{
  "document": {
    "title": "SSA-296266: Denial-of-Service Vulnerability in SCALANCE and RUGGEDCOM Devices",
    "category": "Siemens Security Advisory",
    "csaf_version": "2.0",
    "publisher": {
      "name": "Siemens ProductCERT",
      "contact_details": "productcert@siemens.com",
      "category": "vendor",
      "namespace": "https://www.siemens.com"
    },
    "distribution": {
      "text": "Disclosure is not limited.",
      "tlp": {
        "label": "WHITE"
      }
    },
    "tracking": {
      "id": "SSA-296266",
      "status": "final",
      "version": "2",
      "revision_history": [
        {
          "number": "1",
          "legacy_version": "1.0",
          "date": "2021-03-09T00:00:00Z",
          "summary": "Publication Date"
        },
        {
          "number": "2",
          "legacy_version": "1.1",
          "date": "2021-04-13T00:00:00Z",
          "summary": "Added solution for SCALANCE M-800/S615 and RUGGEDCOM RM1224"
        }
      ],
      "initial_release_date": "2021-03-09T00:00:00Z",
      "current_release_date": "2021-04-13T00:00:00Z",
      "generator": {
        "engine": {
          "name": "Siemens ProductCERT CSAF Generator",
          "version": "1"
        }
      }
    },
    "notes": [
      {
        "title": "Summary",
        "category": "summary",
        "text": "Some firmware versions of the SCALANCE and RUGGEDCOM devices listed below are affected by a vulnerability in the SSH authentication that could allow an attacker to cause a Denial-of-Service under certain conditions.\n\nSiemens has released updates for the affected products and recommends to update to the latest version."
      },
      {
        "title": "General Recommendations",
        "category": "general",
        "text": "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' 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"
      },
      {
        "title": "Additional Resources",
        "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": "Terms of Use",
        "category": "legal_disclaimer",
        "text": "Siemens Security Advisories are subject to the terms and conditions contained in Siemens' 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' 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."
      }
    ],
    "references": [
      {
        "category": "self",
        "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-296266.pdf",
        "summary": "SSA-296266: Denial-of-Service Vulnerability in SCALANCE and RUGGEDCOM Devices - PDF Version"
      },
      {
        "category": "self",
        "url": "https://cert-portal.siemens.com/productcert/txt/ssa-296266.txt",
        "summary": "SSA-296266: Denial-of-Service Vulnerability in SCALANCE and RUGGEDCOM Devices - TXT Version"
      },
      {
        "category": "self",
        "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-296266.json",
        "summary": "SSA-296266: Denial-of-Service Vulnerability in SCALANCE and RUGGEDCOM Devices - CSAF Version"
      }
    ]
  },
  "product_tree": {
    "branches": [
      {
        "name": "Siemens",
        "category": "vendor",
        "branches": [
          {
            "name": "RUGGEDCOM RM1224",
            "category": "product_name",
            "branches": [
              {
                "name": "V6.3",
                "category": "product_version_range",
                "product": {
                  "product_id": "1",
                  "name": "RUGGEDCOM RM1224"
                }
              }
            ]
          },
          {
            "name": "SCALANCE M-800",
            "category": "product_name",
            "branches": [
              {
                "name": "V6.3",
                "category": "product_version_range",
                "product": {
                  "product_id": "2",
                  "name": "SCALANCE M-800"
                }
              }
            ]
          },
          {
            "name": "SCALANCE S615",
            "category": "product_name",
            "branches": [
              {
                "name": "V6.3",
                "category": "product_version_range",
                "product": {
                  "product_id": "3",
                  "name": "SCALANCE S615"
                }
              }
            ]
          },
          {
            "name": "SCALANCE SC-600",
            "category": "product_name",
            "branches": [
              {
                "name": "All Versions >= V2.1 and < V2.1.3",
                "category": "product_version_range",
                "product": {
                  "product_id": "4",
                  "name": "SCALANCE SC-600"
                }
              }
            ]
          }
        ]
      }
    ]
  },
  "vulnerabilities": [
    {
      "title": "CVE-2021-25676",
      "notes": [
        {
          "title": "Summary",
          "category": "summary",
          "text": "Multiple failed SSH authentication attempts could trigger a temporary Denial-of-Service under certain conditions. When triggered, the device will reboot automatically."
        }
      ],
      "cve": "CVE-2021-25676",
      "cwe": {
        "id": "CWE-307",
        "name": "Improper Restriction of Excessive Authentication Attempts"
      },
      "product_status": {
        "known_affected": [
          "1",
          "2",
          "3",
          "4"
        ]
      },
      "scores": [
        {
          "cvss_v3": {
            "version": "3.1",
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C"
          },
          "products": [
            "1",
            "2",
            "3",
            "4"
          ]
        }
      ],
      "remediations": [
        {
          "product_ids": [
            "1",
            "2",
            "3"
          ],
          "category": "vendor_fix",
          "details": "Update to V6.4 or later version",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109794349/"
        },
        {
          "product_ids": [
            "4"
          ],
          "category": "vendor_fix",
          "details": "Update to V2.1.3 or later version",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109793041/"
        },
        {
          "product_ids": [
            "1",
            "2",
            "3",
            "4"
          ],
          "category": "mitigation",
          "details": "Configure the built-in firewall to only allow SSH incoming connections from trusted IP addresses"
        }
      ],
      "references": [
        {
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109794349/",
          "summary": "CVE-2021-25676 - RUGGEDCOM RM1224"
        },
        {
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109794349/",
          "summary": "CVE-2021-25676 - SCALANCE M-800"
        },
        {
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109794349/",
          "summary": "CVE-2021-25676 - SCALANCE S615"
        },
        {
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109793041/",
          "summary": "CVE-2021-25676 - SCALANCE SC-600"
        },
        {
          "url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2021-25676.json",
          "summary": "CVE-2021-25676 Mitre 5.0 json"
        }
      ]
    }
  ]
}