{
  "document": {
    "acknowledgments": [
      {
        "summary": "This vulnerability was found by Sanmith Prakash of Cisco during internal security testing."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in the generic routing encapsulation (GRE) tunnel decapsulation feature of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThe vulnerability is due to a memory handling error when GRE over IPv6 traffic is processed. An attacker could exploit this vulnerability by sending crafted GRE over IPv6 packets with either IPv4 or IPv6 payload through an affected device. A successful exploit could allow the attacker to cause the device to crash, resulting in a 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\nThis advisory is available at the following link:\r\nhttps://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-dos-2-sS2h7aWe [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-dos-2-sS2h7aWe\"]\r\n\r\nThis advisory is part of the May 2020 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication, which includes 12 Cisco Security Advisories that describe 12 vulnerabilities. For a complete list of the advisories and links to them, see Cisco Event Response: May 2020 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication [\"https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-73830\"].",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "This vulnerability affects Cisco FTD Software releases 6.3.0 and 6.4.0.\r\n\r\nNote: GRE tunnel decapsulation in the LINA engine was introduced in Cisco FTD Software Release 6.3.0. This feature is enabled by default and cannot be disabled.",
        "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 Adaptive Security Appliance (ASA) Software or Cisco Firepower Management Center (FMC) Software.",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "There are no workarounds that address this vulnerability.\r\n\r\nHowever, as a mitigation, customers can choose to bypass decapsulation for GRE-tunneled flows. To bypass decapsulation, do the following from the FMC GUI:\r\n\r\nClick Policies and choose Prefilter under Access Control.\r\nClick Edit under the Prefilter Policy that is associated with the access policy assigned to the device.\r\nChange the GRE tunnel rule type action to Fastpath.\r\nClick Save.\r\nClick Deploy.\r\n\r\nNote: This configuration will bypass the detection engine for GRE-tunneled traffic.",
        "title": "Workarounds"
      },
      {
        "category": "general",
        "text": "Cisco has released free software updates that address the vulnerability described in this advisory. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license: https://www.cisco.com/c/en/us/products/end-user-license-agreement.html [\"https://www.cisco.com/c/en/us/products/end-user-license-agreement.html\"]\r\n\r\nAdditionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades.\r\n\r\nWhen 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 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  Customers Without Service Contracts\r\nCustomers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html [\"https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html\"]\r\n\r\nCustomers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.\r\n      Fixed Releases\r\nIn the following table(s), the left column lists Cisco software releases. The center column indicates whether a release is affected by the vulnerability described in this advisory and the first release that includes the fix for this vulnerability. The right column indicates whether a release is affected by any of the vulnerabilities described in this bundle and which release includes fixes for those vulnerabilities.\r\n\r\nCisco FTD Software\r\n        Cisco FTD Software Release  First Fixed Release for This Vulnerability  First Fixed Release for All Vulnerabilities Described in the Bundle of Advisories          Earlier than 6.1.01  Not applicable.  Migrate to a fixed release.      6.1.0  Not applicable.  Migrate to a fixed release.      6.2.0  Not applicable.  Migrate to a fixed release.      6.2.1  Not applicable.  Migrate to a fixed release.      6.2.2  Not applicable.  Migrate to a fixed release.      6.2.3  Not applicable.  6.2.3.16 (June 2020)\r\nCisco_FTD_Hotfix_DT-6.2.3.16-3.sh.REL.tar\r\nCisco_FTD_SSP_FP2K_Hotfix_DT-6.2.3.16-3.sh.REL.tar\r\nCisco_FTD_SSP_Hotfix_DT-6.2.3.16-3.sh.REL.tar      6.3.0  6.3.0.5  6.3.0.6 (future release)\r\nCisco_FTD_Hotfix_AO-6.3.0.6-2.sh.REL.tar\r\nCisco_FTD_SSP_FP2K_Hotfix_ AO-6.3.0.6-2.sh.REL.tar\r\nCisco_FTD_SSP_Hotfix_ AO-6.3.0.6-2.sh.REL.tar      6.4.0  6.4.0.6  6.4.0.9      6.5.0  Not vulnerable.  6.5.0.5 (future release)\r\nCisco_FTD_Hotfix_H-6.5.0.5-2.sh.REL.tar and later\r\nCisco_FTD_SSP_FP1K_Hotfix_H-6.5.0.5-2.sh.REL.tar and later\r\nCisco_FTD_SSP_FP2K_Hotfix_H-6.5.0.5-2.sh.REL.tar and later\r\nCisco_FTD_SSP_Hotfix_H-6.5.0.5-2.sh.REL.tar and later      6.6.0  Not vulnerable.  6.6.0\r\n\r\n1. Cisco FMC and FTD Software releases 6.0.1 and earlier have reached end of software maintenance. Customers are advised to migrate to a supported release that includes the fix for this vulnerability.\r\n\r\nTo upgrade to a fixed release of Cisco FTD Software, customers can do one of the following:\r\n\r\nFor devices that are managed by using Cisco Firepower Management Center (FMC), use the FMC interface to install the upgrade. After installation is complete, reapply the access control policy.\r\nFor devices that are managed by using Cisco Firepower Device Manager (FDM), use the FDM interface to install the upgrade. After installation is complete, reapply the access control policy.",
        "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 by Sanmith Prakash of Cisco 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 Firepower Threat Defense Software Generic Routing Encapsulation Tunnel IPv6 Denial of Service Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-dos-2-sS2h7aWe"
      },
      {
        "category": "external",
        "summary": "Cisco Event Response: May 2020 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication",
        "url": "https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-73830"
      },
      {
