{"dataType": "CVE_RECORD", "dataVersion": "5.0", "cveMetadata": {"cveId": "CVE-2023-2829", "assignerOrgId": "404fd4d2-a609-4245-b543-2c944a302a22", "state": "PUBLISHED", "assignerShortName": "isc", "dateReserved": "2023-05-22T07:57:43.061Z", "datePublished": "2023-06-21T16:26:24.932Z", "dateUpdated": "2023-06-21T16:26:24.932Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "404fd4d2-a609-4245-b543-2c944a302a22", "shortName": "isc", "dateUpdated": "2023-06-21T16:26:24.932Z"}, "title": "Malformed NSEC records can cause named to terminate unexpectedly when synth-from-dnssec is enabled", "datePublic": "2023-06-21T00:00:00Z", "affected": [{"vendor": "ISC", "product": "BIND 9", "versions": [{"version": "9.16.8-S1", "lessThanOrEqual": "9.16.41-S1", "status": "affected", "versionType": "custom"}, {"version": "9.18.11-S1", "lessThanOrEqual": "9.18.15-S1", "status": "affected", "versionType": "custom"}], "defaultStatus": "unaffected"}], "metrics": [{"cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}}], "descriptions": [{"lang": "en", "value": "A `named` instance configured to run as a DNSSEC-validating recursive resolver with the Aggressive Use of DNSSEC-Validated Cache (RFC 8198) option (`synth-from-dnssec`) enabled can be remotely terminated using a zone with a malformed NSEC record.\nThis issue affects BIND 9 versions 9.16.8-S1 through 9.16.41-S1 and 9.18.11-S1 through 9.18.15-S1."}], "impacts": [{"descriptions": [{"lang": "en", "value": "By sending specific queries to the resolver, an attacker can cause `named` to terminate unexpectedly.\n\nNote that the BIND configuration option `synth-from-dnssec` is enabled by default in all versions of BIND 9.18 and 9.18-S and newer. In earlier versions of BIND that had this option available, it was disabled unless activated explicitly in `named.conf`."}]}], "workarounds": [{"lang": "en", "value": "Setting `synth-from-dnssec` to `no` prevents the problem."}], "exploits": [{"lang": "en", "value": "We are not aware of any active exploits."}], "solutions": [{"lang": "en", "value": "Upgrade to the patched release most closely related to your current version of BIND 9: 9.16.42-S1 or 9.18.16-S1."}], "credits": [{"lang": "en", "value": "ISC would like to thank Greg Kuechle from SaskTel for bringing this vulnerability to our attention."}], "references": [{"url": "https://kb.isc.org/docs/cve-2023-2829", "name": "CVE-2023-2829", "tags": ["vendor-advisory"]}, {"url": "https://security.netapp.com/advisory/ntap-20230703-0010/"}], "source": {"discovery": "EXTERNAL"}}}}

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