CVE-2024-8508 (GCVE-0-2024-8508)

Vulnerability from cvelistv5 – Published: 2024-10-03 16:27 – Updated: 2024-11-14 21:02
VLAI
Title
Unbounded name compression could lead to Denial of Service
Summary
NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very large RRsets can cause Unbound to spend a considerable time applying name compression to downstream replies. This can lead to degraded performance and eventually denial of service in well orchestrated attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will try to apply name compression which was an unbounded operation that could lock the CPU until the whole packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression calculations it is willing to do per packet. Packets that need more compression will result in semi-compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long. This change should not affect normal DNS traffic.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-03 17:11 UTC
CWE
  • CWE-606 - Unchecked Input for Loop Condition
Assigner
References
Impacted products
Vendor Product Version CPE status
NLnet Labs Unbound Affected: 0 , ≤ 1.21.0 (semver)
guessed Create a notification for this product.
nlnetlabs unbound Affected: 0 , ≤ 1.21.0 (semver)
    cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2024-10-03 00:00
Credits
Toshifumi Sakaguchi
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "unbound",
            "vendor": "nlnetlabs",
            "versions": [
              {
                "lessThanOrEqual": "1.21.0",
                "status": "affected",
                "version": "0",
                "versionType": "semver"
              }
            ]
          }
        ],
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2024-8508",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-10-03T17:11:45.971377Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-10-03T17:15:19.533Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-11-14T21:02:40.473Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2024/10/04/5"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2024/11/msg00009.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Unbound",
          "vendor": "NLnet Labs",
          "versions": [
            {
              "lessThanOrEqual": "1.21.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Toshifumi Sakaguchi"
        }
      ],
      "datePublic": "2024-10-03T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very large RRsets can cause Unbound to spend a considerable time applying name compression to downstream replies. This can lead to degraded performance and eventually denial of service in well orchestrated attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will try to apply name compression which was an unbounded operation that could lock the CPU until the whole packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression calculations it is willing to do per packet. Packets that need more compression will result in semi-compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long. This change should not affect normal DNS traffic."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-606",
              "description": "CWE-606: Unchecked Input for Loop Condition",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-10-03T16:27:54.540Z",
        "orgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
        "shortName": "NLnet Labs"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2024-8508.txt"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "This issue is fixed in 1.21.1 and all later versions."
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2024-07-25T00:00:00.000Z",
          "value": "Issue reported by Toshifumi Sakaguchi"
        },
        {
          "lang": "en",
          "time": "2024-07-31T00:00:00.000Z",
          "value": "Issue acknowledged by NLnet Labs; mitigation shared with Toshifumi Sakaguchi"
        },
        {
          "lang": "en",
          "time": "2024-08-01T00:00:00.000Z",
          "value": "Mitigation confirmed by Toshifumi Sakaguchi"
        },
        {
          "lang": "en",
          "time": "2024-10-03T00:00:00.000Z",
          "value": "Fixes released with Unbound 1.21.1"
        }
      ],
      "title": "Unbounded name compression could lead to Denial of Service"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
    "assignerShortName": "NLnet Labs",
    "cveId": "CVE-2024-8508",
    "datePublished": "2024-10-03T16:27:54.540Z",
    "dateReserved": "2024-09-06T11:47:59.783Z",
    "dateUpdated": "2024-11-14T21:02:40.473Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2024-8508",
      "date": "2026-09-28",
      "epss": "0.00801",
      "percentile": "0.5486"
    },
    "fkie_nvd": {
      "configurations": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*",
                  "matchCriteriaId": "EF9D6A27-E1D7-4B7E-8C13-A321D4155316",
                  "versionEndExcluding": "1.21.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        },
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
                  "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very large RRsets can cause Unbound to spend a considerable time applying name compression to downstream replies. This can lead to degraded performance and eventually denial of service in well orchestrated attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will try to apply name compression which was an unbounded operation that could lock the CPU until the whole packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression calculations it is willing to do per packet. Packets that need more compression will result in semi-compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long. This change should not affect normal DNS traffic."
