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The vulnerability is due to incorrect processing of a BGP update message that contains a specific BGP attribute. An attacker could exploit this vulnerability by sending BGP update messages that include a specific, malformed attribute to be processed by an affected system. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic only from explicitly defined peers. To exploit this vulnerability, the malicious BGP update message would need to come from a configured, valid BGP peer or would need to be injected by the attacker into the victim&rsquo;s BGP network on an existing, valid TCP connection to a BGP peer."}, {"lang": "es", "value": "Una vulnerabilidad en la implementaci\u00f3n de la funcionalidad Border Gateway Protocol (BGP) en Cisco IOS XR Software, podr\u00eda permitir a un atacante remoto no autenticado causar una condici\u00f3n de denegaci\u00f3n de servicio (DoS). La vulnerabilidad es debido al procesamiento incorrecto de un mensaje de actualizaci\u00f3n BGP que contiene un atributo BGP espec\u00edfico. Un atacante podr\u00eda explotar esta vulnerabilidad mediante el env\u00edo de mensajes de actualizaci\u00f3n de BGP que incluyan un atributo espec\u00edfico con malformaci\u00f3n para que un sistema afectado lo procese. Una explotaci\u00f3n con \u00e9xito podr\u00eda permitir al atacante causar que el proceso BGP se reinicie inesperadamente, resultando en una condici\u00f3n DoS. La implementaci\u00f3n de Cisco de BGP acepta el tr\u00e1fico de BGP entrante solo desde peers definidos expl\u00edcitamente. Para explotar esta vulnerabilidad, el mensaje de actualizaci\u00f3n de BGP malicioso necesitar\u00eda venir de un peer BGP v\u00e1lido y configurado o el atacante deber\u00eda inyectarlo en la red BGP victim\u2019s en una conexi\u00f3n TCP v\u00e1lida existente a un peer BGP."}], "id": "CVE-2019-15989", "lastModified": "2020-01-29T19:46:44.363", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "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": "2020-01-26T05:15:13.567", "references": [{"source": "ykramarz@cisco.com", "tags": ["Vendor Advisory"], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-bgp-dos"}], "sourceIdentifier": "ykramarz@cisco.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-754"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-754"}], "source": "ykramarz@cisco.com", "type": "Secondary"}]}

{}