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nvd-json-data-feeds/CVE-2020/CVE-2020-256xx/CVE-2020-25687.json

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{
"id": "CVE-2020-25687",
"sourceIdentifier": "secalert@redhat.com",
"published": "2021-01-20T17:15:13.060",
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"lastModified": "2024-11-21T05:18:28.237",
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"vulnStatus": "Modified",
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"cveTags": [],
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"descriptions": [
{
"lang": "en",
"value": "A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. This flaw allows a remote attacker, who can create valid DNS replies, to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in sort_rrset() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability."
},
{
"lang": "es",
"value": "Se encontr\u00f3 un fallo en dnsmasq versiones anteriores a 2.83. Se detect\u00f3 un desbordamiento del b\u00fafer en la regi\u00f3n heap de la memoria en dnsmasq cuando DNSSEC est\u00e1 habilitado y antes de comprobar las entradas DNS recibidas. Este fallo permite a un atacante remoto, que puede crear respuestas DNS v\u00e1lidas, causar un desbordamiento en una memoria asignada a la pila. Este fallo es causado por una falta de comprobaci\u00f3n de longitud en la funci\u00f3n rfc1035.c:extract_name(), que podr\u00eda ser abusado para hacer que el c\u00f3digo ejecutar memcpy() con un tama\u00f1o negativo en sort_rrset() y causar un bloqueo en dnsmasq, resultando en una denegaci\u00f3n de servicio. La mayor amenaza de esta vulnerabilidad es la disponibilidad del sistema"
}
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"baseScore": 5.9,
"baseSeverity": "MEDIUM",
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"attackVector": "NETWORK",
"attackComplexity": "HIGH",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
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"availabilityImpact": "HIGH"
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},
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"baseScore": 7.1,
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"accessVector": "NETWORK",
"accessComplexity": "MEDIUM",
"authentication": "NONE",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
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"availabilityImpact": "COMPLETE"
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},
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{
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"source": "secalert@redhat.com",
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"type": "Primary",
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"description": [
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"value": "CWE-122"
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}
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