cve-2023-2828
Vulnerability from cvelistv5
Published
2023-06-21 16:26
Modified
2024-08-02 06:33
Summary
named's configured cache size limit can be significantly exceeded
Impacted products
ISCBIND 9
Show details on NVD website


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          "dateUpdated": "2024-08-02T06:33:05.796Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
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        "references": [
          {
            "name": "CVE-2023-2828",
            "tags": [
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            "url": "https://kb.isc.org/docs/cve-2023-2828"
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            "url": "http://www.openwall.com/lists/oss-security/2023/06/21/6"
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            "tags": [
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            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U3K6AJK7RRSR53HRF5GGKPA6PDUDWOD2/"
          },
          {
            "tags": [
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            "url": "https://www.debian.org/security/2023/dsa-5439"
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            "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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            ],
            "url": "https://lists.debian.org/debian-lts-announce/2023/07/msg00021.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "BIND 9",
          "vendor": "ISC",
          "versions": [
            {
              "lessThanOrEqual": "9.16.41",
              "status": "affected",
              "version": "9.11.0",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "9.18.15",
              "status": "affected",
              "version": "9.18.0",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "9.19.13",
              "status": "affected",
              "version": "9.19.0",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "9.16.41-S1",
              "status": "affected",
              "version": "9.11.3-S1",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "9.18.15-S1",
              "status": "affected",
              "version": "9.18.11-S1",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "ISC would like to thank Shoham Danino from Reichman University, Anat Bremler-Barr from Tel-Aviv University, Yehuda Afek from Tel-Aviv University, and Yuval Shavitt from Tel-Aviv University for bringing this vulnerability to our attention."
        }
      ],
      "datePublic": "2023-06-21T00:00:00Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Every `named` instance configured to run as a recursive resolver maintains a cache database holding the responses to the queries it has recently sent to authoritative servers. The size limit for that cache database can be configured using the `max-cache-size` statement in the configuration file; it defaults to 90% of the total amount of memory available on the host. When the size of the cache reaches 7/8 of the configured limit, a cache-cleaning algorithm starts to remove expired and/or least-recently used RRsets from the cache, to keep memory use below the configured limit.\n\nIt has been discovered that the effectiveness of the cache-cleaning algorithm used in `named` can be severely diminished by querying the resolver for specific RRsets in a certain order, effectively allowing the configured `max-cache-size` limit to be significantly exceeded.\nThis issue affects BIND 9 versions 9.11.0 through 9.16.41, 9.18.0 through 9.18.15, 9.19.0 through 9.19.13, 9.11.3-S1 through 9.16.41-S1, and 9.18.11-S1 through 9.18.15-S1."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "We are not aware of any active exploits."
        }
      ],
      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "By exploiting this flaw, an attacker can cause the amount of memory used by a `named` resolver to go well beyond the configured `max-cache-size` limit. The effectiveness of the attack depends on a number of factors (e.g. query load, query patterns), but since the default value of the `max-cache-size` statement is `90%`, in the worst case the attacker can exhaust all available memory on the host running `named`, leading to a denial-of-service condition."
            }
          ]
        }
      ],
      "metrics": [
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          "cvssV3_1": {
            "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": "2023-06-21T16:26:07.096Z",
        "orgId": "404fd4d2-a609-4245-b543-2c944a302a22",
        "shortName": "isc"
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      "references": [
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          "name": "CVE-2023-2828",
          "tags": [
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          "url": "https://kb.isc.org/docs/cve-2023-2828"
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          "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"
        },
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          "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SEFCEVCTYEMKTWA7V7EYPI5YQQ4JWDLI/"
        },
        {
          "url": "https://security.netapp.com/advisory/ntap-20230703-0010/"
        },
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          "url": "https://lists.debian.org/debian-lts-announce/2023/07/msg00021.html"
        }
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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, 9.19.14, 9.16.42-S1, or 9.18.16-S1."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "named\u0027s configured cache size limit can be significantly exceeded",
      "workarounds": [
        {
          "lang": "en",
          "value": "No workarounds known."
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    "assignerShortName": "isc",
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    "datePublished": "2023-06-21T16:26:07.096Z",
    "dateReserved": "2023-05-22T07:57:41.362Z",
    "dateUpdated": "2024-08-02T06:33:05.796Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1",
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  }
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
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  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.