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An unauthenticated attacker could exploit this vulnerability by brute forcing valid session handlers. An authenticated attacker could exploit this vulnerability by connecting to the AnyConnect VPN service of an affected device to retrieve a valid session handler and, based on that handler, predict further valid session handlers. The attacker would then send a crafted HTTPS request using the brute-forced or predicted session handler to the AnyConnect VPN server of the device. A successful exploit could allow the attacker to terminate targeted SSL VPN sessions, forcing remote users to initiate new VPN connections and reauthenticate."}, {"lang": "es", "value": "Una vulnerabilidad en el servidor VPN de Cisco AnyConnect de los dispositivos Cisco Meraki MX y Cisco Meraki Z Series Teleworker Gateway podr\u00eda permitir que un atacante remoto no autenticado provoque una condici\u00f3n de denegaci\u00f3n de servicio (DoS) para usuarios espec\u00edficos del servicio AnyConnect en un dispositivo afectado. Esta vulnerabilidad se debe a una entrop\u00eda insuficiente para los controladores que se utilizan durante el establecimiento de una sesi\u00f3n VPN SSL. Un atacante no autenticado podr\u00eda explotar esta vulnerabilidad mediante la fuerza bruta de controladores de sesi\u00f3n v\u00e1lidos. Un atacante autenticado podr\u00eda explotar esta vulnerabilidad conect\u00e1ndose al servicio VPN AnyConnect de un dispositivo afectado para recuperar un controlador de sesi\u00f3n v\u00e1lido y, en funci\u00f3n de ese controlador, predecir otros controladores de sesi\u00f3n v\u00e1lidos. A continuaci\u00f3n, el atacante enviar\u00eda una solicitud HTTPS manipulada mediante el controlador de sesi\u00f3n forzado o previsto al servidor VPN AnyConnect del dispositivo. Una explotaci\u00f3n exitosa podr\u00eda permitir al atacante finalizar sesiones VPN SSL espec\u00edficas, lo que obligar\u00eda a los usuarios remotos a iniciar nuevas conexiones VPN y volver a autenticarse."}], "id": "CVE-2024-20513", "lastModified": "2024-10-08T21:16:54.820", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.8, "baseSeverity": "MEDIUM", "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:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "ykramarz@cisco.com", "type": "Secondary"}]}, "published": "2024-10-02T19:15:15.210", "references": [{"source": "ykramarz@cisco.com", "tags": ["Vendor Advisory"], "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-meraki-mx-vpn-dos-QTRHzG2"}], "sourceIdentifier": "ykramarz@cisco.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-639"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-639"}], "source": "ykramarz@cisco.com", "type": "Secondary"}]}

{}