{
  "document": {
    "acknowledgments": [
      {
        "summary": "This vulnerability was found during internal security testing."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in the CLI console login authentication of Cisco Nexus 9300-FX3 Series Fabric Extender (FEX) when used in UCS Fabric Interconnect deployments could allow an unauthenticated attacker with physical access to bypass authentication.\r\n\r\nThis vulnerability is due to the improper implementation of the password validation function. An attacker could exploit this vulnerability by logging in to the console port on an affected device. A successful exploit could allow the attacker to bypass authentication and execute a limited set of commands local to the FEX, which could cause a device reboot and denial of service (DoS) condition.\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\r\n\r\n\r\n\r\nThis advisory is part of the February 2023 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: February 2023 Semiannual Cisco FXOS and NX-OS Software Security Advisory Bundled Publication [\"https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75057\"].",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "This vulnerability affects Cisco Nexus 9300-FX3 Series FEX when used with the following Cisco products if they are running a vulnerable release of Cisco UCS Software:\r\n\r\nUCS 6400 Series Fabric Interconnects\r\nUCS 6500 Series Fabric Interconnects\r\n\r\nOnly the following Cisco Nexus 9000 Series PIDs when configured in FEX mode are vulnerable:\r\n\r\nN9K-C93180YC-FX3\r\nN9K-C93180YC-FX3S\r\n\r\nNote: These PIDs are not vulnerable if they are used in FEX mode with a Cisco Nexus 9000 parent switch or if they are configured as a standalone Top of Rack (TOR) switch.\r\n\r\nFor information about which Cisco software releases were vulnerable at the time of publication, see the Fixed Software [\"#fs\"] section of this advisory. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.\r\n  Determine the Cisco Nexus 9000 Series PID\r\nTo verify the FEX PID in Intersight Management Mode (IMM), use the show fex command as shown in the following example:\r\n\r\n\r\nIMM:\r\n6500-FI# show fex\r\nFEX 23:\r\n   Name: FEX0023\r\n   Model: N9K-C93180YC-FX3\r\n  Serial: FDO250.....\r\nState: Online\r\n\r\n\r\nTo verify the FEX PID in UCSM Management Mode (UMM), use the show fex detail | grep PID command in the CLI as shown in the following example:\r\n\r\n\r\nUMM:\r\n6400-FI# show fex detail | grep PID\r\n    PID: N9K-C93180YC-FX3",
        "title": "Vulnerable Products"
      },
      {
        "category": "general",
        "text": "Only products listed in the Vulnerable Products [\"#vp\"] section of this advisory are known to be affected by this vulnerability.\r\n\r\nCisco has confirmed that this vulnerability does not affect the following Cisco products:\r\n\r\nFirepower 1000 Series\r\n\r\nFirepower 2100 Series\r\n\r\nFirepower 4100 Series\r\n\r\nFirepower 9300 Security Appliances\r\n\r\nMDS 9000 Series Multilayer Switches\r\n\r\nNexus 1000 Virtual Edge for VMware vSphere\r\n\r\nNexus 1000V Switch for Microsoft Hyper-V\r\n\r\nNexus 1000V Switch for VMware vSphere\r\n\r\nNexus 3000 Series Switches\r\n\r\nNexus 5500 Platform Switches\r\n\r\nNexus 5600 Platform Switches\r\n\r\nNexus 6000 Series Switches\r\n\r\nNexus 7000 Series Switches\r\nNexus 9000 Series Switches in standalone NX-OS mode\r\n\r\nSecure Firewall 3100 Series\r\n\r\nUCS 6200 Series Fabric Interconnects\r\n\r\nUCS 6300 Series Fabric Interconnects",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "There are no workarounds that address this vulnerability.",
        "title": "Workarounds"
      },
      {
        "category": "general",
        "text": "When considering software upgrades [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes\"], customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page [\"https://www.cisco.com/go/psirt\"], to determine exposure and a complete upgrade solution.\r\n\r\nIn all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.\r\n        Cisco UCS Software\r\nAt the time of publication, the release information in the following table(s) was accurate. See the Details section in the bug ID(s) at the top of this advisory for the most complete and current information.\r\n\r\nThe left column lists Cisco software releases, and the right column indicates whether a release was affected by the vulnerability described in this advisory and which release included the fix for this vulnerability.\r\n          Cisco UCS Software Release  First Fixed Release for This Vulnerability          4.0  Not vulnerable1      4.1  Not vulnerable1      4.2  4.2(2d)\r\n1. The Nexus 9300-FX3 Series FEX is supported only with Cisco UCS Software release 4.2(1d) and later.\r\nThe Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.",
        "title": "Fixed Software"
      },
      {
        "category": "general",
        "text": "To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy [\"http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html\"]. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.",
        "title": "Vulnerability Policy"
      },
      {
        "category": "general",
        "text": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.",
        "title": "Exploitation and Public Announcements"
      },
      {
        "category": "general",
        "text": "This vulnerability was found during internal security testing.",
        "title": "Source"
      },
      {
        "category": "legal_disclaimer",
        "text": "THIS DOCUMENT IS PROVIDED ON AN \"AS IS\" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.\r\n\r\nA standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. The information in this document is intended for end users of Cisco products.",
        "title": "Legal Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "psirt@cisco.com",
      "issuing_authority": "Cisco PSIRT",
      "name": "Cisco",
      "namespace": "https://wwww.cisco.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "Cisco Nexus 9300-FX3 Series Fabric Extender for UCS Fabric Interconnects Authentication Bypass Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-elyfex-dos-gfvcByx"
      },
      {
        "category": "external",
        "summary": "Cisco Event Response: February 2023 Semiannual Cisco FXOS and NX-OS Software Security Advisory Bundled Publication",
        "url": "https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75057"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      },
      {
        "category": "external",
        "summary": "considering software upgrades",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Security Advisories page",
        "url": "https://www.cisco.com/go/psirt"
      },
      {
        "category": "external",
        "summary": "Security Vulnerability Policy",
        "url": "http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html"
      }
    ],
    "title": "Cisco Nexus 9300-FX3 Series Fabric Extender for UCS Fabric Interconnects Authentication Bypass Vulnerability",
    "tracking": {
      "current_release_date": "2023-02-22T16:00:00+00:00",
      "generator": {
        "date": "2024-05-10T23:22:10+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-elyfex-dos-gfvcByx",
      "initial_release_date": "2023-02-22T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2023-02-22T15:50:30+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_family",
            "name": "Cisco Unified Computing System (Managed)",
            "product": {
              "name": "Cisco Unified Computing System (Managed) ",
              "product_id": "CSAFPID-112776"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2023-20012",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCwc52750"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-112776"
        ]
      },
      "release_date": "2023-02-22T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-112776"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-112776"
          ]
        }
      ],
      "title": "Cisco UCS Series Fabric Extender Authentication Bypass Vulnerability"
    }
  ]
}