{
  "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 Image Verification feature of Cisco IOS XE Software could allow an authenticated, local attacker to install a malicious software image or file on an affected device.\r\n\r\nThe vulnerability is due to the affected software improperly verifying digital signatures for software images and files that are uploaded to a device. An attacker could exploit this vulnerability by uploading a malicious software image or file to an affected device. A successful exploit could allow the attacker to bypass digital signature verification checks for software images and files and install a malicious software image or file on the affected device.\r\n\r\nThere are no workarounds that address this vulnerability.\r\n\r\nThis advisory is available at the following link:\r\nhttps://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-digsig [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-digsig\"]",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "This vulnerability affects Cisco devices that are running a vulnerable release of Cisco IOS XE Software.\r\n\r\nFor information about which Cisco IOS XE Software releases are vulnerable, see the Fixed Software [\"#fs\"] section of this advisory.\r\n  Determining the Cisco IOS XE Software Release\r\nTo determine which Cisco IOS XE Software release is running on a device, administrators can log in to the device, use the show version command in the CLI, and then refer to the system banner that appears. If the device is running Cisco IOS XE Software, the system banner displays Cisco IOS Software, Cisco IOS XE Software, or similar text.\r\n\r\nThe following example shows the output of the command for a device that is running Cisco IOS XE Software Release 16.2.1 and has an installed image name of CAT3K_CAA-UNIVERSALK9-M:\r\n\r\n\r\nios-xe-device# show version\r\n  Cisco IOS Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version Denali 16.2.1, RELEASE SOFTWARE (fc1)  Technical Support: http://www.cisco.com/techsupport  Copyright (c) 1986-2016 by Cisco Systems, Inc.  Compiled Sun 27-Mar-16 21:47 by mcpre  .  .  .\r\n\r\nFor information about the naming and numbering conventions for Cisco IOS XE Software releases, see the Cisco IOS and NX-OS Software Reference Guide [\"https://www.cisco.com/c/en/us/about/security-center/ios-nx-os-reference-guide.html\"].",
        "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 Cisco IOS Software, Cisco IOS XR Software, or Cisco NX-OS Software.",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "There are no workarounds that address this vulnerability.",
        "title": "Workarounds"
      },
      {
        "category": "general",
        "text": "For detailed information about affected and fixed software releases, consult the Cisco IOS Software Checker.\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.\r\n                        Cisco IOS and IOS XE Software\r\nTo help customers determine their exposure to vulnerabilities in Cisco IOS and IOS XE Software, Cisco provides a tool, the Cisco IOS Software Checker [\"https://sec.cloudapps.cisco.com/security/center/softwarechecker.x\"], that identifies any Cisco Security Advisories that impact a specific software release and the earliest release that fixes the vulnerabilities described in each advisory (\u201cFirst Fixed\u201d). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories identified (\u201cCombined First Fixed\u201d).\r\n\r\nCustomers can use this tool to perform the following tasks:\r\n\r\nInitiate a search by choosing one or more releases from a drop-down list or uploading a file from a local system for the tool to parse\r\nEnter the output of the show version command for the tool to parse\r\nCreate a custom search by including all previously published Cisco Security Advisories, a specific advisory, or all advisories in the most recent bundled publication\r\n\r\nTo determine whether a release is affected by any published Cisco Security Advisory, use the Cisco IOS Software Checker [\"https://sec.cloudapps.cisco.com/security/center/softwarechecker.x\"] on Cisco.com or enter a Cisco IOS Software or Cisco IOS XE Software release\u2014for example, 15.1(4)M2 or 3.13.8S\u2014in the following field:\r\n\r\n\r\n\r\nBy default, the Cisco IOS Software Checker includes results only for vulnerabilities that have a Critical or High Security Impact Rating (SIR). To include results for Medium SIR vulnerabilities, use the Cisco IOS Software Checker on Cisco.com and check the Medium check box in the Impact Rating drop-down list.",
        "title": "Fixed Software"
      },
      {
        "category": "general",
        "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.",
        "title": "Vulnerability Policy"
      },
      {
        "category": "general",
        "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.",
        "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": "Emergency Support:\r\n+1 877 228 7302 (toll-free within North America)\r\n+1 408 525 6532 (International direct-dial)\r\nNon-emergency Support:\r\nEmail: psirt@cisco.com\r\nSupport requests that are received via e-mail are typically acknowledged within 48 hours.",
