{"id":"CVE-2018-5740","state":"PUBLISHED","title":"A flaw in the \"deny-answer-aliases\" feature can cause an assertion failure in named","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->9.8.8, 9.9.0->9.9.13, 9.10.0->9.10.8, 9.11.0->9.11.4, 9.12.0->9.12.2, 9.13.0->9.13.2.","publishedAt":"2019-01-16T20:00:00.000Z","updatedAt":"2024-09-16T17:58:43.029Z","severity":{"score":7.5,"label":"High","version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"isc"},"assigner":"isc","products":["ISC BIND 9"],"affected":[{"vendor":"ISC","product":"BIND 9","versions":[{"version":"BIND 9  9.7.0->9.8.8, 9.9.0->9.9.13, 9.10.0->9.10.8, 9.11.0->9.11.4, 9.12.0->9.12.2, 9.13.0->9.13.2","status":"affected"}]}],"references":["http://www.securityfocus.com/bid/105055","https://lists.debian.org/debian-lts-announce/2018/08/msg00033.html","https://access.redhat.com/errata/RHSA-2018:2570","https://access.redhat.com/errata/RHSA-2018:2571","https://usn.ubuntu.com/3769-2/","http://www.securitytracker.com/id/1041436","https://security.netapp.com/advisory/ntap-20180926-0003/","https://kb.isc.org/docs/aa-01639","https://usn.ubuntu.com/3769-1/","https://security.gentoo.org/glsa/201903-13","http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00027.html","http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00026.html","https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03927en_us","https://lists.debian.org/debian-lts-announce/2021/11/msg00001.html"],"weaknesses":[],"ingestedAt":"2026-10-29T19:44:56.034Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2018/5xxx/CVE-2018-5740.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2018-5740","state":"PUBLISHED","datePublished":"2019-01-16T20:00:00.000Z","dateUpdated":"2024-09-16T17:58:43.029Z","assignerShortName":"isc","assignerOrgId":"404fd4d2-a609-4245-b543-2c944a302a22","dateReserved":"2018-01-17T00:00:00.000Z"},"containers":{"cna":{"title":"A flaw in the \"deny-answer-aliases\" feature can cause an assertion failure in named","descriptions":[{"lang":"en","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->9.8.8, 9.9.0->9.9.13, 9.10.0->9.10.8, 9.11.0->9.11.4, 9.12.0->9.12.2, 9.13.0->9.13.2."}],"affected":[{"vendor":"ISC","product":"BIND 9","versions":[{"version":"BIND 9  9.7.0->9.8.8, 9.9.0->9.9.13, 9.10.0->9.10.8, 9.11.0->9.11.4, 9.12.0->9.12.2, 9.13.0->9.13.2","status":"affected"}]}],"references":[{"url":"http://www.securityfocus.com/bid/105055","name":"105055","tags":["vdb-entry","x_refsource_BID"]},{"url":"https://lists.debian.org/debian-lts-announce/2018/08/msg00033.html","name":"[debian-lts-announce] 20180830 [SECURITY] [DLA 1485-1] bind9 security update","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://access.redhat.com/errata/RHSA-2018:2570","name":"RHSA-2018:2570","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2018:2571","name":"RHSA-2018:2571","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://usn.ubuntu.com/3769-2/","name":"USN-3769-2","tags":["vendor-advisory","x_refsource_UBUNTU"]},{"url":"http://www.securitytracker.com/id/1041436","name":"1041436","tags":["vdb-entry","x_refsource_SECTRACK"]},{"url":"https://security.netapp.com/advisory/ntap-20180926-0003/","tags":["x_refsource_CONFIRM"]},{"url":"https://kb.isc.org/docs/aa-01639","tags":["x_refsource_CONFIRM"]},{"url":"https://usn.ubuntu.com/3769-1/","name":"USN-3769-1","tags":["vendor-advisory","x_refsource_UBUNTU"]},{"url":"https://security.gentoo.org/glsa/201903-13","name":"GLSA-201903-13","tags":["vendor-advisory","x_refsource_GENTOO"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00027.html","name":"openSUSE-SU-2019:1533","tags":["vendor-advisory","x_refsource_SUSE"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00026.html","name":"openSUSE-SU-2019:1532","tags":["vendor-advisory","x_refsource_SUSE"]},{"url":"https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03927en_us","tags":["x_refsource_CONFIRM"]},{"url":"https://lists.debian.org/debian-lts-announce/2021/11/msg00001.html","name":"[debian-lts-announce] 20211102 [SECURITY] [DLA 2807-1] bind9 security