CVE-2023-2911
Vulnerability from cvelistv5
Published
2023-06-21 16:26
Modified
2024-08-02 06:41
Summary
Exceeding the recursive-clients quota may cause named to terminate unexpectedly when stale-answer-client-timeout is set to 0
Impacted products
ISCBIND 9
Show details on NVD website


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          "dateUpdated": "2024-08-02T06:41:03.760Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
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            "name": "CVE-2023-2911",
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            "url": "http://www.openwall.com/lists/oss-security/2023/06/21/6"
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            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U3K6AJK7RRSR53HRF5GGKPA6PDUDWOD2/"
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          {
            "tags": [
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            "url": "https://www.debian.org/security/2023/dsa-5439"
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            "url": "https://security.netapp.com/advisory/ntap-20230703-0010/"
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        "title": "CVE Program Container"
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    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "BIND 9",
          "vendor": "ISC",
          "versions": [
            {
              "lessThanOrEqual": "9.16.41",
              "status": "affected",
              "version": "9.16.33",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "9.18.15",
              "status": "affected",
              "version": "9.18.7",
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              "status": "affected",
              "version": "9.16.33-S1",
              "versionType": "custom"
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            {
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              "status": "affected",
              "version": "9.18.11-S1",
              "versionType": "custom"
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      ],
      "datePublic": "2023-06-21T00:00:00Z",
      "descriptions": [
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          "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."
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      "exploits": [
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          "lang": "en",
          "value": "This flaw was discovered in internal testing. We are not aware of any active exploits."
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      "impacts": [
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              "value": "By sending specific queries to the resolver, an attacker can cause `named` to terminate unexpectedly."
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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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        "dateUpdated": "2023-06-21T16:26:36.587Z",
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          "name": "CVE-2023-2911",
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          "url": "https://kb.isc.org/docs/cve-2023-2911"
        },
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        },
        {
          "url": "https://www.debian.org/security/2023/dsa-5439"
        },
        {
          "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SEFCEVCTYEMKTWA7V7EYPI5YQQ4JWDLI/"
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          "url": "https://security.netapp.com/advisory/ntap-20230703-0010/"
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      "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."
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      ],
      "source": {
        "discovery": "INTERNAL"
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      "title": "Exceeding the recursive-clients quota may cause named to terminate unexpectedly when stale-answer-client-timeout is set to 0",
      "workarounds": [
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          "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."
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      ]
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    "assignerShortName": "isc",
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    "datePublished": "2023-06-21T16:26:36.587Z",
    "dateReserved": "2023-05-26T11:20:45.872Z",
    "dateUpdated": "2024-08-02T06:41:03.760Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1",
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  }
}


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