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CVE-2018-10903

Estado: ModificadaAlta (7.5)—

A flaw was found in python-cryptography versions between >=1.9.0 and <2.3. The finalize_with_tag API did not enforce a minimum tag length. If a user did not validate the input length prior to passing it to finalize_with_tag an attacker could craft an invalid payload with a shortened tag (e.g. 1 byte) such that they would have a 1 in 256 chance of passing the MAC check. GCM tag forgeries can cause key leakage.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (3)

Canonical — Ubuntu LinuxCryptography — Python-cryptographyRedhat — Openstack

CWE

Referencias

JSON original (NVD)

Mostrar
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          "authentication": "NONE",
          "integrityImpact": "NONE",
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          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
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          "privilegesRequired": "NONE",
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  "published": "2018-07-30T16:29:00.283",
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      "value": "A flaw was found in python-cryptography versions between >=1.9.0 and <2.3. The finalize_with_tag API did not enforce a minimum tag length. If a user did not validate the input length prior to passing it to finalize_with_tag an attacker could craft an invalid payload with a shortened tag (e.g. 1 byte) such that they would have a 1 in 256 chance of passing the MAC check. GCM tag forgeries can cause key leakage."
    },
    {
      "lang": "es",
      "value": "Se ha encontrado un error en python-cryptography, desde la versión 1.9.0 hasta la 2.3. La API finalize_with_tag no forzaba una longitud de etiqueta mínima. Si un usuario no validaba la longitud de la entrada antes de pasarla a finalize_with_tag, un atacante podría manipular una carga útil no válida con una etiqueta acortada (p.ej., 1 byte) para así tener 1 posibilidad entre 256 de pasar la comprobación MAC. Las falsificaciones de etiquetas GCM pueden provocar un filtrado de claves."
    }
  ],
  "lastModified": "2026-06-17T01:34:53.027",
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