{
  "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 identity-based firewall (IDFW) rule processing feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass security protections.\r\n\r\nThis vulnerability is due to improper handling of network requests by affected devices configured to use object group search. An attacker could exploit this vulnerability by sending a specially crafted network request to an affected device. A successful exploit could allow the attacker to bypass access control list (ACL) rules on the device, bypass security protections, and send network traffic to unauthorized hosts.\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 October 2021 release of the Cisco ASA, FTD, and FMC Security Advisory Bundled publication. For a complete list of the advisories and links to them, see Cisco Event Response: October 2021 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication [\"https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74773\"].",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "At the time of publication, this vulnerability affected Cisco products if they were running a vulnerable release of Cisco ASA Software or FTD Software and had IDFW rules using object group search properties.\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.",
        "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 Firepower Management Center (FMC) Software.",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "Exploitation of this vulnerability could allow an attacker to bypass protections that are provided by an ACL that is applied on an affected device. The overall impact of exploitation is organization-specific because it depends on the importance of the assets that the ACL was supposed to protect. Customers should evaluate how exploitation of this vulnerability would impact their network and proceed according to their own vulnerability-handling and remediation processes.",
        "title": "Details"
      },
      {
        "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      Fixed Releases\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\r\nASA Software\r\n                                Cisco ASA Software Release              First Fixed Release for This Vulnerability                                              9.7 and earlier1              Migrate to a fixed release.                                  9.8              9.8.4.40                                  9.91              Migrate to a fixed release.                                  9.101              Migrate to a fixed release.                                  9.12              9.12.4.25                                  9.131              Migrate to a fixed release.                                  9.14              9.14.3.1                                  9.15              9.15.1.17                                  9.16              9.16.1.28\r\n1. Cisco ASA Software releases 9.7 and earlier as well as releases 9.9, 9.10, and 9.13 have reached end of software maintenance [\"https://www.cisco.com/c/en/us/products/eos-eol-listing.html\"]. Customers are advised to migrate to a supported release that includes the fix for this vulnerability.\r\nFTD Software\r\n                                Cisco FTD Software Release              First Fixed Release for This Vulnerability                                              6.3 and earlier1              Migrate to a fixed release.                                  6.4              6.4.0.13 (Nov 2021)                                  6.51              Migrate to a fixed release.                                  6.6              6.6.5                                  6.7              6.7.0.3 (Jan 2022)                                  7.0              7.0.1\r\n1. Cisco FMC and FTD Software releases 6.2.2 and earlier, as well as releases 6.3.0 and 6.5.0, have reached end of software maintenance [\"https://www.cisco.com/c/en/us/products/eos-eol-listing.html\"]. Customers are advised to migrate to a supported release that includes the fix for this vulnerability.\r\nFor instructions on upgrading your FTD device, see Cisco Firepower Management Center Upgrade Guide [\"https://www.cisco.com/c/en/us/td/docs/security/firepower/upgrade/fpmc-upgrade-guide/getting_started.html\"].\r\n\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 [\"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 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 Adaptive Security Appliance Software and Firepower Threat Defense Software Identity-Based Rule Bypass Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rule-bypass-ejjOgQEY"
      },
      {
        "category": "external",
        "summary": "Cisco Event Response: October 2021 Cisco ASA, FMC, and FTD Software Security Advisory Bundled Publication",
        "url": "https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-74773"
      },
      {
        "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": "end of software maintenance",
        "url": "https://www.cisco.com/c/en/us/products/eos-eol-listing.html"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Firepower Management Center Upgrade Guide",
        "url": "https://www.cisco.com/c/en/us/td/docs/security/firepower/upgrade/fpmc-upgrade-guide/getting_started.html"
      }
    ],
    "title": "Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Identity-Based Rule Bypass Vulnerability",
    "tracking": {
      "current_release_date": "2021-10-27T16:00:00+00:00",
      "generator": {
        "date": "2024-05-10T23:10:47+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-asaftd-rule-bypass-ejjOgQEY",
      "initial_release_date": "2021-10-27T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2021-10-27T15:39:31+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": "9.8.2.15",
                    "product": {
                      "name": "9.8.2.15",
                      "product_id": "CSAFPID-232898"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "9.8.3.8",
                    "product": {
                      "name": "9.8.3.8",
                      "product_id": "CSAFPID-248825"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "9.8.3.11",
                    "product": {
                      "name": "9.8.3.11",
                      "product_id": "CSAFPID-248826"
                    }
                  }
                ],
