{"dataType": "CVE_RECORD", "dataVersion": "5.0", "cveMetadata": {"cveId": "CVE-2023-2911", "assignerOrgId": "404fd4d2-a609-4245-b543-2c944a302a22", "state": "PUBLISHED", "assignerShortName": "isc", "dateReserved": "2023-05-26T11:20:45.872Z", "datePublished": "2023-06-21T16:26:36.587Z", "dateUpdated": "2023-06-21T16:26:36.587Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "404fd4d2-a609-4245-b543-2c944a302a22", "shortName": "isc", "dateUpdated": "2023-06-21T16:26:36.587Z"}, "title": "Exceeding the recursive-clients quota may cause named to terminate unexpectedly when stale-answer-client-timeout is set to 0", "datePublic": "2023-06-21T00:00:00Z", "affected": [{"vendor": "ISC", "product": "BIND 9", "versions": [{"version": "9.16.33", "lessThanOrEqual": "9.16.41", "status": "affected", "versionType": "custom"}, {"version": "9.18.7", "lessThanOrEqual": "9.18.15", "status": "affected", "versionType": "custom"}, {"version": "9.16.33-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": "If the `recursive-clients` quota is reached on a BIND 9 resolver configured with both `stale-answer-enable yes;` and `stale-answer-client-timeout 0;`, a sequence of serve-stale-related lookups could cause `named` to loop and terminate unexpectedly due to a stack overflow.\nThis issue affects BIND 9 versions 9.16.33 through 9.16.41, 9.18.7 through 9.18.15, 9.16.33-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."}]}], "workarounds": [{"lang": "en", "value": "Setting `stale-answer-client-timeout` to `off` or to a non-zero value prevents the issue.\n\nUsers of versions 9.18.10, 9.16.36, 9.16.36-S1 or older who are unable to upgrade should set `stale-answer-client-timeout` to `off`; using a non-zero value with these older versions leaves `named` vulnerable to CVE-2022-3924.\n\nAlthough it is possible to set the `recursive-clients` limit to a high number to reduce the likelihood of this scenario, this is not recommended; the limit on `recursive-clients` is important for preventing exhaustion of server resources. The limit cannot be disabled entirely."}], "exploits": [{"lang": "en", "value": "This flaw was discovered in internal testing. 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, 9.18.16, 9.16.42-S1, or 9.18.16-S1."}], "references": [{"url": "https://kb.isc.org/docs/cve-2023-2911", "name": "CVE-2023-2911", "tags": ["vendor-advisory"]}, {"url": "http://www.openwall.com/lists/oss-security/2023/06/21/6"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U3K6AJK7RRSR53HRF5GGKPA6PDUDWOD2/"}, {"url": "https://www.debian.org/security/2023/dsa-5439"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SEFCEVCTYEMKTWA7V7EYPI5YQQ4JWDLI/"}, {"url": "https://security.netapp.com/advisory/ntap-20230703-0010/"}], "source": {"discovery": "INTERNAL"}}}}

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