{
  "document": {
    "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 SIMATIC Process Historian (PH) fixes an authentication vulnerability in the configuration interface of redundant PH instances that could enable the execution of admin operations on the database.\n\nThe related vulnerable interface is restricted to local access on recent versions starting from SIMATIC Process Historian 2020.\n\nSiemens has released updates for several affected products and recommends to update to the latest versions. Siemens recommends specific countermeasures for products where updates are not, or not yet available.",
        "title": "Summary"
      },
      {
        "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\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",
        "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-766247: Authentication Vulnerability in SIMATIC Process Historian - PDF Version",
        "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-766247.pdf"
      },
      {
        "category": "self",
        "summary": "SSA-766247: Authentication Vulnerability in SIMATIC Process Historian - TXT Version",
        "url": "https://cert-portal.siemens.com/productcert/txt/ssa-766247.txt"
      },
      {
        "category": "self",
        "summary": "SSA-766247: Authentication Vulnerability in SIMATIC Process Historian - CSAF Version",
        "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-766247.json"
      }
    ],
    "title": "SSA-766247: Authentication Vulnerability in SIMATIC Process Historian",
    "tracking": {
      "current_release_date": "2022-01-11T00:00:00Z",
      "generator": {
        "engine": {
          "name": "Siemens ProductCERT CSAF Generator",
          "version": "1"
        }
      },
      "id": "SSA-766247",
      "initial_release_date": "2021-10-12T00:00:00Z",
      "revision_history": [
        {
          "date": "2021-10-12T00:00:00Z",
          "legacy_version": "1.0",
          "number": "1",
          "summary": "Publication Date"
        },
        {
          "date": "2022-01-11T00:00:00Z",
          "legacy_version": "1.1",
          "number": "2",
          "summary": "Added solution for SIMATIC Process Historian 2020"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:all/*",
                "product": {
                  "name": "SIMATIC Process Historian 2013 and earlier",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "SIMATIC Process Historian 2013 and earlier"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c SP3 Update 6",
                "product": {
                  "name": "SIMATIC Process Historian 2014",
                  "product_id": "2"
                }
              }
            ],
            "category": "product_name",
            "name": "SIMATIC Process Historian 2014"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:all/*",
                "product": {
                  "name": "SIMATIC Process Historian 2019",
                  "product_id": "3"
                }
              }
            ],
            "category": "product_name",
            "name": "SIMATIC Process Historian 2019"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:all/*",
                "product": {
                  "name": "SIMATIC Process Historian 2020",
                  "product_id": "4"
                }
              }
            ],
            "category": "product_name",
            "name": "SIMATIC Process Historian 2020"
          }
        ],
        "category": "vendor",
        "name": "Siemens"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-27395",
      "cwe": {
        "id": "CWE-306",
        "name": "Missing Authentication for Critical Function"
      },
      "notes": [
        {
          "category": "summary",
          "text": "An interface in the software that is used for critical functionalities lacks authentication, which could allow a malicious user to maliciously insert, modify or delete data.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "1",
          "2",
          "3",
          "4"
        ]
      },
      "references": [
        {
          "summary": "CVE-2021-27395 - SIMATIC Process Historian 2014",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109780528/"
        },
        {
          "summary": "CVE-2021-27395 Mitre 5.0 json",
          "url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2021-27395.json"
        }
      ],
      "remediations": [
        {
          "category": "mitigation",
          "details": "Consider upgrading to a newer SIMATIC Process Historian version",
          "product_ids": [
            "1",
            "3"
          ]
        },
        {
          "category": "no_fix_planned",
          "details": "Currently no remediation is planned",
          "product_ids": [
            "1",
            "3"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update to SP3 Update 6 or later version",
          "product_ids": [
            "2"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109780528/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to 2020 Update 2 or later version",
          "product_ids": [
            "4"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "To update, use the Process Historian version as bundled with PCS neo V3.1 Upd1 (https://support.industry.siemens.com/cs/ww/en/view/109804750/) or with PCS 7 V9.1 SP1 (https://support.industry.siemens.com/cs/ww/en/view/109805073/)",
          "product_ids": [
            "4"
          ]
        },
        {
          "category": "mitigation",
          "details": "Deactivate following incoming rules in the local Windows firewall:\n\n-   PH Redundancy Services\n-   PH Wcf MessageQueue Service (RedundancyMaintenanceService)\n-   PH Wcf MessageQueue Service (SqlMirroringSetup)\n-   PH Wcf MessageQueue Service (MaintenanceService)\n-   PH SQL-Server Mirroring Port (UDP)\n-   PH SQL-Server Mirroring Port (TCP)",
          "product_ids": [
            "1",
            "2",
            "3",
            "4"
          ]
        },
        {
          "category": "mitigation",
          "details": "In case SIMATIC Process Historian is used as a redundant system, restrict remote IP addresses in the firewall rules to allow only access for the Master, the Standby and the Mirror server",
          "product_ids": [
            "1",
            "2",
            "3",
            "4"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3",
            "4"
          ]
        }
      ],
      "title": "CVE-2021-27395"
    }
  ]
}