        "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-ftd-dos-2-sS2h7aWe",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-dos-2-sS2h7aWe"
      },
      {
        "category": "external",
        "summary": "Cisco Event Response: May 2020 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication",
        "url": "https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-73830"
      },
      {
        "category": "external",
        "summary": "https://www.cisco.com/c/en/us/products/end-user-license-agreement.html",
        "url": "https://www.cisco.com/c/en/us/products/end-user-license-agreement.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 Security Advisories and Alerts page",
        "url": "https://www.cisco.com/go/psirt"
      },
      {
        "category": "external",
        "summary": "https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html",
        "url": "https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html"
      },
      {
        "category": "external",
        "summary": "Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      }
    ],
    "title": "Cisco Firepower Threat Defense Software Generic Routing Encapsulation Tunnel IPv6 Denial of Service Vulnerability",
    "tracking": {
      "current_release_date": "2020-06-02T21:15:25+00:00",
      "generator": {
        "date": "2022-10-22T03:03:14+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-ftd-dos-2-sS2h7aWe",
      "initial_release_date": "2020-05-06T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2020-05-05T16:34:59+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        },
        {
          "date": "2020-05-15T13:47:45+00:00",
          "number": "1.1.0",
          "summary": "Updated Hot Fixes for releases 6.4.0 and 6.5.0."
        },
        {
          "date": "2020-06-02T21:15:25+00:00",
          "number": "1.2.0",
          "summary": "Updated fixed release information for FTD Release 6.4.0."
        }
      ],
      "status": "final",
      "version": "1.2.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "6.3.0",
                    "product": {
                      "name": "6.3.0",
                      "product_id": "CSAFPID-251759"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "6.3.0.1",
                    "product": {
                      "name": "6.3.0.1",
                      "product_id": "CSAFPID-258065"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "6.3.0.2",
                    "product": {
                      "name": "6.3.0.2",
                      "product_id": "CSAFPID-258066"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "6.3.0.3",
                    "product": {
                      "name": "6.3.0.3",
                      "product_id": "CSAFPID-265012"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "6.3.0.4",
                    "product": {
                      "name": "6.3.0.4",
                      "product_id": "CSAFPID-268603"
                    }
                  }
                ],
                "category": "product_version",
                "name": "6.3"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "6.4.0",
                    "product": {
                      "name": "6.4.0",
                      "product_id": "CSAFPID-265014"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "6.4.0.1",
                    "product": {
                      "name": "6.4.0.1",
                      "product_id": "CSAFPID-265015"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "6.4.0.3",
                    "product": {
                      "name": "6.4.0.3",
                      "product_id": "CSAFPID-265950"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "6.4.0.2",
                    "product": {
                      "name": "6.4.0.2",
                      "product_id": "CSAFPID-268602"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "6.4.0.4",
                    "product": {
                      "name": "6.4.0.4",
                      "product_id": "CSAFPID-276372"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "6.4.0.5",
                    "product": {
                      "name": "6.4.0.5",
                      "product_id": "CSAFPID-276373"
                    }
                  }
                ],
                "category": "product_version",
                "name": "6.4"
              }
            ],
            "category": "product_family",
            "name": "Cisco Firepower Threat Defense Software"
          },
          {
            "category": "product_family",
            "name": "Cisco Firepower Threat Defense Software",
            "product": {
              "name": "Cisco Firepower Threat Defense Software ",
              "product_id": "CSAFPID-220203"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2020-3179",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvq78828"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-220203",
          "CSAFPID-251759",
          "CSAFPID-258065",
          "CSAFPID-258066",
          "CSAFPID-265012",
          "CSAFPID-265014",
          "CSAFPID-265015",
          "CSAFPID-265950",
          "CSAFPID-268602",
          "CSAFPID-268603",
          "CSAFPID-276372",
          "CSAFPID-276373"
        ]
      },
      "release_date": "2020-05-06T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-220203",
            "CSAFPID-251759",
            "CSAFPID-258065",
            "CSAFPID-258066",
            "CSAFPID-265012",
            "CSAFPID-265014",
            "CSAFPID-265015",
            "CSAFPID-265950",
            "CSAFPID-268602",
            "CSAFPID-268603",
            "CSAFPID-276372",
            "CSAFPID-276373"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.0"
          },
          "products": [
            "CSAFPID-220203",
            "CSAFPID-251759",
            "CSAFPID-258065",
            "CSAFPID-258066",
            "CSAFPID-265012",
            "CSAFPID-265014",
            "CSAFPID-265015",
            "CSAFPID-265950",
            "CSAFPID-268602",
            "CSAFPID-268603",
            "CSAFPID-276372",
            "CSAFPID-276373"
          ]
        }
      ],
      "title": "Cisco Firepower Threat Defense Denial of Service Vulnerability"
    }
  ]
}