{
  "document": {
    "acknowledgments": [
      {
        "organization": "Siemens",
        "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": "general",
        "text": "This CSAF advisory was extracted from unstructured data and may contain inaccuracies. If you notice any errors, please reach out to the designated contact at CISA CSAF: central@cisa.dhs.gov",
        "title": "CISA Disclaimer"
      },
      {
        "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 with network access to the LAN interface of an affected device to hijack an ongoing connection or spoof a new one.",
        "title": "Risk evaluation"
      },
      {
        "category": "other",
        "text": "Energy",
        "title": "Critical infrastructure sectors"
      },
      {
        "category": "other",
        "text": "Worldwide",
        "title": "Countries/areas deployed"
      },
      {
        "category": "other",
        "text": "Germany",
        "title": "Company headquarters location"
      },
      {
        "category": "general",
        "text": "CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.\nCISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "Additional mitigation guidance and recommended practices are publicly available on the ICS webpage on cisa.gov in the Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.\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.",
        "title": "Recommended Practices"
      },
      {
        "category": "general",
        "text": "For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories",
        "title": "Additional Resources"
      },
      {
        "category": "other",
        "text": "No known public exploits specifically target this vulnerability. This vulnerability is not exploitable remotely.",
        "title": "Exploitability"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "Email: CISAservicedesk@cisa.dhs.gov;\n Toll Free: 1-888-282-0870",
      "name": "CISA",
      "namespace": "https://www.cisa.gov/"
    },
    "references": [
      {
        "category": "external",
        "summary": "SSA-316383: NumberJack Vulnerability in LOGO! CMR and SIMATIC RTU 3000 devices - CSAF Version",
        "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-316383.json"
      },
      {
        "category": "self",
        "summary": "ICS Advisory ICSA-21-257-13 JSON",
        "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2021/icsa-21-257-13.json"
      },
      {
        "category": "self",
        "summary": "ICS Advisory ICSA-21-257-13 Web Version",
        "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-21-257-13"
      },
      {
        "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://www.cisa.gov/uscert/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"
      },
      {
        "category": "external",
        "summary": "SSA-316383: NumberJack Vulnerability in LOGO! CMR and SIMATIC RTU 3000 devices - PDF Version",
        "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-316383.pdf"
      },
      {
        "category": "external",
        "summary": "SSA-316383: NumberJack Vulnerability in LOGO! CMR and SIMATIC RTU 3000 devices - TXT Version",
        "url": "https://cert-portal.siemens.com/productcert/txt/ssa-316383.txt"
      }
    ],
    "title": "Siemens LOGO! CMR and SIMATIC RTU 3000 (Update A)",
    "tracking": {
      "current_release_date": "2022-02-10T00:00:00.000000Z",
      "generator": {
        "engine": {
          "name": "CISA CSAF Generator",
          "version": "1.0.0"
        }
      },
      "id": "ICSA-21-257-13",
      "initial_release_date": "2021-09-14T00:00:00.000000Z",
      "revision_history": [
        {
          "date": "2021-09-14T00:00:00.000000Z",
          "legacy_version": "Initial",
          "number": "1",
          "summary": "ICSA-21-257-13 Siemens LOGO! CMR and SIMATIC RTU 3000"
        },
        {
          "date": "2022-02-10T00:00:00.000000Z",
          "legacy_version": "A",
          "number": "2",
          "summary": "ICSA-21-257-13 Siemens LOGO CMR and SIMATIC RTU 3000 (Update A)"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V2.2",
                "product": {
                  "name": "LOGO! CMR2020 (6GK7142-7BX00-0AX0)",
                  "product_id": "CSAFPID-0001",
                  "product_identification_helper": {
                    "model_numbers": [
                      "6GK7142-7BX00-0AX0"
                    ]
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "LOGO! CMR2020"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V2.2",
                "product": {
                  "name": "LOGO! CMR2040 (6GK7142-7EX00-0AX0)",
                  "product_id": "CSAFPID-0002",
                  "product_identification_helper": {
                    "model_numbers": [
                      "6GK7142-7EX00-0AX0"
                    ]
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "LOGO! CMR2040"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V4.0.9",
                "product": {
                  "name": "SIMATIC RTU3010C (6NH3112-0BA00-0XX0)",
                  "product_id": "CSAFPID-0003",
                  "product_identification_helper": {
                    "model_numbers": [
                      "6NH3112-0BA00-0XX0"
                    ]
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "SIMATIC RTU3010C"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V4.0.9",
                "product": {
                  "name": "SIMATIC RTU3030C (6NH3112-3BA00-0XX0)",
                  "product_id": "CSAFPID-0004",
                  "product_identification_helper": {
                    "model_numbers": [
                      "6NH3112-3BA00-0XX0"
                    ]
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "SIMATIC RTU3030C"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V4.0.9",
                "product": {
                  "name": "SIMATIC RTU3031C (6NH3112-3BB00-0XX0)",
                  "product_id": "CSAFPID-0005",
                  "product_identification_helper": {
                    "model_numbers": [
                      "6NH3112-3BB00-0XX0"
                    ]
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "SIMATIC RTU3031C"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V4.0.9",
                "product": {
                  "name": "SIMATIC RTU3041C (6NH3112-4BB00-0XX0)",
                  "product_id": "CSAFPID-0006",
                  "product_identification_helper": {
                    "model_numbers": [
                      "6NH3112-4BB00-0XX0"
                    ]
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "SIMATIC RTU3041C"
          }
        ],
        "category": "vendor",
        "name": "Siemens"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-37186",
      "cwe": {
        "id": "CWE-330",
        "name": "Use of Insufficiently Random Values"
      },
      "notes": [
        {
          "category": "summary",
          "text": "The underlying TCP/IP stack does not properly calculate the random numbers used as ISN (Initial Sequence Numbers). An adjacent attacker with network access to the LAN interface could interfere with traffic, spoof the connection and gain access to sensitive information.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-0001",
          "CSAFPID-0002",
          "CSAFPID-0003",
          "CSAFPID-0004",
          "CSAFPID-0005",
          "CSAFPID-0006"
        ]
      },
      "references": [
        {
          "summary": "CVE-2021-37186 - LOGO! CMR2020",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109800267/"
        },
        {
          "summary": "CVE-2021-37186 - LOGO! CMR2040",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109800267/"
        },
        {
          "summary": "CVE-2021-37186 - SIMATIC RTU3010C",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109802779/"
        },
        {
          "summary": "CVE-2021-37186 - SIMATIC RTU3030C",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109802779/"
        },
        {
          "summary": "CVE-2021-37186 - SIMATIC RTU3031C",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109802779/"
        },
        {
          "summary": "CVE-2021-37186 - SIMATIC RTU3041C",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109802779/"
        },
        {
          "summary": "CVE-2021-37186 Mitre 5.0 json",
          "url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2021-37186.json"
        },
        {
          "category": "external",
          "summary": "web.nvd.nist.gov",
          "url": "http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-37186"
        },
        {
          "category": "external",
          "summary": "www.first.org",
          "url": "https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Update to V2.2 or later version",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109800267/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to V4.0.9 or later version",
          "product_ids": [
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109802779/"
        },
        {
          "category": "mitigation",
          "details": "As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens\u0027 operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals.\n\nAdditional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity",
          "product_ids": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0001",
            "CSAFPID-0002",
            "CSAFPID-0003",
            "CSAFPID-0004",
            "CSAFPID-0005",
            "CSAFPID-0006"
          ]
        }
      ],
      "title": "CVE-2021-37186"
    }
  ]
}