GSD-2023-4346

Vulnerability from gsd - Updated: 2023-12-13 01:20
Details
KNX devices that use KNX Connection Authorization and support Option 1 are, depending on the implementation, vulnerable to being locked and users being unable to reset them to gain access to the device. The BCU key feature on the devices can be used to create a password for the device, but this password can often not be reset without entering the current password. If the device is configured to interface with a network, an attacker with access to that network could interface with the KNX installation, purge all devices without additional security options enabled, and set a BCU key, locking the device. Even if a device is not connected to a network, an attacker with physical access to the device could also exploit this vulnerability in the same way.
Aliases
Aliases
CVE-2023-4346
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{
  "GSD": {
    "alias": "CVE-2023-4346",
    "id": "GSD-2023-4346"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2023-4346"
      ],
      "details": "\nKNX devices that use KNX Connection Authorization and support Option 1 are, depending on the implementation, vulnerable to being locked and users being unable to reset them to gain access to the device. The BCU key feature on the devices can be used to create a password for the device, but this password can often not be reset without entering the current password. If the device is configured to interface with a network, an attacker with access to that network could interface with the KNX installation, purge all devices without additional security options enabled, and set a BCU key, locking the device. Even if a device is not connected to a network, an attacker with physical access to the device could also exploit this vulnerability in the same way. \n\n",
      "id": "GSD-2023-4346",
      "modified": "2023-12-13T01:20:27.505633Z",
      "schema_version": "1.4.0"
    }
  },
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      "affects": {
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          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "KNX Protocol Connection Authorization Option 1",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "=",
                          "version_value": "0"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "KNX Association"
            }
          ]
        }
      },
      "credits": [
        {
          "lang": "en",
          "value": "Felix Eberstaller"
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          "value": "Limes Security"
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            "value": "\nKNX devices that use KNX Connection Authorization and support Option 1 are, depending on the implementation, vulnerable to being locked and users being unable to reset them to gain access to the device. The BCU key feature on the devices can be used to create a password for the device, but this password can often not be reset without entering the current password. If the device is configured to interface with a network, an attacker with access to that network could interface with the KNX installation, purge all devices without additional security options enabled, and set a BCU key, locking the device. Even if a device is not connected to a network, an attacker with physical access to the device could also exploit this vulnerability in the same way. \n\n"
          }
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            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
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      "problemtype": {
        "problemtype_data": [
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            "description": [
              {
                "cweId": "CWE-645",
                "lang": "eng",
                "value": "CWE-645 Overly Restrictive Account Lockout Mechanism"
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      "references": {
        "reference_data": [
          {
            "name": "https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01",
            "refsource": "MISC",
            "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01"
          }
        ]
      },
      "source": {
        "discovery": "UNKNOWN"
      },
      "work_around": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\n\n\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eThe KNX Association recommends users always set the BCU Key in every KNX Project that is already finished and will be commissioned in the future. Handover the BCU Key as part of the Project Documentation to the Building Owner. \u003c/span\u003e\n\n\u003cbr\u003e"
            }
          ],
          "value": "\nThe KNX Association recommends users always set the BCU Key in every KNX Project that is already finished and will be commissioned in the future. Handover the BCU Key as part of the Project Documentation to the Building Owner. \n\n\n"
        }
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          "ID": "CVE-2023-4346"
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        "description": {
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              "value": "\nKNX devices that use KNX Connection Authorization and support Option 1 are, depending on the implementation, vulnerable to being locked and users being unable to reset them to gain access to the device. The BCU key feature on the devices can be used to create a password for the device, but this password can often not be reset without entering the current password. If the device is configured to interface with a network, an attacker with access to that network could interface with the KNX installation, purge all devices without additional security options enabled, and set a BCU key, locking the device. Even if a device is not connected to a network, an attacker with physical access to the device could also exploit this vulnerability in the same way. \n\n"
            }
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              "name": "https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01",
              "refsource": "MISC",
              "tags": [
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      "impact": {
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            "attackComplexity": "LOW",
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            "confidentialityImpact": "NONE",
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            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2023-09-11T17:47Z",
      "publishedDate": "2023-08-29T20:15Z"
    }
  }
}


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