cvelist/2021/34xxx/CVE-2021-34600.json

{
    "CVE_data_meta": {
        "ASSIGNER": "info@cert.vde.com",
        "DATE_PUBLIC": "2022-01-18T11:00:00.000Z",
        "ID": "CVE-2021-34600",
        "STATE": "PUBLIC",
        "TITLE": "Telenot complex: Insecure AES Key Generation"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "CompasX",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_value": "32.0"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "Telenot Electronic GmbH"
                }
            ]
        }
    },
    "credit": [
        {
            "lang": "eng",
            "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."
            }
        ]
    },
    "generator": {
        "engine": "Vulnogram 0.0.9"
    },
    "impact": {
        "cvss": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "name": "https://www.x41-dsec.de/lab/advisories/x41-2021-003-telenot-complex-insecure-keygen/",
                "refsource": "CONFIRM",
                "url": "https://www.x41-dsec.de/lab/advisories/x41-2021-003-telenot-complex-insecure-keygen/"
            }
        ]
    },
    "solution": [
        {
            "lang": "eng",
            "value": "Update to CompasX versions >= 32.0\n"
        }
    ],
    "source": {
        "defect": [
            "CERT@VDE#64025"
        ],
        "discovery": "EXTERNAL"
    },
    "work_around": [
        {
            "lang": "eng",
            "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."
        }
    ]
}