        },
        {
          "lang": "es",
          "value": "NLnet Labs Unbound hasta la versi\u00f3n 1.21.0 incluida contiene una vulnerabilidad gestionando respuestas con conjuntos de RR muy grandes para las que necesita realizar una compresi\u00f3n de nombres. Las respuestas maliciosas ascendentes con conjuntos de RR muy grandes pueden hacer que Unbound dedique un tiempo considerable a aplicar la compresi\u00f3n de nombres a las respuestas descendentes. Esto puede provocar un rendimiento degradado y, finalmente, la denegaci\u00f3n del servicio en ataques bien orquestados. La vulnerabilidad puede ser explotada por un actor malicioso que consulte a Unbound sobre el contenido especialmente manipulado de una zona maliciosa con conjuntos de RR muy grandes. Antes de que Unbound responda a la consulta, intentar\u00e1 aplicar la compresi\u00f3n de nombres, que era una operaci\u00f3n sin l\u00edmites que pod\u00eda bloquear la CPU hasta que se completara todo el paquete. La versi\u00f3n 1.21.1 de Unbound introduce un l\u00edmite estricto en la cantidad de c\u00e1lculos de compresi\u00f3n de nombres que est\u00e1 dispuesto a realizar por paquete. Los paquetes que necesitan m\u00e1s compresi\u00f3n dar\u00e1n como resultado paquetes semicomprimidos o paquetes truncados, incluso en TCP para mensajes grandes, para evitar bloquear la CPU durante mucho tiempo. Este cambio no deber\u00eda afectar el tr\u00e1fico DNS normal."
        }
      ],
      "id": "CVE-2024-8508",
      "lastModified": "2024-12-17T19:28:03.767",
      "metrics": {
        "cvssMetricV31": [
          {
            "cvssData": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "LOW",
              "baseScore": 5.3,
              "baseSeverity": "MEDIUM",
              "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:L",
              "version": "3.1"
            },
            "exploitabilityScore": 3.9,
            "impactScore": 1.4,
            "source": "sep@nlnetlabs.nl",
            "type": "Secondary"
          },
          {
            "cvssData": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "LOW",
              "baseScore": 5.3,
              "baseSeverity": "MEDIUM",
              "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:L",
              "version": "3.1"
            },
            "exploitabilityScore": 3.9,
            "impactScore": 1.4,
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      },
      "published": "2024-10-03T17:15:15.323",
      "references": [
        {
          "source": "sep@nlnetlabs.nl",
          "tags": [
            "Vendor Advisory"
          ],
          "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2024-8508.txt"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "Mailing List",
            "Third Party Advisory"
          ],
          "url": "http://www.openwall.com/lists/oss-security/2024/10/04/5"
        },
        {
          "source": "af854a3a-2127-422b-91ae-364da2661108",
          "tags": [
            "Mailing List",
            "Third Party Advisory"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2024/11/msg00009.html"
        }
      ],
      "sourceIdentifier": "sep@nlnetlabs.nl",
      "vulnStatus": "Analyzed",
      "weaknesses": [
        {
          "description": [
            {
              "lang": "en",
              "value": "CWE-606"
            }
          ],
          "source": "sep@nlnetlabs.nl",
          "type": "Secondary"
        },
        {
          "description": [
            {
              "lang": "en",
              "value": "CWE-1284"
            }
          ],
          "source": "nvd@nist.gov",
          "type": "Primary"
        }
      ]
    },
    "microsoft_vex": {
      "current_release_date": "2026-02-21T01:31:00.000Z",
