fkie_cve-2025-40919
Vulnerability from fkie_nvd
Published
2025-07-16 14:15
Modified
2025-07-16 21:15
Severity ?
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Summary
Authen::DigestMD5 versions 0.01 through 0.02 for Perl generate the cnonce insecurely. The cnonce (client nonce) is generated from an MD5 hash of the PID, the epoch time and the built-in rand function. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage. According to RFC 2831, "The cnonce-value is an opaque quoted string value provided by the client and used by both client and server to avoid chosen plaintext attacks, and to provide mutual authentication. The security of the implementation depends on a good choice. It is RECOMMENDED that it contain at least 64 bits of entropy."
References
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://datatracker.ietf.org/doc/html/rfc2831
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://metacpan.org/release/SALVA/Authen-DigestMD5-0.01/source/DigestMD5.pm#L126
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Authen::DigestMD5 versions 0.01 through 0.02 for Perl generate the cnonce insecurely.\n\nThe cnonce (client nonce) is generated from an MD5 hash of the PID, the epoch time and the built-in rand function. The PID will come from a small set of numbers, and the epoch time may be guessed, if it is not leaked from the HTTP Date header. The built-in rand function is unsuitable for cryptographic usage.\n\nAccording to RFC 2831, \"The cnonce-value is an opaque quoted string value provided by the client and used by both client and server to avoid chosen plaintext attacks, and to provide mutual authentication. The security of the implementation depends on a good choice. It is RECOMMENDED that it contain at least 64 bits of entropy.\""
    },
    {
      "lang": "es",
      "value": "Las versiones 0.01 a 0.02 de Authen::DigestMD5 para Perl generan el cnonce de forma insegura. El cnonce (nonce del cliente) se genera a partir de un hash MD5 del PID, la fecha de la \u00e9poca y la funci\u00f3n rand integrada. El PID se obtendr\u00e1 de un peque\u00f1o conjunto de n\u00fameros, y la fecha de la \u00e9poca puede ser deducible si no se filtra del encabezado HTTP Date. La funci\u00f3n rand integrada no es adecuada para uso criptogr\u00e1fico. Seg\u00fan la RFC 2831, \u00abEl valor cnonce es un valor de cadena opaco entre comillas proporcionado por el cliente y utilizado tanto por el cliente como por el servidor para evitar ataques de texto plano y proporcionar autenticaci\u00f3n mutua. La seguridad de la implementaci\u00f3n depende de una buena elecci\u00f3n. Se RECOMIENDA que contenga al menos 64 bits de entrop\u00eda\u00bb."
    }
  ],
  "id": "CVE-2025-40919",
  "lastModified": "2025-07-16T21:15:27.623",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.5,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-07-16T14:15:25.480",
  "references": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://datatracker.ietf.org/doc/html/rfc2831"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "url": "https://metacpan.org/release/SALVA/Authen-DigestMD5-0.01/source/DigestMD5.pm#L126"
    }
  ],
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-338"
        },
        {
          "lang": "en",
          "value": "CWE-340"
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary"
    }
  ]
}


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