{
  "document": {
    "title": "SSA-847986: Denial-of-Service Vulnerabilities in SIPROTEC 5 relays",
    "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-847986",
      "status": "final",
      "version": "2",
      "revision_history": [
        {
          "number": "1",
          "legacy_version": "1.0",
          "date": "2021-09-14T00:00:00Z",
          "summary": "Publication Date"
        },
        {
          "number": "2",
          "legacy_version": "1.1",
          "date": "2021-10-12T00:00:00Z",
          "summary": "Removed CP200 from list of affected products"
        }
      ],
      "initial_release_date": "2021-09-14T00:00:00Z",
      "current_release_date": "2021-10-12T00:00:00Z",
      "generator": {
        "engine": {
          "name": "Siemens ProductCERT CSAF Generator",
          "version": "1"
        }
      }
    },
    "notes": [
      {
        "title": "Summary",
        "category": "summary",
        "text": "The latest update for SIPROTEC 5 relays fixes two vulnerabilities that could allow a remote attacker to cause a denial-of-service or potentially trigger a remote code execution under certain circumstances.\n\nSiemens has released an update for SIPROTEC 5 relays and recommends to update to the latest version."
      },
      {
        "title": "General Recommendations",
        "category": "general",
        "text": "Operators of critical power systems (e.g. TSOs or DSOs) worldwide are usually required by regulations to build resilience into the power grids by applying multi-level redundant secondary protection schemes. It is therefore recommended that the operators check whether appropriate resilient protection measures are in place. The risk of cyber incidents impacting the grid's reliability can thus be minimized by virtue of the grid design.\n\nSiemens strongly recommends applying the provided security updates using the corresponding tooling and documented procedures made available with the product. If supported by the product, an automated means to apply the security updates across multiple product instances may be used. Siemens strongly recommends prior validation of any security update before being applied, and supervision by trained staff of the update process in the target environment.\n\nAs a general security measure Siemens strongly recommends to protect network access with appropriate mechanisms (e.g. firewalls, segmentation, VPN). It is advised to configure the environment according to our operational guidelines in order to run the devices in a protected IT environment.\n\nRecommended security guidelines can be found at:\n\nhttps://www.siemens.com/gridsecurity"
      },
      {
        "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-847986.pdf",
        "summary": "SSA-847986: Denial-of-Service Vulnerabilities in SIPROTEC 5 relays - PDF Version"
      },
      {
        "category": "self",
        "url": "https://cert-portal.siemens.com/productcert/txt/ssa-847986.txt",
        "summary": "SSA-847986: Denial-of-Service Vulnerabilities in SIPROTEC 5 relays - TXT Version"
      },
      {
        "category": "self",
        "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-847986.json",
        "summary": "SSA-847986: Denial-of-Service Vulnerabilities in SIPROTEC 5 relays - CSAF Version"
      }
    ],
    "acknowledgments": [
      {
        "names": [
          "Michael Messner"
        ],
        "organization": "Siemens Energy",
        "summary": "reporting the vulnerabilities"
      }
    ]
  },
  "product_tree": {
    "branches": [
      {
        "name": "Siemens",
        "category": "vendor",
        "branches": [
          {
            "name": "SIPROTEC 5 relays with CPU variants CP050",
            "category": "product_name",
            "branches": [
              {
                "name": "< V8.80",
                "category": "product_version_range",
                "product": {
                  "product_id": "1",
                  "name": "SIPROTEC 5 relays with CPU variants CP050"
                }
              }
            ]
          },
          {
            "name": "SIPROTEC 5 relays with CPU variants CP100",
            "category": "product_name",
            "branches": [
              {
                "name": "< V8.80",
                "category": "product_version_range",
                "product": {
                  "product_id": "2",
                  "name": "SIPROTEC 5 relays with CPU variants CP100"
                }
              }
            ]
          },
          {
            "name": "SIPROTEC 5 relays with CPU variants CP300",
            "category": "product_name",
            "branches": [
              {
                "name": "< V8.80",
                "category": "product_version_range",
                "product": {
                  "product_id": "3",
                  "name": "SIPROTEC 5 relays with CPU variants CP300"
                }
              }
            ]
          }
        ]
      }
    ]
  },
  "vulnerabilities": [
    {
      "title": "CVE-2021-33719",
      "notes": [
        {
          "title": "Summary",
          "category": "summary",
          "text": "Specially crafted packets sent to port 4443/tcp could cause a Denial-of-Service condition or potential remote code execution."
        }
      ],
      "cve": "CVE-2021-33719",
      "cwe": {
        "id": "CWE-120",
        "name": "Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')"
      },
      "product_status": {
        "known_affected": [
          "1",
          "2",
          "3"
        ]
      },
      "scores": [
        {
          "cvss_v3": {
            "version": "3.1",
            "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"
          },
          "products": [
            "1",
            "2",
            "3"
          ]
        }
      ],
      "remediations": [
        {
          "product_ids": [
            "1",
            "2",
            "3"
          ],
          "category": "vendor_fix",
          "details": "Update to V8.80 or later version",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109740816"
        },
        {
          "product_ids": [
            "1",
            "2",
            "3"
          ],
          "category": "workaround",
          "details": "Block access to port 4443/tcp e.g. with an external firewall"
        }
      ],
      "references": [
        {
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109740816",
          "summary": "CVE-2021-33719 - SIPROTEC 5 relays with CPU variants CP050"
        },
        {
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109740816",
          "summary": "CVE-2021-33719 - SIPROTEC 5 relays with CPU variants CP100"
        },
        {
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109740816",
          "summary": "CVE-2021-33719 - SIPROTEC 5 relays with CPU variants CP300"
        },
        {
          "url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2021-33719.json",
          "summary": "CVE-2021-33719 Mitre 5.0 json"
        }
      ]
    },
    {
      "title": "CVE-2021-33720",
      "notes": [
        {
          "title": "Summary",
          "category": "summary",
          "text": "Specially crafted packets sent to port 4443/tcp could cause a Denial-of-Service condition."
        }
      ],
      "cve": "CVE-2021-33720",
      "cwe": {
        "id": "CWE-120",
        "name": "Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')"
      },
      "product_status": {
        "known_affected": [
          "1",
          "2",
          "3"
        ]
      },
      "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",
            "3"
          ]
        }
      ],
      "remediations": [
        {
          "product_ids": [
            "1",
            "2",
            "3"
          ],
          "category": "vendor_fix",
          "details": "Update to V8.80 or later version",
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109740816"
        },
        {
          "product_ids": [
            "1",
            "2",
            "3"
          ],
          "category": "workaround",
          "details": "Block access to port 4443/tcp e.g. with an external firewall"
        }
      ],
      "references": [
        {
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109740816",
          "summary": "CVE-2021-33720 - SIPROTEC 5 relays with CPU variants CP050"
        },
        {
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109740816",
          "summary": "CVE-2021-33720 - SIPROTEC 5 relays with CPU variants CP100"
        },
        {
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109740816",
          "summary": "CVE-2021-33720 - SIPROTEC 5 relays with CPU variants CP300"
        },
        {
          "url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2021-33720.json",
          "summary": "CVE-2021-33720 Mitre 5.0 json"
        }
      ]
    }
  ]
}