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allow an unauthenticated, remote attacker to cause a BGP session to repeatedly reset, causing a partial denial of service (DoS) condition due to the BGP session being down. The vulnerability is due to incorrect parsing of a specific type of BGP MVPN update message. An attacker could exploit this vulnerability by sending this BGP MVPN update message to a targeted device. A successful exploit could allow the attacker to cause the BGP peer connections to reset, which could lead to BGP route instability and impact traffic. The incoming BGP MVPN update message is valid but is parsed incorrectly by the NX-OS device, which could send a corrupted BGP update to the configured BGP peer. Note: The Cisco implementation of BGP accepts incoming BGP traffic from only explicitly configured peers. To exploit this vulnerability, an attacker must send a specific BGP MVPN update message over an established TCP connection that appears to come from a trusted BGP peer. To do so, the attacker must obtain information about the BGP peers in the trusted network of the affected system."}, {"lang": "es", "value": "Una vulnerabilidad en la implementaci\u00f3n de Border Gateway Protocol (BGP) Multicast VPN (MVPN) de Cisco NX-OS Software, podr\u00eda permitir a un atacante remoto no autenticado causar que una sesi\u00f3n de BGP se reinicie repetidamente, conllevando a una condici\u00f3n de denegaci\u00f3n de servicio (DoS) parcial debido a la sesi\u00f3n de BGP est\u00e1 inactiva. La vulnerabilidad es debido al an\u00e1lisis incorrecto de un tipo espec\u00edfico de mensaje de actualizaci\u00f3n de BGP MVPN. Un atacante podr\u00eda explotar esta vulnerabilidad mediante el env\u00edo de este mensaje de actualizaci\u00f3n de BGP MVPN hacia un dispositivo objetivo. Una explotaci\u00f3n con \u00e9xito podr\u00eda permitir al atacante causar que las conexiones entre peers de BGP se restablezcan, lo que podr\u00eda conllevar a una inestabilidad en la ruta de BGP e impactar el tr\u00e1fico. El mensaje de actualizaci\u00f3n de BGP MVPN entrante es v\u00e1lido pero es analizado incorrectamente por el dispositivo NX-OS, lo que podr\u00eda enviar una actualizaci\u00f3n de BGP corrupta hacia el peer BGP configurado. Nota: La implementaci\u00f3n de Cisco de BGP acepta tr\u00e1fico BGP entrante solo de peers configurados expl\u00edcitamente. Para explotar esta vulnerabilidad, un atacante debe enviar un mensaje de actualizaci\u00f3n de BGP MVPN espec\u00edfico por medio de una conexi\u00f3n TCP establecida que parece provenir de un peer BGP confiable. Para hacerlo, el atacante debe obtener informaci\u00f3n sobre los peers BGP en la red confiable del sistema afectado"}], "id": "CVE-2020-3398", "lastModified": "2021-08-06T18:58:07.647", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.0"}, "exploitabilityScore": 3.9, "impactScore": 4.0, "source": "ykramarz@cisco.com", "type": "Secondary"}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.0, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2020-08-27T16:15:12.253", "references": [{"source": "ykramarz@cisco.com", "tags": ["Vendor Advisory"], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxosbgp-mvpn-dos-K8kbCrJp"}], "sourceIdentifier": "ykramarz@cisco.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-20"}], "source": "ykramarz@cisco.com", "type": "Secondary"}]}

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