{
  "document": {
    "acknowledgments": [
      {
        "organization": "CERTVDE",
        "summary": "coordination",
        "urls": [
          "https://certvde.com"
        ]
      },
      {
        "names": [
          "Benedikt K\u00fchne"
        ],
        "organization": "Siemens Energy",
        "summary": "reporting",
        "urls": [
          "https://www.siemens-energy.com"
        ]
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-GB",
    "notes": [
      {
        "category": "summary",
        "text": "With TwinCAT/BSD based products the HTTPS request to the Authelia login page accepts user-controlled input that specifies a link to an external site.",
        "title": "Summary"
      },
      {
        "category": "description",
        "text": "By default TwinCAT/BSD based products have Authelia installed and configured to perform the user authentication for web applications hosted on a target. This installation and configuration is provided with the package named \u0027authelia-bhf\u0027. With the affected versions of the package Authelia is configured to accept user-controlled input via URL parameter that specifies a link which can then be a link to an arbitrary external site.\n\nPlease note: The sources for the package \u0027authelia-bhf\u0027 are a fork from the original Open Source Software called \u0027Authelia\u0027. The vulnerability was exclusively introduced with that fork and has been removed there. It never became part of \u0027Authelia\u0027.",
        "title": "Impact"
      },
      {
        "category": "description",
        "text": "Use firewall or web-proxy technology at your network perimeter which allow internal clients to access only trusted external sites directly.",
        "title": "Mitigation"
      },
      {
        "category": "description",
        "text": "Please update to a recent version of the affected product.",
        "title": "Remediation"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "product-securityincident@beckhoff.com",
      "name": "Beckhoff Automation GmbH \u0026 Co. KG",
      "namespace": "https://www.beckhoff.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "VDE-2023-067: Beckhoff: Open redirect in TwinCAT/BSD package authelia-bhf - HTML",
        "url": "https://certvde.com/de/advisories/VDE-2023-067/"
      },
      {
        "category": "external",
        "summary": "CERT@VDE Security Advisories for Beckhoff Automation GmbH \u0026 Co. KG",
        "url": "https://certvde.com/en/advisories/vendor/beckhoff/"
      },
      {
        "category": "self",
        "summary": "VDE-2023-067: Beckhoff: Open redirect in TwinCAT/BSD package authelia-bhf - CSAF",
        "url": "https://beckhoff.csaf-tp.certvde.com/.well-known/csaf/white/2023/vde-2023-067.json"
      }
    ],
    "title": "Beckhoff: Open redirect in TwinCAT/BSD package authelia-bhf",
    "tracking": {
      "aliases": [
        "VDE-2023-067"
      ],
      "current_release_date": "2025-05-22T13:03:10.000Z",
      "generator": {
        "date": "2025-04-10T15:03:49.421Z",
        "engine": {
          "name": "Secvisogram",
          "version": "2.5.23"
        }
      },
      "id": "VDE-2023-067",
      "initial_release_date": "2023-12-13T08:00:00.000Z",
      "revision_history": [
        {
          "date": "2023-12-13T08:00:00.000Z",
          "number": "1",
          "summary": "initial revision"
        },
        {
          "date": "2025-05-22T13:03:10.000Z",
          "number": "2",
          "summary": "Fix: added distribution, quotation mark"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "authelia-bhf included in TwinCAT/BSD",
                "product": {
                  "name": "authelia-bhf included in TwinCAT/BSD",
                  "product_id": "CSAFPID-11001"
                }
              }
            ],
            "category": "product_family",
            "name": "Hardware"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c4.37.5",
                "product": {
                  "name": "Firmware \u003c4.37.5",
                  "product_id": "CSAFPID-21001"
                }
              },
              {
                "category": "product_version",
                "name": "4.37.5",
                "product": {
                  "name": "Firmware 4.37.5",
                  "product_id": "CSAFPID-22001"
                }
              }
            ],
            "category": "product_family",
            "name": "Firmware"
          }
        ],
        "category": "vendor",
        "name": "Beckhoff Automation GmbH \u0026 Co. KG"
      }
    ],
    "relationships": [
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware \u003c4.37.5 installed on authelia-bhf included in TwinCAT/BSD",
          "product_id": "CSAFPID-31001"
        },
        "product_reference": "CSAFPID-21001",
        "relates_to_product_reference": "CSAFPID-11001"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Firmware 4.37.5 installed on authelia-bhf included in TwinCAT/BSD",
          "product_id": "CSAFPID-32001"
        },
        "product_reference": "CSAFPID-22001",
        "relates_to_product_reference": "CSAFPID-11001"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2023-6545",
      "cwe": {
        "id": "CWE-601",
        "name": "URL Redirection to Untrusted Site (\u0027Open Redirect\u0027)"
      },
      "notes": [
        {
          "category": "summary",
          "text": "The package authelia-bhf included in Beckhoffs TwinCAT/BSD is prone to an open redirect that allows a remote unprivileged attacker to redirect a user to another site. This may have limited impact to integrity and does solely affect anthelia-bhf the Beckhoff fork of authelia."
        }
      ],
      "product_status": {
        "fixed": [
          "CSAFPID-32001"
        ],
        "known_affected": [
          "CSAFPID-31001"
        ]
      },
      "remediations": [
        {
          "category": "mitigation",
          "details": "Use firewall or web-proxy technology at your network perimeter which allow internal clients to access only trusted external sites directly.",
          "product_ids": [
            "CSAFPID-31001"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Please update to a recent version of the affected product.",
          "product_ids": [
            "CSAFPID-31001"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "environmentalScore": 4.3,
            "environmentalSeverity": "MEDIUM",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 4.3,
            "temporalSeverity": "MEDIUM",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-31001"
          ]
        }
      ],
      "title": "CVE-2023-6545"
    }
  ]
}