GSD-2021-34600

Vulnerability from gsd - Updated: 2023-12-13 01:23
Details
Telenot CompasX versions prior to 32.0 use a weak seed for random number generation leading to predictable AES keys used in the NFC tags used for local authorization of users. This may lead to total loss of trustworthiness of the installation.
Aliases
Aliases
CVE-2021-34600
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{
  "GSD": {
    "alias": "CVE-2021-34600",
    "description": "Telenot CompasX versions prior to 32.0 use a weak seed for random number generation leading to predictable AES keys used in the NFC tags used for authorization of users.",
    "id": "GSD-2021-34600"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-34600"
      ],
      "details": "Telenot CompasX versions prior to 32.0 use a weak seed for random number generation leading to predictable AES keys used in the NFC tags used for local authorization of users. This may lead to total loss of trustworthiness of the installation.\n\n",
      "id": "GSD-2021-34600",
      "modified": "2023-12-13T01:23:14.350843Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "info@cert.vde.com",
        "ID": "CVE-2021-34600",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "CompasX",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_name": "unspecified",
                          "version_value": "32.0"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Telenot Electronic GmbH"
            }
          ]
        }
      },
      "credits": [
        {
          "lang": "en",
          "value": "X41 D-SEC GmbH, Markus Vervier, Yasar Klawohn"
        }
      ],
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "Telenot CompasX versions prior to 32.0 use a weak seed for random number generation leading to predictable AES keys used in the NFC tags used for local authorization of users. This may lead to total loss of trustworthiness of the installation.\n\n"
          }
        ]
      },
      "generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "impact": {
        "cvss": [
          {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "cweId": "CWE-335",
                "lang": "eng",
                "value": "CWE-335 Incorrect Usage of Seeds in Pseudo-Random Number Generator (PRNG)"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://www.x41-dsec.de/lab/advisories/x41-2021-003-telenot-complex-insecure-keygen/",
            "refsource": "MISC",
            "url": "https://www.x41-dsec.de/lab/advisories/x41-2021-003-telenot-complex-insecure-keygen/"
          }
        ]
      },
      "solution": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eUpdate to CompasX versions \u0026gt;= 32.0\u003c/p\u003e"
            }
          ],
          "value": "Update to CompasX versions \u003e= 32.0\n\n"
        }
      ],
      "source": {
        "defect": [
          "CERT@VDE#64025"
        ],
        "discovery": "EXTERNAL"
      },
      "work_around": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eIt is strongly recommended to raise the security level during the time window until the AES keys can be changed to securely generated ones. The complex alarm systems supports alternative authentication factors that can be combined with the Desfire NFC tag authentication. An example for such an additional factor is a requirement for a valid PIN entry on the complex alarm system in addition to a successful Desfire authentication to disarm the alarm.\u003c/p\u003e"
            }
          ],
          "value": "It is strongly recommended to raise the security level during the time window until the AES keys can be changed to securely generated ones. The complex alarm systems supports alternative authentication factors that can be combined with the Desfire NFC tag authentication. An example for such an additional factor is a requirement for a valid PIN entry on the complex alarm system in addition to a successful Desfire authentication to disarm the alarm.\n\n"
        }
      ]
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:telenot:compasx:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "32.0",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
        "CVE_data_meta": {
          "ASSIGNER": "info@cert.vde.com",
          "ID": "CVE-2021-34600"
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "en",
              "value": "Telenot CompasX versions prior to 32.0 use a weak seed for random number generation leading to predictable AES keys used in the NFC tags used for local authorization of users. This may lead to total loss of trustworthiness of the installation.\n\n"
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-335"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://www.x41-dsec.de/lab/advisories/x41-2021-003-telenot-complex-insecure-keygen/",
              "refsource": "CONFIRM",
              "tags": [
                "Exploit",
                "Third Party Advisory"
              ],
              "url": "https://www.x41-dsec.de/lab/advisories/x41-2021-003-telenot-complex-insecure-keygen/"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 4.9,
            "confidentialityImpact": "COMPLETE",
            "integrityImpact": "NONE",
            "vectorString": "AV:L/AC:L/Au:N/C:C/I:N/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 6.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2023-08-09T11:15Z",
      "publishedDate": "2022-01-20T12:15Z"
    }
  }
}


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Sightings

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Nomenclature

  • 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.