      "issuing_authority": "Cisco product security incident response is the responsibility of the Cisco Product Security Incident Response Team (PSIRT). The Cisco PSIRT is a dedicated, global team that manages the receipt, investigation, and public reporting of security vulnerability information that is related to Cisco products and networks. The on-call Cisco PSIRT works 24x7 with Cisco customers, independent security researchers, consultants, industry organizations, and other vendors to identify possible security issues with Cisco products and networks.\r\nMore information can be found in Cisco Security Vulnerability Policy available at https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html",
      "name": "Cisco",
      "namespace": "https://wwww.cisco.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "Cisco IOS XE Software Digital Signature Verification Bypass Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-digsig"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      },
      {
        "category": "external",
        "summary": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-digsig",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-digsig"
      },
      {
        "category": "external",
        "summary": "Cisco IOS and NX-OS Software Reference Guide",
        "url": "https://www.cisco.com/c/en/us/about/security-center/ios-nx-os-reference-guide.html"
      },
      {
        "category": "external",
        "summary": "Cisco Security Advisories and Alerts page",
        "url": "https://www.cisco.com/go/psirt"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;IOS Software Checker",
        "url": "https://sec.cloudapps.cisco.com/security/center/softwarechecker.x"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;IOS Software Checker",
        "url": "https://sec.cloudapps.cisco.com/security/center/softwarechecker.x"
      },
      {
        "category": "external",
        "summary": "Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      }
    ],
    "title": "Cisco IOS XE Software Digital Signature Verification Bypass Vulnerability",
    "tracking": {
      "current_release_date": "2018-09-26T16:00:00+00:00",
      "generator": {
        "date": "2022-09-03T03:40:52+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-20180926-digsig",
      "initial_release_date": "2018-09-26T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2018-09-26T14:20:23+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "16.1.1",
                    "product": {
                      "name": "16.1.1",
                      "product_id": "CSAFPID-212436"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.1.2",
                    "product": {
                      "name": "16.1.2",
                      "product_id": "CSAFPID-213100"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.1.3",
                    "product": {
                      "name": "16.1.3",
                      "product_id": "CSAFPID-214993"
                    }
                  }
                ],
                "category": "product_version",
                "name": "16.1"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "16.2.1",
                    "product": {
                      "name": "16.2.1",
                      "product_id": "CSAFPID-213809"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.2.2",
                    "product": {
                      "name": "16.2.2",
                      "product_id": "CSAFPID-217253"
                    }
                  }
                ],
                "category": "product_version",
                "name": "16.2"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "16.3.1",
                    "product": {
                      "name": "16.3.1",
                      "product_id": "CSAFPID-213960"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.3.2",
                    "product": {
                      "name": "16.3.2",
                      "product_id": "CSAFPID-217255"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.3.3",
                    "product": {
                      "name": "16.3.3",
                      "product_id": "CSAFPID-217256"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.3.1a",
                    "product": {
                      "name": "16.3.1a",
                      "product_id": "CSAFPID-220802"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.3.4",
                    "product": {
                      "name": "16.3.4",
                      "product_id": "CSAFPID-222711"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.3.5",
                    "product": {
                      "name": "16.3.5",
                      "product_id": "CSAFPID-229124"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.3.5b",
                    "product": {
                      "name": "16.3.5b",
                      "product_id": "CSAFPID-231187"
                    }
                  }
                ],
                "category": "product_version",
                "name": "16.3"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "16.4.1",
                    "product": {
                      "name": "16.4.1",
                      "product_id": "CSAFPID-214051"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.4.2",
                    "product": {
                      "name": "16.4.2",
                      "product_id": "CSAFPID-217257"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.4.3",
                    "product": {
                      "name": "16.4.3",
                      "product_id": "CSAFPID-231390"
                    }
                  }
                ],
                "category": "product_version",
