{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "Daniel dos Santos"
        ],
        "organization": "Forescout Technologies Inc.",
        "summary": "coordinated disclosure"
      }
    ],
    "category": "Siemens Security Advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Disclosure is not limited.",
      "tlp": {
        "label": "WHITE"
      }
    },
    "notes": [
      {
        "category": "summary",
        "text": "Security researchers discovered and disclosed 9 vulnerabilities in several DNS implementations, also known as \u201cNAME:WRECK\u201d vulnerabilities. The vulnerabilities described in this advisory are from this set.\n\nThe DNS client of the networking component (Nucleus NET) in Nucleus Real-Time Operating System (RTOS) contains two out of bounds write vulnerabilities in the handling of DNS responses that could allow an attacker to cause a denial-of-service condition or to remotely execute code.\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 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-185699: Out of Bounds Write Vulnerabilities (NAME:WRECK) in the DNS Module of Nucleus RTOS - PDF Version",
        "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-185699.pdf"
      },
      {
        "category": "self",
        "summary": "SSA-185699: Out of Bounds Write Vulnerabilities (NAME:WRECK) in the DNS Module of Nucleus RTOS - TXT Version",
        "url": "https://cert-portal.siemens.com/productcert/txt/ssa-185699.txt"
      },
      {
        "category": "self",
        "summary": "SSA-185699: Out of Bounds Write Vulnerabilities (NAME:WRECK) in the DNS Module of Nucleus RTOS - CSAF Version",
        "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-185699.json"
      }
    ],
    "title": "SSA-185699: Out of Bounds Write Vulnerabilities (NAME:WRECK) in the DNS Module of Nucleus RTOS",
    "tracking": {
      "current_release_date": "2022-01-11T00:00:00Z",
      "generator": {
        "engine": {
          "name": "Siemens ProductCERT CSAF Generator",
          "version": "1"
        }
      },
      "id": "SSA-185699",
      "initial_release_date": "2021-04-13T00:00:00Z",
      "revision_history": [
        {
          "date": "2021-04-13T00:00:00Z",
          "legacy_version": "1.0",
          "number": "1",
          "summary": "Publication Date"
        },
        {
          "date": "2021-11-09T00:00:00Z",
          "legacy_version": "1.1",
          "number": "2",
          "summary": "Consolidated list of products"
        },
        {
          "date": "2022-01-11T00:00:00Z",
          "legacy_version": "1.2",
          "number": "3",
          "summary": "Removed CAPITAL VSTAR as not affected"
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V5.2",
                "product": {
                  "name": "Nucleus NET",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "Nucleus NET"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "Versions including affected DNS modules",
                "product": {
                  "name": "Nucleus Source Code",
                  "product_id": "2"
                }
              }
            ],
            "category": "product_name",
            "name": "Nucleus Source Code"
          }
        ],
        "category": "vendor",
        "name": "Siemens"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2020-15795",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "notes": [
        {
          "category": "summary",
          "text": "The DNS domain name label parsing functionality does not properly validate the names in DNS-responses. The parsing of malformed responses could result in a write past the end of an allocated structure. An attacker with a privileged position in the network could leverage this vulnerability to execute code in the context of the current process or cause a denial-of-service condition.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "1",
          "2"
        ]
      },
      "references": [
        {
          "summary": "CVE-2020-15795 Mitre 5.0 json",
          "url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2020-15795.json"
        }
      ],
      "remediations": [
        {
          "category": "mitigation",
          "details": "Update to the latest version of Nucleus ReadyStart V3 or V4",
          "product_ids": [
            "1"
          ]
        },
        {
          "category": "mitigation",
          "details": "Note that the latest version of Nucleus NET (V5.2) is not affected, but is already beyond end of software support",
          "product_ids": [
            "1"
          ]
        },
        {
          "category": "mitigation",
          "details": "Contact customer support or your local Nucleus Sales team for mitigation advice",
          "product_ids": [
            "1"
          ]
        },
        {
          "category": "no_fix_planned",
          "details": "Currently no remediation is planned",
          "product_ids": [
            "1"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Contact customer support to receive patch and update information",
          "product_ids": [
            "2"
          ]
        },
        {
          "category": "workaround",
          "details": "Avoid using DNS client of affected versions",
          "product_ids": [
            "1",
            "2"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2"
          ]
        }
      ],
      "title": "CVE-2020-15795"
    },
    {
      "cve": "CVE-2020-27009",
      "cwe": {
        "id": "CWE-823",
        "name": "Use of Out-of-range Pointer Offset"
      },
      "notes": [
        {
          "category": "summary",
          "text": "The DNS domain name record decompression functionality does not properly validate the pointer offset values. The parsing of malformed responses could result in a write past the end of an allocated structure. An attacker with a privileged position in the network could leverage this vulnerability to execute code in the context of the current process or cause a denial-of-service condition.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "1",
          "2"
        ]
      },
      "references": [
        {
          "summary": "CVE-2020-27009 Mitre 5.0 json",
          "url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2020-27009.json"
        }
      ],
      "remediations": [
        {
          "category": "mitigation",
          "details": "Update to the latest version of Nucleus ReadyStart V3 or V4",
          "product_ids": [
            "1"
          ]
        },
        {
          "category": "mitigation",
          "details": "Note that the latest version of Nucleus NET (V5.2) is not affected, but is already beyond end of software support",
          "product_ids": [
            "1"
          ]
        },
        {
          "category": "mitigation",
          "details": "Contact customer support or your local Nucleus Sales team for mitigation advice",
          "product_ids": [
            "1"
          ]
        },
        {
          "category": "no_fix_planned",
          "details": "Currently no remediation is planned",
          "product_ids": [
            "1"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Contact customer support to receive patch and update information",
          "product_ids": [
            "2"
          ]
        },
        {
          "category": "workaround",
          "details": "Avoid using DNS client of affected versions",
          "product_ids": [
            "1",
            "2"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2"
          ]
        }
      ],
      "title": "CVE-2020-27009"
    }
  ]
}