update","tags":["mailing-list","x_refsource_MLIST"]}],"metrics":[{"cvssV3_0":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.0"}}],"problemTypes":[{"descriptions":[{"description":"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.","lang":"en","type":"text"},{"description":"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.","lang":"en","type":"text"}]}],"providerMetadata":{"shortName":"isc","dateUpdated":"2021-11-02T03:06:16.000Z","orgId":"404fd4d2-a609-4245-b543-2c944a302a22"},"configurations":[{"lang":"en","value":"Only servers which have explicitly enabled the \"deny-answer-aliases\" feature are at risk and disabling the feature prevents exploitation."}],"credits":[{"lang":"en","value":"ISC would like to thank Tony Finch of the University of Cambridge for reporting this issue."}],"datePublic":"2018-08-08T00:00:00.000Z","solutions":[{"lang":"en","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"}],"source":{"discovery":"EXTERNAL"},"workarounds":[{"lang":"en","value":"This vulnerability can be avoided by disabling the \"deny-answer-aliases\" feature if it is in use."}],"x_legacyV4Record":{"CVE_data_meta":{"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->9.8.8, 9.9.0->9.9.13, 9.10.0->9.10.8, 9.11.0->9.11.4, 9.12.0->9.12.2, 9.13.0->9.13.2"}]}}]},"vendor_name":"ISC"}]}},"configuration":[{"lang":"en","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","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","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->9.8.8, 9.9.0->9.9.13, 9.10.0->9.10.8, 9.11.0->9.11.4, 9.12.0->9.12.2, 9.13.0->9.13.2."}]},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.0"}},"problemtype":{"problemtype_data":[{"description":[{"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."},{"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.  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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"}],"source":{"discovery":"EXTERNAL"},"work_around":[{"lang":"en","value":"This vulnerability can be avoided by disabling the \"deny-answer-aliases\" feature if it is in use."}]}},"adp":[{"title":"CVE Program Container","references":[{"url":"http://www.securityfocus.com/bid/105055","name":"105055","tags":["vdb-entry","x_refsource_BID","x_transferred"]},{"url":"https://lists.debian.org/debian-lts-announce/2018/08/msg00033.html","name":"[debian-lts-announce] 20180830 [SECURITY] [DLA 1485-1] bind9 security update","tags":["mailing-list","x_refsource_MLIST","x_transferred"]},{"url":"https://access.redhat.com/errata/RHSA-2018:2570","name":"RHSA-2018:2570","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred"]},{"url":"https://access.redhat.com/errata/RHSA-2018:2571","name":"RHSA-2018:2571","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred"]},{"url":"https://usn.ubuntu.com/3769-2/","name":"USN-3769-2","tags":["vendor-advisory","x_refsource_UBUNTU","x_transferred"]},{"url":"http://www.securitytracker.com/id/1041436","name":"1041436","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred"]},{"url":"https://security.netapp.com/advisory/ntap-20180926-0003/","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://kb.isc.org/docs/aa-01639","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://usn.ubuntu.com/3769-1/","name":"USN-3769-1","tags":["vendor-advisory","x_refsource_UBUNTU","x_transferred"]},{"url":"https://security.gentoo.org/glsa/201903-13","name":"GLSA-201903-13","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00027.html","name":"openSUSE-SU-2019:1533","tags":["vendor-advisory","x_refsource_SUSE","x_transferred"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00026.html","name":"openSUSE-SU-2019:1532","tags":["vendor-advisory","x_refsource_SUSE","x_transferred"]},{"url":"https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03927en_us","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://lists.debian.org/debian-lts-announce/2021/11/msg00001.html","name":"[debian-lts-announce] 20211102 [SECURITY] [DLA 2807-1] bind9 security update","tags":["mailing-list","x_refsource_MLIST","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-05T05:40:51.365Z"}}]}}}