      "cve": "CVE-2024-8508",
      "id": "msrc_CVE-2024-8508",
      "initial_release_date": "2024-10-01T07:00:00.000Z",
      "product_status:fixed": "2",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Unbounded name compression could lead to Denial of Service",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-8508.json",
      "version": "3"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "Unbound",
                "vendor": "NLnet Labs",
                "versions": [
                  {
                    "lessThanOrEqual": "1.21.0",
                    "status": "affected",
                    "version": "0",
                    "versionType": "semver"
                  }
                ]
              }
            ],
            "source": "sep@nlnetlabs.nl"
          },
          {
            "affectedData": [
              {
                "cpes": [
                  "cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*"
                ],
                "defaultStatus": "unknown",
                "product": "unbound",
                "vendor": "nlnetlabs",
                "versions": [
                  {
                    "lessThanOrEqual": "1.21.0",
                    "status": "affected",
                    "version": "0",
                    "versionType": "semver"
                  }
                ]
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "EF9D6A27-E1D7-4B7E-8C13-A321D4155316",
                    "versionEndExcluding": "1.21.1",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
                    "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very large RRsets can cause Unbound to spend a considerable time applying name compression to downstream replies. This can lead to degraded performance and eventually denial of service in well orchestrated attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will try to apply name compression which was an unbounded operation that could lock the CPU until the whole packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression calculations it is willing to do per packet. Packets that need more compression will result in semi-compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long. This change should not affect normal DNS traffic."
          },
          {
            "lang": "es",
            "value": "NLnet Labs Unbound hasta la versi\u00f3n 1.21.0 incluida contiene una vulnerabilidad gestionando respuestas con conjuntos de RR muy grandes para las que necesita realizar una compresi\u00f3n de nombres. Las respuestas maliciosas ascendentes con conjuntos de RR muy grandes pueden hacer que Unbound dedique un tiempo considerable a aplicar la compresi\u00f3n de nombres a las respuestas descendentes. Esto puede provocar un rendimiento degradado y, finalmente, la denegaci\u00f3n del servicio en ataques bien orquestados. La vulnerabilidad puede ser explotada por un actor malicioso que consulte a Unbound sobre el contenido especialmente manipulado de una zona maliciosa con conjuntos de RR muy grandes. Antes de que Unbound responda a la consulta, intentar\u00e1 aplicar la compresi\u00f3n de nombres, que era una operaci\u00f3n sin l\u00edmites que pod\u00eda bloquear la CPU hasta que se completara todo el paquete. La versi\u00f3n 1.21.1 de Unbound introduce un l\u00edmite estricto en la cantidad de c\u00e1lculos de compresi\u00f3n de nombres que est\u00e1 dispuesto a realizar por paquete. Los paquetes que necesitan m\u00e1s compresi\u00f3n dar\u00e1n como resultado paquetes semicomprimidos o paquetes truncados, incluso en TCP para mensajes grandes, para evitar bloquear la CPU durante mucho tiempo. Este cambio no deber\u00eda afectar el tr\u00e1fico DNS normal."
