nvd-json-data-feeds/CVE-2020/CVE-2020-117xx/CVE-2020-11742.json

{
  "id": "CVE-2020-11742",
  "sourceIdentifier": "cve@mitre.org",
  "published": "2020-04-14T13:15:12.923",
  "lastModified": "2020-07-13T16:15:11.467",
  "vulnStatus": "Modified",
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of bad continuation handling in GNTTABOP_copy. Grant table operations are expected to return 0 for success, and a negative number for errors. The fix for CVE-2017-12135 introduced a path through grant copy handling where success may be returned to the caller without any action taken. In particular, the status fields of individual operations are left uninitialised, and may result in errant behaviour in the caller of GNTTABOP_copy. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to copy a grant, it hits the incorrect exit path. This returns success to the caller without doing anything, which may cause crashes or other incorrect behaviour."
    },
    {
      "lang": "es",
      "value": "Se detect\u00f3 un problema en Xen versiones hasta 4.13.x, permitiendo a usuarios invitados del Sistema Operativo causar una denegaci\u00f3n de servicio debido a un manejo de continuaci\u00f3n inapropiado en GNTTABOP_copy. Se espera que las operaciones de la tabla de concesiones devuelvan 0 para el \u00e9xito y un n\u00famero negativo para los errores. La correcci\u00f3n para CVE-2017-12135 introdujo una ruta por medio del manejo de la copia de concesi\u00f3n donde el \u00e9xito puede ser devuelto al que llama sin tomar ninguna acci\u00f3n. En particular, los campos de estado de las operaciones individuales se dejan sin inicializar y pueden resultar en un comportamiento err\u00f3neo en el que llama de GNTTABOP_copy. Un invitado con errores o malicioso puede construir su tabla de concesi\u00f3n de tal manera que, cuando un dominio del back-end intenta copiar una concesi\u00f3n, llega a la ruta de salida incorrecta. Esto devuelve el \u00e9xito al que llama sin hacer nada, lo que puede causar bloqueos u otro comportamiento incorrecto."
    }
  ],
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          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM"
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