CVE-2022-20866

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The following conditions may be observed on an affected device: This vulnerability will apply to approximately 5 percent of the RSA keys on a device that is running a vulnerable release of Cisco ASA Software or Cisco FTD Software; not all RSA keys are expected to be affected due to mathematical calculations applied to the RSA key. The RSA key could be valid but have specific characteristics that make it vulnerable to the potential leak of the RSA private key. If an attacker obtains the RSA private key, they could use the key to impersonate a device that is running Cisco ASA Software or Cisco FTD Software or to decrypt the device traffic. See the Indicators of Compromise section for more information on the detection of this type of RSA key. The RSA key could be malformed and invalid. 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This vulnerability is due to a logic error when the RSA key is stored in memory on a hardware platform that performs hardware-based cryptography. An attacker could exploit this vulnerability by using a Lenstra side-channel attack against the targeted device. A successful exploit could allow the attacker to retrieve the RSA private key. The following conditions may be observed on an affected device: This vulnerability will apply to approximately 5 percent of the RSA keys on a device that is running a vulnerable release of Cisco ASA Software or Cisco FTD Software; not all RSA keys are expected to be affected due to mathematical calculations applied to the RSA key. The RSA key could be valid but have specific characteristics that make it vulnerable to the potential leak of the RSA private key. If an attacker obtains the RSA private key, they could use the key to impersonate a device that is running Cisco ASA Software or Cisco FTD Software or to decrypt the device traffic. See the Indicators of Compromise section for more information on the detection of this type of RSA key. The RSA key could be malformed and invalid. A malformed RSA key is not functional, and a TLS client connection to a device that is running Cisco ASA Software or Cisco FTD Software that uses the malformed RSA key will result in a TLS signature failure, which means a vulnerable software release created an invalid RSA signature that failed verification. If an attacker obtains the RSA private key, they could use the key to impersonate a device that is running Cisco ASA Software or Cisco FTD Software or to decrypt the device traffic."}, {"lang": "es", "value": "Una vulnerabilidad en el manejo de las claves RSA en los dispositivos que ejecutan el software Cisco Adaptive Security Appliance (ASA) y el software Cisco Firepower Threat Defense (FTD) podr\u00eda permitir a un atacante remoto no autenticado recuperar una clave privada RSA. Esta vulnerabilidad es debido a un error l\u00f3gico cuando la clave RSA es almacenada en la memoria de una plataforma de hardware que lleva a cabo criptograf\u00eda basada en hardware. Un atacante podr\u00eda explotar esta vulnerabilidad al usar un ataque de canal lateral Lenstra contra el dispositivo objetivo. Una explotaci\u00f3n con \u00e9xito podr\u00eda permitir al atacante recuperar la clave privada RSA. Las siguientes condiciones pueden observarse en un dispositivo afectado: Esta vulnerabilidad ser\u00e1 aplicada a aproximadamente el 5 por ciento de las claves RSA en un dispositivo que est\u00e9 ejecutando una versi\u00f3n vulnerable del software Cisco ASA o del software Cisco FTD; no es esperado que todas las claves RSA sean afectadas debido a c\u00e1lculos matem\u00e1ticos aplicados a la clave RSA. La clave RSA podr\u00eda ser v\u00e1lida pero tener caracter\u00edsticas espec\u00edficas que la hacen vulnerable a una posible filtraci\u00f3n de la clave privada RSA. Si un atacante obtiene la clave privada RSA, podr\u00eda usarla para hacerse pasar por un dispositivo que est\u00e9 ejecutando el software Cisco ASA o el software Cisco FTD o para descifrar el tr\u00e1fico del dispositivo. Consulte la secci\u00f3n Indicadores de compromiso para obtener m\u00e1s informaci\u00f3n sobre la detecci\u00f3n de este tipo de clave RSA. La clave RSA podr\u00eda estar malformada y no ser v\u00e1lida. Una clave RSA malformada no es funcional, y una conexi\u00f3n de cliente TLS a un dispositivo que ejecuta el software Cisco ASA o el software Cisco FTD que usa la clave RSA malformada resultar\u00e1 en un fallo de la firma TLS, lo que significa que una versi\u00f3n de software vulnerable cre\u00f3 una firma RSA no v\u00e1lida que fall\u00f3 en la verificaci\u00f3n. Si un atacante obtiene la clave privada RSA, podr\u00eda usarla para hacerse pasar por un dispositivo que est\u00e9 ejecutando el software Cisco ASA o el software Cisco FTD o para descifrar el tr\u00e1fico del dispositivo"}], "id": "CVE-2022-20866", "lastModified": "2026-08-11T19:33:44.513", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.2, "source": "psirt@cisco.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-20866", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2024-11-01T18:42:20.599063Z", "version": "2.0.3"}}]}, "published": "2022-08-10T17:15:08.487", "references": [{"source": "psirt@cisco.com", "tags": ["Vendor Advisory"], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rsa-key-leak-Ms7UEfZz"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rsa-key-leak-Ms7UEfZz"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-203"}], "source": "psirt@cisco.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-203"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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