                "category": "product_version",
                "name": "9.8"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "9.12.4.18",
                    "product": {
                      "name": "9.12.4.18",
                      "product_id": "CSAFPID-282062"
                    }
                  }
                ],
                "category": "product_version",
                "name": "9.12"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "9.14.2.4",
                    "product": {
                      "name": "9.14.2.4",
                      "product_id": "CSAFPID-281572"
                    }
                  },
                  {
                    "category": "service_pack",
                    "name": "9.14.2.13",
                    "product": {
                      "name": "9.14.2.13",
                      "product_id": "CSAFPID-282018"
                    }
                  }
                ],
                "category": "product_version",
                "name": "9.14"
              },
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "9.15.1.16",
                    "product": {
                      "name": "9.15.1.16",
                      "product_id": "CSAFPID-283786"
                    }
                  }
                ],
                "category": "product_version",
                "name": "9.15"
              }
            ],
            "category": "product_family",
            "name": "Cisco Adaptive Security Appliance (ASA) Software"
          },
          {
            "category": "product_family",
            "name": "Cisco Firepower Threat Defense Software",
            "product": {
              "name": "Cisco Firepower Threat Defense Software ",
              "product_id": "CSAFPID-220203"
            }
          },
          {
            "category": "product_name",
            "name": "Cisco Firepower 2100 Series",
            "product": {
              "name": "Cisco Firepower 2100 Series",
              "product_id": "CSAFPID-277392"
            }
          },
          {
            "category": "product_name",
            "name": "Cisco ASA 5500-X Series Firewalls",
            "product": {
              "name": "Cisco ASA 5500-X Series Firewalls",
              "product_id": "CSAFPID-277437"
            }
          },
          {
            "category": "product_name",
            "name": "Cisco Firepower 9000 Series",
            "product": {
              "name": "Cisco Firepower 9000 Series",
              "product_id": "CSAFPID-277440"
            }
          },
          {
            "category": "product_name",
            "name": "Cisco Firepower 4100 Series",
            "product": {
              "name": "Cisco Firepower 4100 Series",
              "product_id": "CSAFPID-277441"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ],
    "relationships": [
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Adaptive Security Appliance (ASA) Software 9.8.2.15 when installed on Cisco Firepower 2100 Series",
          "product_id": "CSAFPID-232898:277392"
        },
        "product_reference": "CSAFPID-232898",
        "relates_to_product_reference": "CSAFPID-277392"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Adaptive Security Appliance (ASA) Software 9.8.3.8 when installed on Cisco ASA 5500-X Series Firewalls",
          "product_id": "CSAFPID-248825:277437"
        },
        "product_reference": "CSAFPID-248825",
        "relates_to_product_reference": "CSAFPID-277437"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Adaptive Security Appliance (ASA) Software 9.8.3.11 when installed on Cisco Firepower 9000 Series",
          "product_id": "CSAFPID-248826:277440"
        },
        "product_reference": "CSAFPID-248826",
        "relates_to_product_reference": "CSAFPID-277440"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Adaptive Security Appliance (ASA) Software 9.12.4.18 when installed on Cisco ASA 5500-X Series Firewalls",
          "product_id": "CSAFPID-282062:277437"
        },
        "product_reference": "CSAFPID-282062",
        "relates_to_product_reference": "CSAFPID-277437"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Adaptive Security Appliance (ASA) Software 9.14.2.4 when installed on Cisco Firepower 9000 Series",
          "product_id": "CSAFPID-281572:277440"
        },
        "product_reference": "CSAFPID-281572",
        "relates_to_product_reference": "CSAFPID-277440"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Adaptive Security Appliance (ASA) Software 9.14.2.13 when installed on Cisco ASA 5500-X Series Firewalls",
          "product_id": "CSAFPID-282018:277437"
        },
        "product_reference": "CSAFPID-282018",
        "relates_to_product_reference": "CSAFPID-277437"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "Cisco Adaptive Security Appliance (ASA) Software 9.15.1.16 when installed on Cisco Firepower 4100 Series",
          "product_id": "CSAFPID-283786:277441"
        },
        "product_reference": "CSAFPID-283786",
        "relates_to_product_reference": "CSAFPID-277441"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2021-34787",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvx47895"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-232898:277392",
          "CSAFPID-248825:277437",
          "CSAFPID-248826:277440",
          "CSAFPID-281572:277440",
          "CSAFPID-282018:277437",
          "CSAFPID-282062:277437",
          "CSAFPID-283786:277441",
          "CSAFPID-220203"
        ]
      },
      "release_date": "2021-10-27T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-220203",
            "CSAFPID-232898:277392",
            "CSAFPID-248825:277437",
            "CSAFPID-248826:277440",
            "CSAFPID-281572:277440",
            "CSAFPID-282018:277437",
            "CSAFPID-282062:277437",
            "CSAFPID-283786:277441"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-232898:277392",
            "CSAFPID-248825:277437",
            "CSAFPID-248826:277440",
            "CSAFPID-281572:277440",
            "CSAFPID-282018:277437",
            "CSAFPID-282062:277437",
            "CSAFPID-283786:277441",
            "CSAFPID-220203"
          ]
        }
      ],
      "title": "Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Identity-Based Rule Bypass Vulnerability"
    }
  ]
}