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This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted Cisco UDLD protocol packets to a directly connected, affected device. A successful exploit could allow the attacker to execute arbitrary code with administrative privileges or cause the Cisco UDLD process to crash and restart multiple times, causing the affected device to reload and resulting in a DoS condition. Note: The UDLD feature is disabled by default, and the conditions to exploit this vulnerability are strict. The attacker needs full control of a directly connected device. That device must be connected over a port channel that has UDLD enabled. To trigger arbitrary code execution, both the UDLD-enabled port channel and specific system conditions must exist. In the absence of either the UDLD-enabled port channel or the system conditions, attempts to exploit this vulnerability will result in a DoS condition. It is possible, but highly unlikely, that an attacker could control the necessary conditions for exploitation. The CVSS score reflects this possibility. However, given the complexity of exploitation, Cisco has assigned a Medium Security Impact Rating (SIR) to this vulnerability."}, {"lang": "es", "value": "Una vulnerabilidad en la funcionalidad Unidirectional Link Detection (UDLD) del Software Cisco FXOS y el Software Cisco NX-OS, podr\u00eda permitir a un atacante adyacente no autenticado ejecutar c\u00f3digo arbitrario con privilegios administrativos o causar una condici\u00f3n de denegaci\u00f3n de servicio (DoS) en un dispositivo afectado. Esta vulnerabilidad es debido a una comprobaci\u00f3n de entrada insuficiente. Un atacante podr\u00eda explotar esta vulnerabilidad mediante el env\u00edo de paquetes de protocolo Cisco UDLD dise\u00f1ados a un dispositivo afectado directamente conectado. Una explotaci\u00f3n con \u00e9xito podr\u00eda permitir al atacante ejecutar c\u00f3digo arbitrario con privilegios administrativos o hacer que el proceso de UDLD de Cisco se bloquee y se reinicie varias veces, causando que el dispositivo afectado se recargue y resulte en una condici\u00f3n de DoS. Nota: La funci\u00f3n UDLD est\u00e1 deshabilitada por defecto y las condiciones para explotar esta vulnerabilidad son estrictas. El atacante necesita el control total de un dispositivo conectado directamente. Ese dispositivo debe estar conectado a trav\u00e9s de un canal de puerto que tenga UDLD habilitado. Para activar la ejecuci\u00f3n de c\u00f3digo arbitraria, deben existir tanto el canal de puerto habilitado para UDLD como las condiciones espec\u00edficas del sistema. En ausencia del canal de puerto habilitado para UDLD o de las condiciones del sistema, los intentos de explotar esta vulnerabilidad resultar\u00e1n en una condici\u00f3n de DoS. Es posible, pero muy poco probable, que un atacante pueda controlar las condiciones necesarias para la explotaci\u00f3n. La puntuaci\u00f3n CVSS refleja esta posibilidad. Sin embargo, dada la complejidad de la explotaci\u00f3n, Cisco ha asignado una calificaci\u00f3n de impacto de seguridad media (SIR) a esta vulnerabilidad"}], "id": "CVE-2021-1368", "lastModified": "2023-11-07T03:28:07.040", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "ADJACENT_NETWORK", "authentication": "SINGLE", "availabilityImpact": "PARTIAL", "baseScore": 4.9, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:A/AC:M/Au:S/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 4.4, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "ykramarz@cisco.com", "type": "Secondary"}]}, "published": "2021-02-24T20:15:13.473", "references": [{"source": "ykramarz@cisco.com", "tags": ["Vendor Advisory"], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-udld-rce-xetH6w35"}], "sourceIdentifier": "ykramarz@cisco.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "ykramarz@cisco.com", "type": "Primary"}]}

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