DoS) condition in communication via the module by a specially crafted SLMP packet", "edition": 5, "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "baseScore": 7.5, "privilegesRequired": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "userInteraction": "NONE", "version": "3.1"}, "impactScore": 3.6}, "published": "2020-11-20T04:15:00", "title": "CVE-2020-5668", "type": "cve", "cwe": ["CWE-400"], "bulletinFamily": "NVD", "cvss2": {"severity": "HIGH", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "NONE", "availabilityImpact": "COMPLETE", "integrityImpact": "NONE", "baseScore": 7.8, "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "acInsufInfo": false, "impactScore": 6.9, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-5668"], "modified": "2020-12-08T17:26:00", "cpe": ["cpe:/o:mitsubishielectric:r120pcpu_firmware:*", "cpe:/o:mitsubishielectric:r16cpu_firmware:51", "cpe:/o:mitsubishielectric:r00cpu_firmware:19", "cpe:/o:mitsubishielectric:rj71gp21-sx_firmware:47", "cpe:/o:mitsubishielectric:r120sfcpu_firmware:22", "cpe:/o:mitsubishielectric:rj71gf11-t2_firmware:47", "cpe:/o:mitsubishielectric:rj71c24-r2_firmware:*", "cpe:/o:mitsubishielectric:r32sfcpu_firmware:22", "cpe:/o:mitsubishielectric:r01cpu_firmware:19", "cpe:/o:mitsubishielectric:r04cpu_firmware:51", "cpe:/o:mitsubishielectric:r32psfcpu_firmware:*", "cpe:/o:mitsubishielectric:r120psfcpu_firmware:*", "cpe:/o:mitsubishielectric:r08psfcpu_firmware:*", "cpe:/o:mitsubishielectric:r08pcpu_firmware:*", "cpe:/o:mitsubishielectric:r08cpu_firmware:51", "cpe:/o:mitsubishielectric:rj71en71_firmware:47", "cpe:/o:mitsubishielectric:r08sfcpu_firmware:22", "cpe:/o:mitsubishielectric:rj71c24-r4_firmware:*", 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