Vulnerability-Lookup

CVE-2023-2911 (GCVE-0-2023-2911)

Vulnerability from cvelistv5 – Published: 2023-06-21 16:26 – Updated: 2025-02-13 16:49

Title

Exceeding the recursive-clients quota may cause named to terminate unexpectedly when stale-answer-client-timeout is set to 0

Summary

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. This 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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-12-06 18:32 UTC

Assigner

isc CNA under the mitre root

CNA scorecard A 95/100 over 33 records in the last 180 days details

References

6 references

URL	Tags
https://kb.isc.org/docs/cve-2023-2911	vendor-advisory
http://www.openwall.com/lists/oss-security/2023/06/21/6
https://lists.fedoraproject.org/archives/list/pac…
https://www.debian.org/security/2023/dsa-5439
https://lists.fedoraproject.org/archives/list/pac…
https://security.netapp.com/advisory/ntap-2023070…

Impacted products

1 product

Vendor	Product	Version	CPE status
ISC	BIND 9	Affected: 9.16.33 , ≤ 9.16.41 (custom) Affected: 9.18.7 , ≤ 9.18.15 (custom) Affected: 9.16.33-S1 , ≤ 9.16.41-S1 (custom) Affected: 9.18.11-S1 , ≤ 9.18.15-S1 (custom)	guessed

Date Public

2023-06-21 00:00

Show details on NVD website

JSON

To clipboard

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            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SEFCEVCTYEMKTWA7V7EYPI5YQQ4JWDLI/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U3K6AJK7RRSR53HRF5GGKPA6PDUDWOD2/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20230703-0010/"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://www.debian.org/security/2023/dsa-5439"
          }
        ],
        "sourceIdentifier": "security-officer@isc.org",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-787"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-06T20:25:52+00:00",
      "cve": "CVE-2023-2911",
      "id": "CVE-2023-2911",
      "initial_release_date": "2023-06-21T00:00:00+00:00",
      "product_status:known_not_affected": "68",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "bind: Exceeding the recursive-clients quota may cause named to terminate unexpectedly when stale-answer-client-timeout is set to 0",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-2911.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2024-08-02T06:41:03.760Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "name": "CVE-2023-2911",
                "tags": [
                  "vendor-advisory",
                  "x_transferred"
                ],
                "url": "https://kb.isc.org/docs/cve-2023-2911"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "http://www.openwall.com/lists/oss-security/2023/06/21/6"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U3K6AJK7RRSR53HRF5GGKPA6PDUDWOD2/"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://www.debian.org/security/2023/dsa-5439"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SEFCEVCTYEMKTWA7V7EYPI5YQQ4JWDLI/"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://security.netapp.com/advisory/ntap-20230703-0010/"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2023-2911",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-12-06T18:32:18.833805Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-12-06T18:32:22.652Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "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",
                  "versionType": "custom"
                },
                {
                  "lessThanOrEqual": "9.16.41-S1",
                  "status": "affected",
                  "version": "9.16.33-S1",
                  "versionType": "custom"
                },
                {
                  "lessThanOrEqual": "9.18.15-S1",
                  "status": "affected",
                  "version": "9.18.11-S1",
                  "versionType": "custom"
                }
              ]
            }
          ],
          "datePublic": "2023-06-21T00:00:00.000Z",
          "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."
            }
          ],
          "exploits": [
            {
              "lang": "en",
              "value": "This flaw was discovered in internal testing. We are not aware of any active exploits."
            }
          ],
          "impacts": [
            {
              "descriptions": [
                {
                  "lang": "en",
                  "value": "By sending specific queries to the resolver, an attacker can cause `named` to terminate unexpectedly."
                }
              ]
            }
          ],
          "metrics": [
            {
              "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"
              }
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2023-07-03T15:06:21.382Z",
            "orgId": "404fd4d2-a609-4245-b543-2c944a302a22",
            "shortName": "isc"
          },
          "references": [
            {
              "name": "CVE-2023-2911",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://kb.isc.org/docs/cve-2023-2911"
            },
            {
              "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/"
            }
          ],
          "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."
            }
          ],
          "source": {
            "discovery": "INTERNAL"
          },
          "title": "Exceeding the recursive-clients quota may cause named to terminate unexpectedly when stale-answer-client-timeout is set to 0",
          "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."
            }
          ]
        }
      },
      "cveMetadata": {
        "assignerOrgId": "404fd4d2-a609-4245-b543-2c944a302a22",
        "assignerShortName": "isc",
        "cveId": "CVE-2023-2911",
        "datePublished": "2023-06-21T16:26:36.587Z",
        "dateReserved": "2023-05-26T11:20:45.872Z",
        "dateUpdated": "2025-02-13T16:49:00.351Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}

UBUNTU-CVE-2023-2911 (CVE-2023-2911)

Vulnerability from osv_ubuntu – Published: 2023-06-21 00:00 – Updated: 2026-04-22 07:45 – Source website

Details

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. This 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.

