{
  "document": {
    "acknowledgments": [
      {
        "summary": "This vulnerability was found during internal security testing."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "title": "Summary",
        "text": "A vulnerability in Cisco NX-OS System Software could allow an authenticated, local attacker to bypass signature verification when loading a software patch.\r\n\r\nThe vulnerability is due to insufficient NX-OS signature verification for software patches. An authenticated, local attacker could exploit this vulnerability to bypass signature verification and load a crafted, unsigned software patch on a targeted device. The attacker would need valid administrator credentials to perform this exploit.\r\n\r\nThere are no workarounds that address this vulnerability.\r\n\r\n"
      },
      {
        "category": "general",
        "title": "Vulnerable Products",
        "text": "This vulnerability affects the following products running Cisco NX-OS System Software:\r\n\r\nMultilayer Director Switches\r\nNexus 7000 Series Switches\r\nNexus 7700 Series Switches\r\nUnified Computing System Manager\r\n  For information about affected releases, consult the Cisco bug ID(s) at the top of this advisory."
      },
      {
        "category": "general",
        "title": "Products Confirmed Not Vulnerable",
        "text": "No other Cisco products are currently known to be affected by this vulnerability.\r\n\r\nCisco has confirmed that this vulnerability does not affect the following products:\r\n\r\nFirepower 2100 Series\r\nFirepower 4100 Series Next-Generation Firewall\r\nFirepower 9300 Security Appliance\r\nNexus 1000V Series Switches\r\nNexus 2000 Series Fabric Extenders\r\nNexus 3000 Series Switches\r\nNexus 3500 Platform Switches\r\nNexus 5000 Series Switches\r\nNexus 5500 Platform Switches\r\nNexus 5600 Platform Switches\r\nNexus 6000 Series Switches\r\nNexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode\r\nNexus 9000 Series Switches in standalone NX-OS mode\r\nNexus 9500 R-Series Line Cards and Fabric Modules"
      },
      {
        "category": "general",
        "title": "Workarounds",
        "text": "There are no workarounds that address this vulnerability."
      },
      {
        "category": "general",
        "title": "Fixed Software",
        "text": "For information about fixed software releases, consult the Cisco bug ID(s) at the top of this advisory.\r\n\r\nWhen considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts 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."
      },
      {
        "category": "general",
        "title": "Vulnerability Policy",
        "text": "To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html\"]. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco."
      },
      {
        "category": "general",
        "title": "Exploitation and Public Announcements",
        "text": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
      },
      {
        "category": "general",
        "title": "Source",
        "text": "This vulnerability was found during internal security testing."
      },
      {
        "category": "legal_disclaimer",
        "title": "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."
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "psirt@cisco.com",
      "issuing_authority": "Cisco PSIRT",
      "name": "Cisco",
      "namespace": "https://wwww.cisco.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "Cisco NX-OS System Software Patch Signature Bypass Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171129-nxos"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      },
      {
        "category": "external",
        "summary": "Cisco Security Advisories and Alerts page",
        "url": "https://www.cisco.com/go/psirt"
      }
    ],
    "title": "Cisco NX-OS System Software Patch Signature Bypass Vulnerability",
    "tracking": {
      "current_release_date": "2017-11-29T16:00:00+00:00",
      "generator": {
        "date": "2024-03-28T20:27:34+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-20171129-nxos",
      "initial_release_date": "2017-11-29T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2017-11-28T18:36:52+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "name": "Cisco",
        "category": "vendor",
        "branches": [
          {
            "name": "Cisco NX-OS Software",
            "category": "product_family",
            "product": {
              "name": "Cisco NX-OS Software ",
              "product_id": "CSAFPID-80720"
            }
          }
        ]
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2017-12331",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvf16494"
        },
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvf23655"
        }
      ],
      "notes": [
        {
          "category": "other",
          "title": "Affected Product Comprehensiveness",
          "text": "Complete."
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-80720"
        ]
      },
      "release_date": "2017-11-29T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-80720"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.7,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.0"
          },
          "products": [
            "CSAFPID-80720"
          ]
        }
      ],
      "title": "Cisco NX-OS System Software Patch Signature Bypass Vulnerability"
    }
  ]
}