          }
        ],
        "id": "CVE-2024-8508",
        "lastModified": "2026-06-17T08:22:45.700",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "LOW",
                "baseScore": 5.3,
                "baseSeverity": "MEDIUM",
                "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:L",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 1.4,
              "source": "sep@nlnetlabs.nl",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "LOW",
                "baseScore": 5.3,
                "baseSeverity": "MEDIUM",
                "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:L",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 1.4,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2024-8508",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "yes"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-10-03T17:11:45.971377Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2024-10-03T17:15:15.323",
        "references": [
          {
            "source": "sep@nlnetlabs.nl",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2024-8508.txt"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "http://www.openwall.com/lists/oss-security/2024/10/04/5"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Mailing List",
              "Third Party Advisory"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2024/11/msg00009.html"
          }
        ],
        "sourceIdentifier": "sep@nlnetlabs.nl",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-606"
              }
            ],
            "source": "sep@nlnetlabs.nl",
            "type": "Secondary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-1284"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-25T18:37:36+00:00",
      "cve": "CVE-2024-8508",
      "id": "CVE-2024-8508",
      "initial_release_date": "2024-10-03T16:27:54.540000+00:00",
      "product_status:fixed": "301",
      "product_status:known_affected": "11",
      "product_status:known_not_affected": "157",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "unbound: Unbounded name compression could lead to Denial of Service",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-8508.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-29T02:01:04Z",
      "cve": "CVE-2024-8508",
      "id": "CVE-2024-8508",
      "initial_release_date": "2024-10-04T03:12:21Z",
      "product_status:known_affected": "127",
      "product_status:recommended": "100",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-8508",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-8508.json",
      "version": "35"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2024-11-14T21:02:40.473Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "url": "http://www.openwall.com/lists/oss-security/2024/10/04/5"
              },
              {
                "url": "https://lists.debian.org/debian-lts-announce/2024/11/msg00009.html"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "affected": [
              {
                "cpes": [
                  "cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:*"
                ],
                "defaultStatus": "unknown",
                "product": "unbound",
                "vendor": "nlnetlabs",
                "versions": [
                  {
                    "lessThanOrEqual": "1.21.0",
                    "status": "affected",
                    "version": "0",
                    "versionType": "semver"
                  }
                ]
              }
            ],
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2024-8508",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-10-03T17:11:45.971377Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-10-03T17:14:46.746Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "Unbound",
              "vendor": "NLnet Labs",
              "versions": [
                {
                  "lessThanOrEqual": "1.21.0",
                  "status": "affected",
                  "version": "0",
                  "versionType": "semver"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "Toshifumi Sakaguchi"
            }
          ],
          "datePublic": "2024-10-03T00:00:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "value": "NLnet Labs Unbound up to and including version 1.21.0 contains a vulnerability when handling replies with very large RRsets that it needs to perform name compression for. Malicious upstreams responses with very large RRsets can cause Unbound to spend a considerable time applying name compression to downstream replies. This can lead to degraded performance and eventually denial of service in well orchestrated attacks. The vulnerability can be exploited by a malicious actor querying Unbound for the specially crafted contents of a malicious zone with very large RRsets. Before Unbound replies to the query it will try to apply name compression which was an unbounded operation that could lock the CPU until the whole packet was complete. Unbound version 1.21.1 introduces a hard limit on the number of name compression calculations it is willing to do per packet. Packets that need more compression will result in semi-compressed packets or truncated packets, even on TCP for huge messages, to avoid locking the CPU for long. This change should not affect normal DNS traffic."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 5.3,
                "baseSeverity": "MEDIUM",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                "version": "3.1"
              },
              "format": "CVSS"
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-606",
                  "description": "CWE-606: Unchecked Input for Loop Condition",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2024-10-03T16:27:54.540Z",
            "orgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
            "shortName": "NLnet Labs"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2024-8508.txt"
            }
          ],
          "solutions": [
            {
              "lang": "en",
              "value": "This issue is fixed in 1.21.1 and all later versions."
            }
          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2024-07-25T00:00:00.000Z",
              "value": "Issue reported by Toshifumi Sakaguchi"
            },
            {
              "lang": "en",
              "time": "2024-07-31T00:00:00.000Z",
              "value": "Issue acknowledged by NLnet Labs; mitigation shared with Toshifumi Sakaguchi"
            },
            {
              "lang": "en",
              "time": "2024-08-01T00:00:00.000Z",
              "value": "Mitigation confirmed by Toshifumi Sakaguchi"
            },
            {
              "lang": "en",
              "time": "2024-10-03T00:00:00.000Z",
              "value": "Fixes released with Unbound 1.21.1"
            }
          ],
          "title": "Unbounded name compression could lead to Denial of Service"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
        "assignerShortName": "NLnet Labs",
        "cveId": "CVE-2024-8508",
        "datePublished": "2024-10-03T16:27:54.540Z",
        "dateReserved": "2024-09-06T11:47:59.783Z",
        "dateUpdated": "2024-11-14T21:02:40.473Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



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.