Severity

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2023-2911	REPORT
	https://kb.isc.org/v1/docs/cve-2023-2911	REPORT
	https://ubuntu.com/security/notices/USN-6183-1	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2023-2911	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "bind9",
            "binary_version": "1:9.16.1-0ubuntu2.15"
          },
          {
            "binary_name": "bind9-dnsutils",
            "binary_version": "1:9.16.1-0ubuntu2.15"
          },
          {
            "binary_name": "bind9-host",
            "binary_version": "1:9.16.1-0ubuntu2.15"
          },
          {
            "binary_name": "bind9-libs",
            "binary_version": "1:9.16.1-0ubuntu2.15"
          },
          {
            "binary_name": "bind9-utils",
            "binary_version": "1:9.16.1-0ubuntu2.15"
          },
          {
            "binary_name": "bind9utils",
            "binary_version": "1:9.16.1-0ubuntu2.15"
          },
          {
            "binary_name": "dnsutils",
            "binary_version": "1:9.16.1-0ubuntu2.15"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "bind9",
        "purl": "pkg:deb/ubuntu/bind9@1:9.16.1-0ubuntu2.15?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.16.1-0ubuntu2.15"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:9.11.5.P4+dfsg-5.1ubuntu2",
        "1:9.11.5.P4+dfsg-5.1ubuntu3",
        "1:9.11.5.P4+dfsg-5.1ubuntu4",
        "1:9.11.5.P4+dfsg-5.1ubuntu5",
        "1:9.11.14+dfsg-1ubuntu1",
        "1:9.11.14+dfsg-3ubuntu1",
        "1:9.16.0-1ubuntu3",
        "1:9.16.0-1ubuntu4",
        "1:9.16.0-1ubuntu5",
        "1:9.16.1-0ubuntu1",
        "1:9.16.1-0ubuntu2",
        "1:9.16.1-0ubuntu2.1",
        "1:9.16.1-0ubuntu2.2",
        "1:9.16.1-0ubuntu2.3",
        "1:9.16.1-0ubuntu2.4",
        "1:9.16.1-0ubuntu2.6",
        "1:9.16.1-0ubuntu2.7",
        "1:9.16.1-0ubuntu2.8",
        "1:9.16.1-0ubuntu2.9",
        "1:9.16.1-0ubuntu2.10",
        "1:9.16.1-0ubuntu2.11",
        "1:9.16.1-0ubuntu2.12",
        "1:9.16.1-0ubuntu2.14"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "bind9",
            "binary_version": "1:9.18.12-0ubuntu0.22.04.2"
          },
          {
            "binary_name": "bind9-dnsutils",
            "binary_version": "1:9.18.12-0ubuntu0.22.04.2"
          },
          {
            "binary_name": "bind9-host",
            "binary_version": "1:9.18.12-0ubuntu0.22.04.2"
          },
          {
            "binary_name": "bind9-libs",
            "binary_version": "1:9.18.12-0ubuntu0.22.04.2"
          },
          {
            "binary_name": "bind9-utils",
            "binary_version": "1:9.18.12-0ubuntu0.22.04.2"
          },
          {
            "binary_name": "bind9utils",
            "binary_version": "1:9.18.12-0ubuntu0.22.04.2"
          },
          {
            "binary_name": "dnsutils",
            "binary_version": "1:9.18.12-0ubuntu0.22.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "bind9",
        "purl": "pkg:deb/ubuntu/bind9@1:9.18.12-0ubuntu0.22.04.2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:9.18.12-0ubuntu0.22.04.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:9.16.15-1ubuntu1",
        "1:9.16.15-1ubuntu2",
        "1:9.16.15-1ubuntu3",
        "1:9.18.0-2ubuntu1",
        "1:9.18.0-2ubuntu2",
        "1:9.18.0-2ubuntu3",
        "1:9.18.1-1ubuntu1",
        "1:9.18.1-1ubuntu1.1",
        "1:9.18.1-1ubuntu1.2",
        "1:9.18.1-1ubuntu1.3",
        "1:9.18.12-0ubuntu0.22.04.1"
      ]
    }
  ],
  "aliases": [],
  "details": "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. This 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.",
  "id": "UBUNTU-CVE-2023-2911",
  "modified": "2026-04-22T07:45:00Z",
  "published": "2023-06-21T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-2911"
    },
    {
      "type": "REPORT",
      "url": "https://kb.isc.org/v1/docs/cve-2023-2911"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-6183-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-2911"
    }
  ],
  "related": [
    "USN-6183-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2023-2911"
  ]
}

WID-SEC-W-2023-1533

Vulnerability from csaf_certbund - Published: 2023-06-21 22:00 - Updated: 2026-01-06 23:00

Summary

Internet Systems Consortium BIND: Mehrere Schwachstellen ermöglichen Denial of Service

Severity

Mittel

Scope

3 vulnerabilities in this advisory, including CVE-2023-2911.

CVE-2023-2911

Known affected: 18 products

Open the full advisory

WID-SEC-W-2023-2917

Vulnerability from csaf_certbund - Published: 2023-11-14 23:00 - Updated: 2025-09-03 22:00

Summary

Xerox FreeFlow Print Server: Mehrere Schwachstellen

Severity

Hoch

Scope

135 vulnerabilities in this advisory, including CVE-2023-2911.

CVE-2023-2911

Known affected: 7 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2023-2911 (GCVE-0-2023-2911)

UBUNTU-CVE-2023-2911 (CVE-2023-2911)

WID-SEC-W-2023-1533

WID-SEC-W-2023-2917

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