{
  "document": {
    "acknowledgments": [
      {
        "organization": "Mitsubishi Electric",
        "summary": "reporting this vulnerability to CISA"
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Disclosure is not limited",
      "tlp": {
        "label": "WHITE",
        "url": "https://us-cert.cisa.gov/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "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/.",
        "title": "Legal Notice"
      },
      {
        "category": "summary",
        "text": "Successful exploitation of this vulnerability could allow an attacker to bypass authentication and log in by connecting to the module via telnet to reset the module or, if certain conditions are met, either disclose or tamper with the module\u0027s configuration, or rewrite the firmware.",
        "title": "Risk evaluation"
      },
      {
        "category": "other",
        "text": "Critical Manufacturing",
        "title": "Critical infrastructure sectors"
      },
      {
        "category": "other",
        "text": "Worldwide",
        "title": "Countries/areas deployed"
      },
      {
        "category": "other",
        "text": "Japan",
        "title": "Company headquarters location"
      },
      {
        "category": "general",
        "text": "CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.",
        "title": "Recommended Practices"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "central@cisa.dhs.gov",
      "name": "CISA",
      "namespace": "https://www.cisa.gov/"
    },
    "references": [
      {
        "category": "self",
        "summary": "ICS Advisory ICSA-23-138-02 JSON",
        "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2023/icsa-23-138-02.json"
      },
      {
        "category": "self",
        "summary": "ICSA Advisory ICSA-23-138-02 - Web Version",
        "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-23-138-02"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/resources-tools/resources/ics-recommended-practices"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/topics/industrial-control-systems"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf"
      },
      {
        "category": "external",
        "summary": "Recommended Practices",
        "url": "https://www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B"
      }
    ],
    "title": "Mitsubishi Electric MELSEC WS Series",
    "tracking": {
      "current_release_date": "2023-08-22T06:00:00.000000Z",
      "generator": {
        "engine": {
          "name": "CISA CSAF Generator",
          "version": "1.0.0"
        }
      },
      "id": "ICSA-23-138-02",
      "initial_release_date": "2023-05-18T06:00:00.000000Z",
      "revision_history": [
        {
          "date": "2023-05-18T06:00:00.000000Z",
          "legacy_version": "Initial",
          "number": "1",
          "summary": "Initial Publication"
        },
        {
          "date": "2023-08-22T06:00:00.000000Z",
          "legacy_version": "Update to affected products and mitigations",
          "number": "2",
          "summary": "Update to affected products and mitigations"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c= Serial Numbers 2310****",
                "product": {
                  "name": "WS0-GETH00200: \u003c= Serial Numbers 2310****",
                  "product_id": "CSAFPID-0001"
                }
              }
            ],
            "category": "product_name",
            "name": "WS0-GETH00200"
          }
        ],
        "category": "vendor",
        "name": "Mitsubishi Electric"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2023-1618",
      "cwe": {
        "id": "CWE-489",
        "name": "Active Debug Code"
      },
      "notes": [
        {
          "category": "summary",
          "text": "In the affected products, the hidden telnet function is enabled by default when shipped from the factory. An authentication bypass vulnerability could allow a remote unauthenticated attacker to log into the affected module by connecting to it via telnet.",
          "title": "Vulnerability Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-0001"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "web.nvd.nist.gov",
          "url": "http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-1618"
        },
        {
          "category": "external",
          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Mitsubishi Electric has released the following versions to fix this vulnerability: WS0-GETH00200: Serial numbers 2311**** and later.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "For the affected products, Mitsubishi Electric recommends users to take the following mitigation measures:",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "Set password for telnet sessions that are difficult for third parties to guess. The password can be up to 15 characters long. Note that \"[space]\" in the input string represents a single-byte space. Users can change the password for the telnet session of the affected product by using the telnet client and performing:",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "Password setting: (1) Enter \"telnet[space]\" followed by the IP address of the affected product and press the Enter key. (2) When \"Password\" is displayed, press the Enter key without entering anything. (3) When \"telnet\u003e\" is displayed, enter \"password[space]\" followed by the desired password string and press the Enter key. (4) Enter \"quit\" and press the Enter key.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "Confirm the password is set: (1) After the Password setting process, enter \"telnet[space]\" followed by the IP address of the affected product and press the Enter key. (2) When \"Password\" is displayed, enter the password string set in the Password setting process and press the Enter key. (3) If \"telnet\u003e\" is displayed, the password is set correctly. (4) Enter \"quit\" and press the Enter key.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "Alternatively, Mitsubishi Electric recommends that users take the following mitigation measures to minimize the risk of exploiting this vulnerability:",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "Use a firewall, virtual private network (VPN), etc. to prevent unauthorized access when Internet access is required.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "Use product within a local area network (LAN) and use firewalls to block access from untrusted networks and hosts.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "Restrict physical access to prevent untrusted devices from connecting to the LAN.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        },
        {
          "category": "mitigation",
          "details": "For more information, see Mitsubishi Electric\u0027s Security Advisory.",
          "product_ids": [
            "CSAFPID-0001"
          ],
          "url": "https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-002_en.pdf"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.0"
          },
          "products": [
            "CSAFPID-0001"
          ]
        }
      ]
    }
  ]
}