CVE-2022-20758

{"id": "CVE-2022-20758", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 7.1, "accessVector": "NETWORK", "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:C", "authentication": "NONE", "integrityImpact": "NONE", "accessComplexity": "MEDIUM", "availabilityImpact": "COMPLETE", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 6.9, "baseSeverity": "HIGH", "obtainAllPrivilege": false, "exploitabilityScore": 8.6, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.8, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 4.0, "exploitabilityScore": 2.2}, {"type": "Secondary", "source": "ykramarz@cisco.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.8, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 4.0, "exploitabilityScore": 2.2}]}, "published": "2022-04-15T15:15:13.883", "references": [{"url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bgpevpn-zWTRtPBb", "tags": ["Vendor Advisory"], "source": "ykramarz@cisco.com"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}, {"type": "Secondary", "source": "ykramarz@cisco.com", "description": [{"lang": "en", "value": "CWE-399"}]}], "descriptions": [{"lang": "en", "value": "A vulnerability in the implementation of the Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to the incorrect processing of a BGP update message that contains specific EVPN attributes. An attacker could exploit this vulnerability by sending a BGP update message that contains specific EVPN attributes. To exploit this vulnerability, an attacker must control a BGP speaker that has an established trusted peer connection to an affected device that is configured with the address family L2VPN EVPN to receive and process the update message. This vulnerability cannot be exploited by any data that is initiated by clients on the Layer 2 network or by peers that are not configured to accept the L2VPN EVPN address family. 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 updates only from explicitly defined peers. For this vulnerability to be exploited, the malicious BGP update message must either come from a configured, valid BGP peer or be injected by the attacker into the affected BGP network on an existing, valid TCP connection to a BGP peer."}, {"lang": "es", "value": "Una vulnerabilidad en la implementaci\u00f3n de la funcionalidad Ethernet VPN (EVPN) del Protocolo de Pasarela de Frontera (BGP) en el software Cisco IOS XR podr\u00eda permitir a un atacante remoto no autenticado causar una condici\u00f3n de denegaci\u00f3n de servicio (DoS). Esta vulnerabilidad es debido a un procesamiento incorrecto de un mensaje de actualizaci\u00f3n de BGP que contiene atributos espec\u00edficos de EVPN. Un atacante podr\u00eda explotar esta vulnerabilidad mediante el env\u00edo de un mensaje de actualizaci\u00f3n BGP que contenga atributos EVPN espec\u00edficos. Para aprovechar esta vulnerabilidad, un atacante debe controlar un altavoz BGP que tenga una conexi\u00f3n peer confiable establecida con un dispositivo afectado que est\u00e9 configurado con la familia de direcciones L2VPN EVPN para recibir y procesar el mensaje de actualizaci\u00f3n. Esta vulnerabilidad no puede ser explotada por ning\u00fan dato que sea iniciado por clientes en la red de capa 2 o por pares que no est\u00e9n configurados para aceptar la familia de direcciones L2VPN EVPN. Una explotaci\u00f3n con \u00e9xito podr\u00eda permitir al atacante causar que el proceso BGP sea reiniciado inesperadamente, resultando en una condici\u00f3n de DoS. La implementaci\u00f3n de Cisco de BGP acepta las actualizaciones entrantes de BGP s\u00f3lo de los pares definidos expl\u00edcitamente. Para que esta vulnerabilidad pueda ser explotada, el mensaje de actualizaci\u00f3n BGP malicioso debe provenir de un peer BGP configurado y v\u00e1lido o ser inyectado por el atacante en la red BGP afectada en una conexi\u00f3n TCP existente y v\u00e1lida a un peer BGP"}], "lastModified": "2023-11-07T03:42:51.843", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "40797623-4116-4A1B-A8A1-3D08058786E5", "versionEndExcluding": "6.8.2"}, {"criteria": "cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E484E1FF-E289-47DB-B052-E252D44B597C", "versionEndExcluding": "7.3.2", "versionStartIncluding": "7.0"}, {"criteria": "cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A9385428-E8DF-447A-BA25-5BF79F8EC95F", "versionEndExcluding": "7.4.2", "versionStartIncluding": "7.4"}], "operator": "OR"}]}], "sourceIdentifier": "ykramarz@cisco.com"}