SSA-847986

Vulnerability from csaf_siemens - Published: 2021-09-14 00:00 - Updated: 2021-10-12 00:00
Summary
SSA-847986: Denial-of-Service Vulnerabilities in SIPROTEC 5 relays

Notes

Summary
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. Siemens has released an update for SIPROTEC 5 relays and recommends to update to the latest version.
General Recommendations
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. Siemens 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. As 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. Recommended security guidelines can be found at: https://www.siemens.com/gridsecurity
Additional Resources
For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories
Terms of Use
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.
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{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "Michael Messner"
        ],
        "organization": "Siemens Energy",
        "summary": "reporting the vulnerabilities"
      }
    ],
    "category": "Siemens Security Advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Disclosure is not limited.",
      "tlp": {
        "label": "WHITE"
      }
    },
    "notes": [
      {
        "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": "Summary"
      },
      {
        "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\u0027s 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": "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-847986: Denial-of-Service Vulnerabilities in SIPROTEC 5 relays - PDF Version",
        "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-847986.pdf"
      },
      {
        "category": "self",
        "summary": "SSA-847986: Denial-of-Service Vulnerabilities in SIPROTEC 5 relays - TXT Version",
        "url": "https://cert-portal.siemens.com/productcert/txt/ssa-847986.txt"
      },
      {
        "category": "self",
        "summary": "SSA-847986: Denial-of-Service Vulnerabilities in SIPROTEC 5 relays - CSAF Version",
        "url": "https://cert-portal.siemens.com/productcert/csaf/ssa-847986.json"
      }
    ],
    "title": "SSA-847986: Denial-of-Service Vulnerabilities in SIPROTEC 5 relays",
    "tracking": {
      "current_release_date": "2021-10-12T00:00:00Z",
      "generator": {
        "engine": {
          "name": "Siemens ProductCERT CSAF Generator",
          "version": "1"
        }
      },
      "id": "SSA-847986",
      "initial_release_date": "2021-09-14T00:00:00Z",
      "revision_history": [
        {
          "date": "2021-09-14T00:00:00Z",
          "legacy_version": "1.0",
          "number": "1",
          "summary": "Publication Date"
        },
        {
          "date": "2021-10-12T00:00:00Z",
          "legacy_version": "1.1",
          "number": "2",
          "summary": "Removed CP200 from list of affected products"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V8.80",
                "product": {
                  "name": "SIPROTEC 5 relays with CPU variants CP050",
                  "product_id": "1"
                }
              }
            ],
            "category": "product_name",
            "name": "SIPROTEC 5 relays with CPU variants CP050"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V8.80",
                "product": {
                  "name": "SIPROTEC 5 relays with CPU variants CP100",
                  "product_id": "2"
                }
              }
            ],
            "category": "product_name",
            "name": "SIPROTEC 5 relays with CPU variants CP100"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c V8.80",
                "product": {
                  "name": "SIPROTEC 5 relays with CPU variants CP300",
                  "product_id": "3"
                }
              }
            ],
            "category": "product_name",
            "name": "SIPROTEC 5 relays with CPU variants CP300"
          }
        ],
        "category": "vendor",
        "name": "Siemens"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-33719",
      "cwe": {
        "id": "CWE-120",
        "name": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
      },
      "notes": [
        {
          "category": "summary",
          "text": "Specially crafted packets sent to port 4443/tcp could cause a Denial-of-Service condition or potential remote code execution.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "1",
          "2",
          "3"
        ]
      },
      "references": [
        {
          "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://support.industry.siemens.com/cs/ww/en/view/109740816"
        },
        {
          "summary": "CVE-2021-33719 Mitre 5.0 json",
          "url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2021-33719.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Update to V8.80 or later version",
          "product_ids": [
            "1",
            "2",
            "3"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109740816"
        },
        {
          "category": "workaround",
          "details": "Block access to port 4443/tcp e.g. with an external firewall",
          "product_ids": [
            "1",
            "2",
            "3"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "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",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3"
          ]
        }
      ],
      "title": "CVE-2021-33719"
    },
    {
      "cve": "CVE-2021-33720",
      "cwe": {
        "id": "CWE-120",
        "name": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
      },
      "notes": [
        {
          "category": "summary",
          "text": "Specially crafted packets sent to port 4443/tcp could cause a Denial-of-Service condition.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "1",
          "2",
          "3"
        ]
      },
      "references": [
        {
          "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://support.industry.siemens.com/cs/ww/en/view/109740816"
        },
        {
          "summary": "CVE-2021-33720 Mitre 5.0 json",
          "url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2021-33720.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Update to V8.80 or later version",
          "product_ids": [
            "1",
            "2",
            "3"
          ],
          "url": "https://support.industry.siemens.com/cs/ww/en/view/109740816"
        },
        {
          "category": "workaround",
          "details": "Block access to port 4443/tcp e.g. with an external firewall",
          "product_ids": [
            "1",
            "2",
            "3"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "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",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3"
          ]
        }
      ],
      "title": "CVE-2021-33720"
    }
  ]
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.