{
  "document": {
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Disclosure is not limited.",
      "tlp": {
        "label": "WHITE"
      }
    },
    "notes": [
      {
        "category": "summary",
        "text": "A security research [1] identified weaknesses in the IEEE 1735 recommended practice for encryption of Design IP, which could allow a sophisticated attacker access to unencrypted Design IP data in IEEE 1735-compliant products. This advisory addresses the specific details for the affected Siemens software products: Questa and ModelSim simulators.\n\nSiemens is preparing updates and recommends specific countermeasures for Questa and ModelSim.\n\n[1] \nhttps://arxiv.org/abs/2112.04838",
        "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: \nhttps://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals.\nAdditional information on Industrial Security by Siemens can be found at: \nhttps://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-400332: Insufficient Design IP Protection in IEEE 1735 Recommended Practice - Impact to Questa and ModelSim - PDF Version",
        "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-400332.pdf"
      },
      {
        "category": "self",
        "summary": "SSA-400332: Insufficient Design IP Protection in IEEE 1735 Recommended Practice - Impact to Questa and ModelSim - TXT Version",
        "url": "https://cert-portal.siemens.com/productcert/txt/ssa-400332.txt"
      },
      {
        "category": "self",
        "summary": "SSA-400332: Insufficient Design IP Protection in IEEE 1735 Recommended Practice - Impact to Questa and ModelSim - CSAF Version",
        "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-400332.json"
      }
    ],
    "title": "SSA-400332: Insufficient Design IP Protection in IEEE 1735 Recommended Practice - Impact to Questa and ModelSim",
    "tracking": {
      "current_release_date": "2022-11-08T00:00:00Z",
      "generator": {
        "engine": {
          "name": "Siemens ProductCERT CSAF Generator",
          "version": "1"
        }
      },
      "id": "SSA-400332",
      "initial_release_date": "2021-12-14T00:00:00Z",
      "revision_history": [
        {
          "date": "2021-12-14T00:00:00Z",
          "legacy_version": "1.0",
          "number": "1",
          "summary": "Publication Date"
        },
        {
          "date": "2022-11-08T00:00:00Z",
          "legacy_version": "1.1",
          "number": "2",
          "summary": "Added significant changes implemented in latest product version 2022.4"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:all/*",
                "product": {
                  "name": "ModelSim Simulation",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "ModelSim Simulation"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:all/*",
                "product": {
                  "name": "Questa Simulation",
                  "product_id": "2"
                }
              }
            ],
            "category": "product_name",
            "name": "Questa Simulation"
          }
        ],
        "category": "vendor",
        "name": "Siemens"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-42023",
      "cwe": {
        "id": "CWE-522",
        "name": "Insufficiently Protected Credentials"
      },
      "notes": [
        {
          "category": "summary",
          "text": "The RSA white-box implementation in affected applications insufficiently protects the built-in private keys that are required to decrypt electronic intellectual property (IP) data in accordance with the IEEE 1735 recommended practice.\n\nThis could allow a sophisticated attacker to discover the keys, bypassing the protection intended by the IEEE 1735 recommended practice.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "1",
          "2"
        ]
      },
      "remediations": [
        {
          "category": "mitigation",
          "details": "Company-internal use of encrypted design IP data: Apply technical and procedural measures to ensure that access to the data is granted on a need-to-know basis.",
          "product_ids": [
            "1",
            "2"
          ]
        },
        {
          "category": "mitigation",
          "details": "Companies that deliver encrypted design IP data to their customers: ensure that procedural and contractual measures are in place that minimize the risk of unauthorized access to the data.",
          "product_ids": [
            "1",
            "2"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update to new releases as they become available (see also section Additional Information)",
          "product_ids": [
            "1"
          ],
          "url": "https://support.sw.siemens.com/en-US/product/852852093/"
        },
        {
          "category": "vendor_fix",
          "details": "Update to new releases as they become available (see also section Additional Information)",
          "product_ids": [
            "2"
          ],
          "url": "https://support.sw.siemens.com/en-US/product/852852103/"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.0,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N/E:P/RL:U/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2"
          ]
        }
      ],
      "title": "CVE-2021-42023"
    }
  ]
}