fkie_cve-2019-1977
Vulnerability from fkie_nvd
Published
2019-08-30 09:15
Modified
2024-11-21 04:37
Severity ?
6.8 (Medium) - CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
7.5 (High) - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
A vulnerability within the Endpoint Learning feature of Cisco Nexus 9000 Series Switches running in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an endpoint device in certain circumstances. The vulnerability is due to improper endpoint learning when packets are received on a specific port from outside the ACI fabric and destined to an endpoint located on a border leaf when Disable Remote Endpoint Learning has been enabled. This can result in a Remote (XR) entry being created for the impacted endpoint that will become stale if the endpoint migrates to a different port or leaf switch. This results in traffic not reaching the impacted endpoint until the Remote entry can be relearned by another mechanism.
References
psirt@cisco.comhttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nexus-aci-dosVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190828-nexus-aci-dosVendor Advisory
Impacted products
Vendor Product Version
cisco nx-os 12.3\(1h\)
cisco nx-os 13.1\(2m\)
cisco nx-os 13.1\(2o\)
cisco nx-os 13.1\(2p\)
cisco nexus_9000 -
cisco nexus_93108tc-ex -
cisco nexus_93108tc-fx -
cisco nexus_93120tx -
cisco nexus_93128tx -
cisco nexus_93180lc-ex -
cisco nexus_93180yc-ex -
cisco nexus_93180yc-fx -
cisco nexus_9332pq -
cisco nexus_9336c-fx2 -
cisco nexus_9336pq -
cisco nexus_9348gc-fxp -
cisco nexus_9364c -
cisco nexus_9372px -
cisco nexus_9372px-e -
cisco nexus_9372tx -
cisco nexus_9372tx-e -
cisco nexus_9396px -
cisco nexus_9396tx -
cisco nexus_9504 -
cisco nexus_9508 -
cisco nexus_9516 -


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability within the Endpoint Learning feature of Cisco Nexus 9000 Series Switches running in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an endpoint device in certain circumstances. The vulnerability is due to improper endpoint learning when packets are received on a specific port from outside the ACI fabric and destined to an endpoint located on a border leaf when Disable Remote Endpoint Learning has been enabled. This can result in a Remote (XR) entry being created for the impacted endpoint that will become stale if the endpoint migrates to a different port or leaf switch. This results in traffic not reaching the impacted endpoint until the Remote entry can be relearned by another mechanism."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad dentro de la funcionalidad Endpoint Learning de Cisco Nexus 9000 Series Switches ejecut\u00e1ndose en el modo Application Centric Infrastructure (ACI), podr\u00eda permitir a un atacante remoto no autenticado causar una condici\u00f3n de denegaci\u00f3n de servicio (DoS) en dispositivo endpoint en determinadas circunstancias. La vulnerabilidad es debido al aprendizaje inapropiado del endpoint cuando los paquetes son recibidos en un puerto espec\u00edfico desde fuera de la estructura ACI y se destinan hacia un endpoint ubicado en el borde de una bifurcaci\u00f3n cuando se ha habilitado Disable Remote Endpoint Learning. Esto puede resultar en que se cree una entrada Remote (XR) para el endpoint afectado que se volver\u00e1 obsoleta si el endpoint migra a un puerto o switch de bifurcaci\u00f3n. Esto resulta en un tr\u00e1fico que no alcanza el endpoint afectado hasta que la entrada remota pueda ser reaprendida por otro mecanismo."
    }
  ],
  "id": "CVE-2019-1977",
  "lastModified": "2024-11-21T04:37:48.753",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 4.3,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
          "version": "2.0"
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        "exploitabilityScore": 8.6,
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        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
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        "type": "Primary",
        "userInteractionRequired": false
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          "baseScore": 6.8,
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          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H",
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        "source": "psirt@cisco.com",
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          "attackVector": "NETWORK",
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          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
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  "published": "2019-08-30T09:15:20.553",
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      "source": "psirt@cisco.com",
      "tags": [
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  "sourceIdentifier": "psirt@cisco.com",
  "vulnStatus": "Modified",
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}


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