                "name": "16.4"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "16.5.1",
                    "product": {
                      "name": "16.5.1",
                      "product_id": "CSAFPID-217259"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.5.1a",
                    "product": {
                      "name": "16.5.1a",
                      "product_id": "CSAFPID-225784"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.5.1b",
                    "product": {
                      "name": "16.5.1b",
                      "product_id": "CSAFPID-226330"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.5.2",
                    "product": {
                      "name": "16.5.2",
                      "product_id": "CSAFPID-229187"
                    }
                  }
                ],
                "category": "product_version",
                "name": "16.5"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "16.6.1",
                    "product": {
                      "name": "16.6.1",
                      "product_id": "CSAFPID-218901"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.6.2",
                    "product": {
                      "name": "16.6.2",
                      "product_id": "CSAFPID-228706"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.6.3",
                    "product": {
                      "name": "16.6.3",
                      "product_id": "CSAFPID-231682"
                    }
                  }
                ],
                "category": "product_version",
                "name": "16.6"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "16.7.1",
                    "product": {
                      "name": "16.7.1",
                      "product_id": "CSAFPID-218903"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.7.1a",
                    "product": {
                      "name": "16.7.1a",
                      "product_id": "CSAFPID-231389"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.7.1b",
                    "product": {
                      "name": "16.7.1b",
                      "product_id": "CSAFPID-232767"
                    }
                  }
                ],
                "category": "product_version",
                "name": "16.7"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "17.11.99SW",
                    "product": {
                      "name": "17.11.99SW",
                      "product_id": "CSAFPID-296860"
                    }
                  }
                ],
                "category": "product_version",
                "name": "17.11SW"
              }
            ],
            "category": "product_family",
            "name": "Cisco IOS XE Software"
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2018-15374",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvh15737"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-212436",
          "CSAFPID-213100",
          "CSAFPID-213809",
          "CSAFPID-213960",
          "CSAFPID-214051",
          "CSAFPID-214993",
          "CSAFPID-217253",
          "CSAFPID-217255",
          "CSAFPID-217256",
          "CSAFPID-217257",
          "CSAFPID-217259",
          "CSAFPID-218901",
          "CSAFPID-218903",
          "CSAFPID-220802",
          "CSAFPID-222711",
          "CSAFPID-225784",
          "CSAFPID-226330",
          "CSAFPID-228706",
          "CSAFPID-229124",
          "CSAFPID-229187",
          "CSAFPID-231187",
          "CSAFPID-231389",
          "CSAFPID-231390",
          "CSAFPID-231682",
          "CSAFPID-232767",
          "CSAFPID-296860"
        ]
      },
      "release_date": "2018-09-26T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-212436",
            "CSAFPID-213100",
            "CSAFPID-213809",
            "CSAFPID-213960",
            "CSAFPID-214051",
            "CSAFPID-214993",
            "CSAFPID-217253",
            "CSAFPID-217255",
            "CSAFPID-217256",
            "CSAFPID-217257",
            "CSAFPID-217259",
            "CSAFPID-218901",
            "CSAFPID-218903",
            "CSAFPID-220802",
            "CSAFPID-222711",
            "CSAFPID-225784",
            "CSAFPID-226330",
            "CSAFPID-228706",
            "CSAFPID-229124",
            "CSAFPID-229187",
            "CSAFPID-231187",
            "CSAFPID-231389",
            "CSAFPID-231390",
            "CSAFPID-231682",
            "CSAFPID-232767",
            "CSAFPID-296860"
          ],
          "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-212436",
            "CSAFPID-213100",
            "CSAFPID-213809",
            "CSAFPID-213960",
            "CSAFPID-214051",
            "CSAFPID-214993",
            "CSAFPID-217253",
            "CSAFPID-217255",
            "CSAFPID-217256",
            "CSAFPID-217257",
            "CSAFPID-217259",
            "CSAFPID-218901",
            "CSAFPID-218903",
            "CSAFPID-220802",
            "CSAFPID-222711",
            "CSAFPID-225784",
            "CSAFPID-226330",
            "CSAFPID-228706",
            "CSAFPID-229124",
            "CSAFPID-229187",
            "CSAFPID-231187",
            "CSAFPID-231389",
            "CSAFPID-231390",
            "CSAFPID-231682",
            "CSAFPID-232767",
            "CSAFPID-296860"
          ]
        }
      ],
      "title": "Cisco IOS XE Software Digital Signature Verification Bypass Vulnerability"
    }
  ]
}