{
  "document": {
    "title": "SSA-594364: Denial-of-Service Vulnerability in SNMP Implementation of WinCC Runtime",
    "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-594364",
      "status": "final",
      "version": "1",
      "revision_history": [
        {
          "number": "1",
          "legacy_version": "1.0",
          "date": "2021-05-11T00:00:00Z",
          "summary": "Publication Date"
        }
      ],
      "initial_release_date": "2021-05-11T00:00:00Z",
      "current_release_date": "2021-05-11T00:00:00Z",
      "generator": {
        "engine": {
          "name": "Siemens ProductCERT CSAF Generator",
          "version": "1"
        }
      }
    },
    "notes": [
      {
        "title": "Summary",
        "category": "summary",
        "text": "A denial-of-service vulnerability in WinCC Runtime could allow an unauthenticated attacker with network access to cause a denial-of-service condition in the SNMP service by sending crafted SNMP packets to port 161/udp.\n\nSiemens has released updates for the affected products and recommends to update to the latest versions."
      },
      {
        "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-594364.pdf",
        "summary": "SSA-594364: Denial-of-Service Vulnerability in SNMP Implementation of WinCC Runtime - PDF Version"
      },
      {
        "category": "self",
        "url": "https://cert-portal.siemens.com/productcert/txt/ssa-594364.txt",
        "summary": "SSA-594364: Denial-of-Service Vulnerability in SNMP Implementation of WinCC Runtime - TXT Version"
      },
      {
        "category": "self",
        "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-594364.json",
        "summary": "SSA-594364: Denial-of-Service Vulnerability in SNMP Implementation of WinCC Runtime - CSAF Version"
      }
    ],
    "acknowledgments": [
      {
        "names": [
          "Younes Dragoni",
          "Alessandro Di Pinto"
        ],
        "organization": "Nozomi Networks",
        "summary": "coordinated disclosure"
      }
    ]
  },
  "product_tree": {
    "branches": [
      {
        "name": "Siemens",
        "category": "vendor",
        "branches": [
          {
            "name": "SIMATIC HMI Comfort Panels 1st Generation (incl. SIPLUS variants)",
            "category": "product_name",
            "branches": [
              {
                "name": "< V16 Update 4",
                "category": "product_version_range",
                "product": {
                  "product_id": "1",
                  "name": "SIMATIC HMI Comfort Panels 1st Generation (incl. SIPLUS variants)"
                }
              }
            ]
          },
          {
            "name": "SIMATIC HMI KTP Mobile Panels",
            "category": "product_name",
            "branches": [
              {
                "name": "< V16 Update 4",
                "category": "product_version_range",
                "product": {
                  "product_id": "2",
                  "name": "SIMATIC HMI KTP Mobile Panels"
                }
              }
            ]
          }
        ]
      }
    ]
  },
  "vulnerabilities": [
    {
      "title": "CVE-2019-19276",
      "notes": [
        {
          "title": "Summary",
          "category": "summary",
          "text": "Specially crafted packets sent to port 161/udp can cause the SNMP service of affected devices to crash. A manual restart of the device is required to resume operation of the service."
        }
      ],
      "cve": "CVE-2019-19276",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "product_status": {
        "known_affected": [
          "1",
          "2"
        ]
      },
      "scores": [
        {
          "cvss_v3": {
            "version": "3.1",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C"
          },
          "products": [
            "1",
            "2"
          ]
        }
      ],
      "remediations": [
        {
          "product_ids": [
            "1",
            "2"
          ],
          "category": "vendor_fix",
          "details": "Update to V16 Update 4 or later version",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109775861/"
        },
        {
          "product_ids": [
            "1",
            "2"
          ],
          "category": "mitigation",
          "details": "Disable SNMP if this is supported by the product. Disabling SNMP fully mitigates the vulnerability"
        },
        {
          "product_ids": [
            "1",
            "2"
          ],
          "category": "mitigation",
          "details": "Restrict network access to port 161/udp of affected devices to trusted devices or IP addresses"
        }
      ],
      "references": [
        {
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109775861/",
          "summary": "CVE-2019-19276 - SIMATIC HMI Comfort Panels 1st Generation (incl. SIPLUS variants)"
        },
        {
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109775861/",
          "summary": "CVE-2019-19276 - SIMATIC HMI KTP Mobile Panels"
        },
        {
          "url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2019-19276.json",
          "summary": "CVE-2019-19276 Mitre 5.0 json"
        }
      ]
    }
  ]
}