{
  "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": "Update from October 22nd, 2020: Cisco has become aware of a new Cisco Adaptive Security Appliance vulnerability that could affect the fixed releases recommended for code trains 9.13 and 9.14 in the Fixed Software [\"#fs\"] section of this advisory. See the Cisco Adaptive Security Appliance Software SSL/TLS Denial of Service Vulnerability [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ssl-dos-7uZWwSEy\"] for additional information.\r\n\r\nA vulnerability in the Clientless SSL VPN (WebVPN) of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to inject arbitrary HTTP headers in the responses of the affected system.\r\n\r\nThe vulnerability is due to improper input sanitization. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to conduct a CRLF injection attack, adding arbitrary HTTP headers in the responses of the system and redirecting the user to arbitrary websites.\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\r\n\r\n",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "At the time of publication, this vulnerability affected Cisco products running Cisco ASA Software or FTD Software when configured for AnyConnect/WebVPN and the Load Balancing service was enabled.\r\n\r\nFor information about which Cisco ASA Software and FTD Software releases were vulnerable, see the Fixed Software [\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191002-asa-xss#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.\r\n  Determine If WebVPN Is Enabled\r\nTo determine if the WebVPN service is enabled on a device, use the show running-config webvpn privileged EXEC command and refer to the output of the command. The following example shows the output of the command for a device that has the WebVPN service enabled:\r\n\r\n\r\nciscoasa# show running-config webvpn\r\n.\r\n.\r\n.\r\nwebvpn\r\nenable interface_name\r\n.\r\n.\r\n.\r\n\r\nTo view AnyConnect-related configuration, use the show webvpn anyconnect command.\r\n  Determine If Load Balancing Is Enabled\r\nTo determine if the Load Balancing service is enabled on a device, see Viewing VPN Load Balancing Information [\"https://www.cisco.com/c/en/us/td/docs/security/asa/asa99/configuration/vpn/asa-99-vpn-config/vpn-ha.html#ID-2443-00000297\"].",
        "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": "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  Cisco ASA Software        Cisco ASA Software Release  First Fixed Release for This Vulnerability          Earlier than 9.61  Migrate to a fixed release.      9.61  9.6.4.35      9.71  9.8.4.20      9.8  9.8.4.20      9.9  9.9.2.80      9.10  9.10.1.43      9.12  9.12.3.9      9.13  9.13.1.10      9.14  9.14.1.10\r\n1. Cisco ASA Software releases 9.7 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  Cisco FTD Software        Cisco FTD Software Release  First Fixed Release for This Vulnerability          Earlier than 6.3.01  Migrate to a fixed release.      6.3.0  6.3.0.6 (future release)      6.4.0  6.4.0.10      6.5.0  6.5.0.5 (future release)      6.6.0  6.6.1\r\n1. Cisco FMC and FTD Software releases 6.0.1 and earlier, as well as releases 6.2.0 and 6.2.1, 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, 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 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 WebVPN CRLF Injection Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-crlf-inj-BX9uRwSn"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      },
      {
        "category": "external",
        "summary": "Cisco\u0026nbsp;Adaptive Security Appliance Software SSL/TLS Denial of Service Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ssl-dos-7uZWwSEy"
      },
      {
        "category": "external",
        "summary": "Fixed Software",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191002-asa-xss#fs"
      },
      {
        "category": "external",
        "summary": "Viewing VPN Load Balancing Information",
        "url": "https://www.cisco.com/c/en/us/td/docs/security/asa/asa99/configuration/vpn/asa-99-vpn-config/vpn-ha.html#ID-2443-00000297"
      },
      {
        "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"
      }
    ],
    "title": "Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software WebVPN CRLF Injection Vulnerability",
    "tracking": {
      "current_release_date": "2020-10-23T01:07:24+00:00",
      "generator": {
        "date": "2024-05-10T22:54:01+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-asa-ftd-crlf-inj-BX9uRwSn",
      "initial_release_date": "2020-10-21T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2020-10-10T12:59:59+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        },
        {
          "date": "2020-10-23T01:07:24+00:00",
          "number": "2.0.0",
          "summary": "Updated the Summary section to provide information on a new vulnerability affecting fixed release recommendations for code trains 9.13 and 9.14."
        }
      ],
      "status": "final",
      "version": "2.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "service_pack",
                    "name": "9.8.2.14",
                    "product": {
                      "name": "9.8.2.14",
                      "product_id": "CSAFPID-232897"
                    }
                  }
                ],
                "category": "product_version",
                "name": "9.8"
              }
            ],
            "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 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 9.8.2.14 when installed on Cisco Firepower 4100 Series",
          "product_id": "CSAFPID-232897:277441"
        },
        "product_reference": "CSAFPID-232897",
        "relates_to_product_reference": "CSAFPID-277441"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2020-3561",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCvt18028"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-232897:277441",
          "CSAFPID-220203"
        ]
      },
      "release_date": "2020-10-21T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-220203",
            "CSAFPID-232897:277441"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 4.7,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N",
            "version": "3.0"
          },
          "products": [
            "CSAFPID-232897:277441",
            "CSAFPID-220203"
          ]
        }
      ],
      "title": "Cisco Adaptive Security Appliance Software and Cisco Firepower Threat Defense Software WebVPN CRLF Injection Vulnerability"
    }
  ]
}