{
  "document": {
    "category": "Siemens Security Advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Disclosure is not limited.",
      "tlp": {
        "label": "WHITE"
      }
    },
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability was identified in the Automation License Manager software that could be triggered by sending specially crafted packets to port 4410/tcp of an affected system. This could cause a denial-of-service preventing legitimate users from using the system.\n\nSiemens has released an update for the Automation License Manager 6 and recommends to update to the latest version. 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-158827: Denial-of-Service Vulnerability in Automation License Manager - PDF Version",
        "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-158827.pdf"
      },
      {
        "category": "self",
        "summary": "SSA-158827: Denial-of-Service Vulnerability in Automation License Manager - TXT Version",
        "url": "https://cert-portal.siemens.com/productcert/txt/ssa-158827.txt"
      },
      {
        "category": "self",
        "summary": "SSA-158827: Denial-of-Service Vulnerability in Automation License Manager - CSAF Version",
        "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-158827.json"
      }
    ],
    "title": "SSA-158827: Denial-of-Service Vulnerability in Automation License Manager",
    "tracking": {
      "current_release_date": "2021-08-10T00:00:00Z",
      "generator": {
        "engine": {
          "name": "Siemens ProductCERT CSAF Generator",
          "version": "1"
        }
      },
      "id": "SSA-158827",
      "initial_release_date": "2021-08-10T00:00:00Z",
      "revision_history": [
        {
          "date": "2021-08-10T00:00:00Z",
          "legacy_version": "1.0",
          "number": "1",
          "summary": "Publication Date"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:all/*",
                "product": {
                  "name": "Automation License Manager 5",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "Automation License Manager 5"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V6.0 SP9 Update 2",
                "product": {
                  "name": "Automation License Manager 6",
                  "product_id": "2"
                }
              }
            ],
            "category": "product_name",
            "name": "Automation License Manager 6"
          }
        ],
        "category": "vendor",
        "name": "Siemens"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-25659",
      "cwe": {
        "id": "CWE-400",
        "name": "Uncontrolled Resource Consumption"
      },
      "notes": [
        {
          "category": "summary",
          "text": "Sending specially crafted packets to port 4410/tcp of an affected system could lead to extensive memory being consumed and as such could cause a denial-of-service preventing legitimate users from using the system.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "1",
          "2"
        ]
      },
      "references": [
        {
          "summary": "CVE-2021-25659 - Automation License Manager 6",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/114358/"
        },
        {
          "summary": "CVE-2021-25659 Mitre 5.0 json",
          "url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2021-25659.json"
        }
      ],
      "remediations": [
        {
          "category": "none_available",
          "details": "Currently no remediation is available",
          "product_ids": [
            "1"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update to V6.0 SP9 Update 2 or later",
          "product_ids": [
            "2"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/114358/"
        },
        {
          "category": "mitigation",
          "details": "On the Automation License Manager settings menu disable \"Allow Remote Connections\"",
          "product_ids": [
            "1",
            "2"
          ]
        },
        {
          "category": "mitigation",
          "details": "If remote connections are needed, limit remote access to port 4410/tcp to trusted systems only",
          "product_ids": [
            "1",
            "2"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2"
          ]
        }
      ],
      "title": "CVE-2021-25659"
    }
  ]
}