{
  "GSD": {
    "alias": "CVE-2018-5740",
    "description": "\"deny-answer-aliases\" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is in use, to experience an assertion failure in name.c. Affects BIND 9.7.0-\u003e9.8.8, 9.9.0-\u003e9.9.13, 9.10.0-\u003e9.10.8, 9.11.0-\u003e9.11.4, 9.12.0-\u003e9.12.2, 9.13.0-\u003e9.13.2.",
    "id": "GSD-2018-5740",
    "references": [
      "https://www.suse.com/security/cve/CVE-2018-5740.html",
      "https://access.redhat.com/errata/RHSA-2018:2571",
      "https://access.redhat.com/errata/RHSA-2018:2570",
      "https://ubuntu.com/security/CVE-2018-5740",
      "https://advisories.mageia.org/CVE-2018-5740.html",
      "https://alas.aws.amazon.com/cve/html/CVE-2018-5740.html",
      "https://linux.oracle.com/cve/CVE-2018-5740.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2018-5740"
      ],
      "details": "\"deny-answer-aliases\" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is in use, to experience an assertion failure in name.c. Affects BIND 9.7.0-\u003e9.8.8, 9.9.0-\u003e9.9.13, 9.10.0-\u003e9.10.8, 9.11.0-\u003e9.11.4, 9.12.0-\u003e9.12.2, 9.13.0-\u003e9.13.2.",
      "id": "GSD-2018-5740",
      "modified": "2023-12-13T01:22:40.551563Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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        "ASSIGNER": "security-officer@isc.org",
        "DATE_PUBLIC": "2018-08-08T08:00:00.000Z",
        "ID": "CVE-2018-5740",
        "STATE": "PUBLIC",
        "TITLE": "A flaw in the \"deny-answer-aliases\" feature can cause an assertion failure in named"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "BIND 9",
                    "version": {
                      "version_data": [
                        {
                          "version_name": "BIND 9 ",
                          "version_value": "9.7.0-\u003e9.8.8, 9.9.0-\u003e9.9.13, 9.10.0-\u003e9.10.8, 9.11.0-\u003e9.11.4, 9.12.0-\u003e9.12.2, 9.13.0-\u003e9.13.2"
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      "configuration": [
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          "lang": "eng",
          "value": "Only servers which have explicitly enabled the \"deny-answer-aliases\" feature are at risk and disabling the feature prevents exploitation."
        }
      ],
      "credit": [
        {
          "lang": "eng",
          "value": "ISC would like to thank Tony Finch of the University of Cambridge for reporting this issue."
        }
      ],
      "data_format": "MITRE",
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      "data_version": "4.0",
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            "value": "\"deny-answer-aliases\" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is in use, to experience an assertion failure in name.c. Affects BIND 9.7.0-\u003e9.8.8, 9.9.0-\u003e9.9.13, 9.10.0-\u003e9.10.8, 9.11.0-\u003e9.11.4, 9.12.0-\u003e9.12.2, 9.13.0-\u003e9.13.2."
          }
        ]
      },
      "impact": {
        "cvss": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
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              },
              {
                "lang": "eng",
                "value": "Accidental or deliberate triggering of this defect will cause a REQUIRE assertion failure in named, causing the named process to stop execution and resulting in denial of service to clients.  Only servers which have explicitly enabled the \"deny-answer-aliases\" feature are at risk and disabling the feature prevents exploitation."
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            "refsource": "CONFIRM",
            "url": "https://security.netapp.com/advisory/ntap-20180926-0003/"
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          {
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            "url": "https://kb.isc.org/docs/aa-01639"
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          {
            "name": "USN-3769-1",
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            "url": "https://usn.ubuntu.com/3769-1/"
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          {
            "name": "GLSA-201903-13",
            "refsource": "GENTOO",
            "url": "https://security.gentoo.org/glsa/201903-13"
          },
          {
            "name": "openSUSE-SU-2019:1533",
            "refsource": "SUSE",
            "url": "http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00027.html"
          },
          {
            "name": "openSUSE-SU-2019:1532",
            "refsource": "SUSE",
            "url": "http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00026.html"
          },
          {
            "name": "https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US\u0026docId=emr_na-hpesbux03927en_us",
            "refsource": "CONFIRM",
            "url": "https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US\u0026docId=emr_na-hpesbux03927en_us"
          },
          {
            "name": "[debian-lts-announce] 20211102 [SECURITY] [DLA 2807-1] bind9 security update",
            "refsource": "MLIST",
            "url": "https://lists.debian.org/debian-lts-announce/2021/11/msg00001.html"
          }
        ]
      },
      "solution": [
        {
          "lang": "eng",
          "value": "Most operators will not need to make any changes unless they are using the \"deny-answer-aliases\" feature (which is described in the BIND 9 Adminstrator Reference Manual section 6.2.)  \"deny-answer-aliases\" is off by default; only configurations which explicitly enable it can be affected by this defect.\n\nIf you are using \"deny-answer-aliases\", upgrade to the patched release most closely related to your current version of BIND.\n\n    9.9.13-P1\n    9.10.8-P1\n    9.11.4-P1\n    9.12.2-P1\n\nBIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers.\n\n    9.11.3-S3\n"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "work_around": [
        {
          "lang": "eng",
          "value": "This vulnerability can be avoided by disabling the \"deny-answer-aliases\" feature if it is in use."
        }
      ]
    },
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            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
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            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
            "version": "2.0"
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          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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          "exploitabilityScore": 3.9,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2022-04-12T18:34Z",
      "publishedDate": "2019-01-16T20:29Z"
    }
  }
}