{
  "document": {
    "acknowledgments": [
      {
        "summary": "This vulnerability was found during the resolution of a Cisco TAC support case."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in the access control logic of the Secure Shell (SSH) server of Cisco IOS and IOS XE Software may allow connections sourced from a virtual routing and forwarding (VRF) instance despite the absence of the vrf-also keyword in the access-class configuration.\r\n\r\nThe vulnerability is due to a missing check in the SSH server. An attacker could use this vulnerability to open an SSH connection to an affected  Cisco IOS or IOS XE device with a source address belonging to a VRF instance. Once connected, the attacker would still need to provide valid credentials to access the device.\r\n\r\n\r\nThere are no workarounds that address this vulnerability.\r\n\r\n",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "This vulnerability affects Cisco IOS and Cisco IOS XE Software. For information about which software releases are vulnerable, see the Fixed Software [\"#fs\"] section of this advisory.",
        "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\nDetermining the Cisco IOS Software Release\r\nTo determine which Cisco IOS 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 Software, the system banner displays text similar to Cisco Internetwork Operating System Software or Cisco IOS Software. The banner also displays the installed image name in parentheses, followed by the Cisco IOS Software release number and release name. Some Cisco devices do not support the show version command or may provide different output.\r\n\r\nThe following example shows the output of the command for a device that is running Cisco IOS Software Release 15.5(2)T1 and has an installed image name of C2951-UNIVERSALK9-M:\r\n\r\n\r\nRouter\u003e show version\r\n  Cisco IOS Software, C2951 Software (C2951-UNIVERSALK9-M), Version 15.5(2)T1, RELEASE SOFTWARE (fc1)  Technical Support: http://www.cisco.com/techsupport  Copyright (c) 1986-2015 by Cisco Systems, Inc.  Compiled Mon 22-Jun-15 09:32 by prod_rel_team  .  .  .\r\n\r\nFor information about the naming and numbering conventions for Cisco IOS 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\"].\r\n\r\n\r\nDetermining 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": "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\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 the resolution of a Cisco TAC support case.",
        "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 IOS and IOS XE Software Secure Shell Connection on VRF Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190109-ios-ssh-vrf"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      },
      {
        "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"
      }
    ],
    "title": "Cisco IOS and IOS XE Software Secure Shell Connection on VRF Vulnerability",
    "tracking": {
      "current_release_date": "2019-01-09T16:00:00+00:00",
      "generator": {
        "date": "2024-05-10T22:46:10+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-20190109-ios-ssh-vrf",
      "initial_release_date": "2019-01-09T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2019-01-09T15:58:20+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": "12.2(60)EZ12",
                    "product": {
                      "name": "12.2(60)EZ12",
                      "product_id": "CSAFPID-228941"
                    }
                  }
                ],
                "category": "product_version",
                "name": "12.2EZ"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "15.7(3)M3",
                    "product": {
                      "name": "15.7(3)M3",
                      "product_id": "CSAFPID-231509"
                    }
                  }
                ],
                "category": "product_version",
                "name": "15.7M"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "15.8(3)M",
                    "product": {
                      "name": "15.8(3)M",
                      "product_id": "CSAFPID-240653"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "15.8(3)M0a",
                    "product": {
                      "name": "15.8(3)M0a",
                      "product_id": "CSAFPID-245741"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "15.8(3)M0b",
                    "product": {
                      "name": "15.8(3)M0b",
                      "product_id": "CSAFPID-247679"
                    }
                  }
                ],
                "category": "product_version",
                "name": "15.8M"
              }
            ],
            "category": "product_family",
            "name": "IOS"
          },
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "16.6.3",
                    "product": {
                      "name": "16.6.3",
                      "product_id": "CSAFPID-231682"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.6.4",
                    "product": {
                      "name": "16.6.4",
                      "product_id": "CSAFPID-233155"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.6.4s",
                    "product": {
                      "name": "16.6.4s",
                      "product_id": "CSAFPID-244900"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "16.6.4a",
                    "product": {
                      "name": "16.6.4a",
                      "product_id": "CSAFPID-247629"
                    }
                  }
                ],
                "category": "product_version",
                "name": "16.6"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "17.12.4",
                    "product": {
                      "name": "17.12.4",
                      "product_id": "CSAFPID-301716"
                    }
                  }
                ],
                "category": "product_version",
                "name": "17.12"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "17.15.1",
                    "product": {
                      "name": "17.15.1",
                      "product_id": "CSAFPID-300938"
                    }
                  }
                ],
                "category": "product_version",
                "name": "17.15"
              }
            ],
            "category": "product_family",
            "name": "Cisco IOS XE Software"
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2018-0484",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvk37852"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-228941",
          "CSAFPID-231509",
          "CSAFPID-240653",
          "CSAFPID-245741",
          "CSAFPID-247679",
          "CSAFPID-231682",
          "CSAFPID-233155",
          "CSAFPID-244900",
          "CSAFPID-247629",
          "CSAFPID-300938",
          "CSAFPID-301716"
        ]
      },
      "release_date": "2019-01-09T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-231682",
            "CSAFPID-233155",
            "CSAFPID-244900",
            "CSAFPID-247629",
            "CSAFPID-300938",
            "CSAFPID-301716",
            "CSAFPID-228941",
            "CSAFPID-231509",
            "CSAFPID-240653",
            "CSAFPID-245741",
            "CSAFPID-247679"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.0"
          },
          "products": [
            "CSAFPID-228941",
            "CSAFPID-231509",
            "CSAFPID-240653",
            "CSAFPID-245741",
            "CSAFPID-247679",
            "CSAFPID-231682",
            "CSAFPID-233155",
            "CSAFPID-244900",
            "CSAFPID-247629",
            "CSAFPID-300938",
            "CSAFPID-301716"
          ]
        }
      ],
      "title": "Cisco IOS and IOS XE Software Secure Shell Connection on VRF Vulnerability"
    }
  ]
}