{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "Yuriy Strela"
        ],
        "organization": "GAI NetConsult GmbH",
        "summary": "coordinated disclosure"
      }
    ],
    "category": "Siemens Security Advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Disclosure is not limited.",
      "tlp": {
        "label": "WHITE"
      }
    },
    "notes": [
      {
        "category": "summary",
        "text": "The latest update for SIPROTEC 5 family devices fixes a vulnerability in the web interface which could allow unauthorized users to cause a Denial-of-Service situation by sending maliciously crafted web requests.\n\nSiemens has released an update for the SIPROTEC 5 and recommends to update to the latest version.",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "Operators of critical power systems (e.g. TSOs or DSOs) worldwide are usually required by regulations to build resilience into the power grids by applying multi-level redundant secondary protection schemes. It is therefore recommended that the operators check whether appropriate resilient protection measures are in place. The risk of cyber incidents impacting the grid\u0027s reliability can thus be minimized by virtue of the grid design.\n\nSiemens strongly recommends applying the provided security updates using the corresponding tooling and documented procedures made available with the product. If supported by the product, an automated means to apply the security updates across multiple product instances may be used. Siemens strongly recommends prior validation of any security update before being applied, and supervision by trained staff of the update process in the target environment.\n\nAs a general security measure Siemens strongly recommends to protect network access with appropriate mechanisms (e.g. firewalls, segmentation, VPN). It is advised to configure the environment according to our operational guidelines in order to run the devices in a protected IT environment.\n\nRecommended security guidelines can be found at:\n\nhttps://www.siemens.com/gridsecurity",
        "title": "General Recommendations"
      },
      {
        "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": "legal_disclaimer",
        "text": "Siemens Security Advisories are subject to the terms and conditions contained in Siemens\u0027 underlying license terms or other applicable agreements previously agreed to with Siemens (hereinafter \"License Terms\"). To the extent applicable to information, software or documentation made available in or through a Siemens Security Advisory, the Terms of Use of Siemens\u0027 Global Website (https://www.siemens.com/terms_of_use, hereinafter \"Terms of Use\"), in particular Sections 8-10 of the Terms of Use, shall apply additionally. In case of conflicts, the License Terms shall prevail over the Terms of Use.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "productcert@siemens.com",
      "name": "Siemens ProductCERT",
      "namespace": "https://www.siemens.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "SSA-500748: Denial-of-Service Vulnerabilities in SIPROTEC 5 Devices - PDF Version",
        "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-500748.pdf"
      },
      {
        "category": "self",
        "summary": "SSA-500748: Denial-of-Service Vulnerabilities in SIPROTEC 5 Devices - TXT Version",
        "url": "https://cert-portal.siemens.com/productcert/txt/ssa-500748.txt"
      },
      {
        "category": "self",
        "summary": "SSA-500748: Denial-of-Service Vulnerabilities in SIPROTEC 5 Devices - CSAF Version",
        "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-500748.json"
      }
    ],
    "title": "SSA-500748: Denial-of-Service Vulnerabilities in SIPROTEC 5 Devices",
    "tracking": {
      "current_release_date": "2021-10-12T00:00:00Z",
      "generator": {
        "engine": {
          "name": "Siemens ProductCERT CSAF Generator",
          "version": "1"
        }
      },
      "id": "SSA-500748",
      "initial_release_date": "2021-09-14T00:00:00Z",
      "revision_history": [
        {
          "date": "2021-09-14T00:00:00Z",
          "legacy_version": "1.0",
          "number": "1",
          "summary": "Publication Date"
        },
        {
          "date": "2021-10-12T00:00:00Z",
          "legacy_version": "1.1",
          "number": "2",
          "summary": "Removed CP200 from list of affected products"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V8.80",
                "product": {
                  "name": "SIPROTEC 5 relays with CPU variants CP050",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "SIPROTEC 5 relays with CPU variants CP050"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V8.80",
                "product": {
                  "name": "SIPROTEC 5 relays with CPU variants CP100",
                  "product_id": "2"
                }
              }
            ],
            "category": "product_name",
            "name": "SIPROTEC 5 relays with CPU variants CP100"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V8.80",
                "product": {
                  "name": "SIPROTEC 5 relays with CPU variants CP300",
                  "product_id": "3"
                }
              }
            ],
            "category": "product_name",
            "name": "SIPROTEC 5 relays with CPU variants CP300"
          }
        ],
        "category": "vendor",
        "name": "Siemens"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-37206",
      "cwe": {
        "id": "CWE-20",
        "name": "Improper Input Validation"
      },
      "notes": [
        {
          "category": "summary",
          "text": "Received webpackets are not properly processed. An unauthenticated remote attacker with access to any of the Ethernet interfaces could send specially crafted packets to force a restart of the target device.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "1",
          "2",
          "3"
        ]
      },
      "references": [
        {
          "summary": "CVE-2021-37206 - SIPROTEC 5 relays with CPU variants CP050",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109740816/"
        },
        {
          "summary": "CVE-2021-37206 - SIPROTEC 5 relays with CPU variants CP100",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109740816/"
        },
        {
          "summary": "CVE-2021-37206 - SIPROTEC 5 relays with CPU variants CP300",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109740816/"
        },
        {
          "summary": "CVE-2021-37206 Mitre 5.0 json",
          "url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2021-37206.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Update to V8.80 or later version",
          "product_ids": [
            "1",
            "2",
            "3"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109740816/"
        },
        {
          "category": "mitigation",
          "details": "Block access to port 4443/tcp e.g. with an external firewall",
          "product_ids": [
            "1",
            "2",
            "3"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:F/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3"
          ]
        }
      ],
      "title": "CVE-2021-37206"
    }
  ]
}