{
   "CVE_data_meta" : {
      "ASSIGNER" : "security-officer@isc.org",
      "DATE_PUBLIC" : "2018-01-16T00:00:00.000Z",
      "ID" : "CVE-2017-3145",
      "STATE" : "PUBLIC",
      "TITLE" : "Improper fetch cleanup sequencing in the resolver can cause named to crash"
   },
   "affects" : {
      "vendor" : {
         "vendor_data" : [
            {
               "product" : {
                  "product_data" : [
                     {
                        "product_name" : "BIND 9",
                        "version" : {
                           "version_data" : [
                              {
                                 "version_value" : "9.0.0 to 9.8.x, 9.9.0 to 9.9.11, 9.10.0 to 9.10.6, 9.11.0 to 9.11.2, 9.9.3-S1 to 9.9.11-S1, 9.10.5-S1 to 9.10.6-S1, 9.12.0a1 to 9.12.0rc1"
                              }
                           ]
                        }
                     }
                  ]
               },
               "vendor_name" : "ISC"
            }
         ]
      }
   },
   "credit" : [
      {
         "lang" : "eng",
         "value" : "ISC would like to thank Jayachandran Palanisamy of Cygate AB for making us aware of this vulnerability."
      }
   ],
   "data_format" : "MITRE",
   "data_type" : "CVE",
   "data_version" : "4.0",
   "description" : {
      "description_data" : [
         {
            "lang" : "eng",
            "value" : "BIND was improperly sequencing cleanup operations on upstream recursion fetch contexts, leading in some cases to a use-after-free error that can trigger an assertion failure and crash in named. Affects BIND 9.0.0 to 9.8.x, 9.9.0 to 9.9.11, 9.10.0 to 9.10.6, 9.11.0 to 9.11.2, 9.9.3-S1 to 9.9.11-S1, 9.10.5-S1 to 9.10.6-S1, 9.12.0a1 to 9.12.0rc1."
         }
      ]
   },
   "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" : "While this bug has existed in BIND since 9.0.0, there are no known code paths leading to it in ISC releases prior to those containing the fix for CVE-2017-3137.  Thus while all instances of BIND ought to be patched, only ISC versions [9.9.9-P8 to 9.9.11, 9.10.4-P8 to 9.10.6, 9.11.0-P5 to 9.11.2, 9.9.9-S10 to 9.9.11-S1, 9.10.5-S1 to 9.10.6-S1, and 9.12.0a1 to 9.12.0rc1] acting as DNSSEC validating resolvers are currently known to crash due to this bug.  The known crash is an assertion failure in netaddr.c."
               }
            ]
         }
      ]
   },
   "references" : {
      "reference_data" : [
         {
            "name" : "https://kb.isc.org/docs/aa-01542",
            "refsource" : "CONFIRM",
            "url" : "https://kb.isc.org/docs/aa-01542"
         }
      ]
   },
   "solution" : [
      {
         "lang" : "eng",
         "value" : "Upgrade to the patched release most closely related to your current version of BIND.  These can all be downloaded from http://www.isc.org/downloads.\n\n    BIND 9 version 9.9.11-P1\n    BIND 9 version 9.10.6-P1\n    BIND 9 version 9.11.2-P1\n    BIND 9 version 9.12.0rc2\n\nBIND Supported Preview Edition is a special feature preview branch of BIND provided to eligible ISC support customers.\n\n    BIND 9 version 9.9.11-S2\n    BIND 9 version 9.10.6-S2"
      }
   ],
   "source" : {
      "discovery" : "UNKNOWN"
   },
   "work_around" : [
      {
         "lang" : "eng",
         "value" : "If an operator is experiencing crashes due to this, temporarily disabling DNSSEC validation can be used to avoid the known problematic code path while replacement builds are prepared."
      }
   ]
}