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CVE-2023-4809

Estado: ModificadaAlta (7.5)—

In pf packet processing with a 'scrub fragment reassemble' rule, a packet containing multiple IPv6 fragment headers would be reassembled, and then immediately processed. That is, a packet with multiple fragment extension headers would not be recognized as the correct ultimate payload. Instead a packet with multiple IPv6 fragment headers would unexpectedly be interpreted as a fragmented packet, rather than as whatever the real payload is.

As a result, IPv6 fragments may bypass pf firewall rules written on the assumption all fragments have been reassembled and, as a result, be forwarded or processed by the host.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Freebsd — Freebsd

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2023-4809",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "secteam@freebsd.org",
      "affectedData": [
        {
          "vendor": "FreeBSD",
          "modules": [
            "pf"
          ],
          "product": "FreeBSD",
          "versions": [
            {
              "status": "affected",
              "version": "13.2-RELEASE",
              "lessThan": "p3",
              "versionType": "release"
            },
            {
              "status": "affected",
              "version": "12.4-RELEASE",
              "lessThan": "p5",
              "versionType": "release"
            }
          ],
          "defaultStatus": "unknown"
        }
      ]
    }
  ],
  "published": "2023-09-06T20:15:08.080",
  "references": [
    {
      "url": "http://www.openwall.com/lists/oss-security/2023/09/08/5",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "secteam@freebsd.org"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2023/09/08/6",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "secteam@freebsd.org"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2023/09/08/7",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "secteam@freebsd.org"
    },
    {
      "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-23:10.pf.asc",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "secteam@freebsd.org"
    },
    {
      "url": "https://security.netapp.com/advisory/ntap-20231221-0009/",
      "source": "secteam@freebsd.org"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2023/09/08/5",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2023/09/08/6",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2023/09/08/7",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-23:10.pf.asc",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://security.netapp.com/advisory/ntap-20231221-0009/",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secteam@freebsd.org",
      "description": [
        {
          "lang": "en",
          "value": "CWE-167"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In pf packet processing with a 'scrub fragment reassemble' rule, a packet containing multiple IPv6 fragment headers would be reassembled, and then immediately processed.  That is, a packet with multiple fragment extension headers would not be recognized as the correct ultimate payload. Instead a packet with multiple IPv6 fragment headers would unexpectedly be interpreted as a fragmented packet, rather than as whatever the real payload is.\n\n\n\n\nAs a result, IPv6 fragments may bypass pf firewall rules written on the assumption all fragments have been reassembled and, as a result, be forwarded or processed by the host."
    },
    {
      "lang": "es",
      "value": "En el procesamiento de paquetes pf con una regla 'scrub fragment reassemble', un paquete que contenga múltiples encabezados de fragmentos IPv6 se reensamblaría y luego se procesaría inmediatamente. Es decir, un paquete con múltiples encabezados de extensión de fragmentos no sería reconocido como el payload final correcto. En cambio, un paquete con múltiples encabezados de fragmentos IPv6 se interpretaría inesperadamente como un paquete fragmentado, en lugar de como cualquier payload real. Como resultado, los fragmentos de IPv6 pueden eludir las reglas del firewall escritas bajo el supuesto de que todos los fragmentos se han reensamblado y, como resultado, el host los reenvía o procesa."
    }
  ],
  "lastModified": "2026-06-17T06:38:37.910",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A7F6C8B0-9D75-476C-ADBA-754416FBC186",
              "versionEndExcluding": "12.4"
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BA49E374-9F1A-4F62-B88D-CD36EDEA6060",
              "versionEndExcluding": "13.2",
              "versionStartIncluding": "13.0"
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:12.4:-:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "24920B4D-96C0-401F-B679-BEB086760EAF"
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:12.4:p1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3CE32730-A9F5-4E8D-BDA4-6B8232F84787"
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:12.4:p2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "552E81DE-D409-475F-8ED0-E10A0BE43D29"
            },
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              "vulnerable": true,
              "matchCriteriaId": "251CAE22-C3E6-45AD-8301-F36BEE5C6860"
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:12.4:p4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "85D94BCA-FA32-4C10-95CD-5D2A69B38A7A"
            },
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              "matchCriteriaId": "BA821886-B26B-47A6-ABC9-B8F70CE0ACFB"
            },
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              "vulnerable": true,
              "matchCriteriaId": "220629AD-32CC-4303-86AE-1DD27F0E4C65"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "A87EFA20-DD6B-41C5-98FD-A29F67D2E732"
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:13.2:p1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2888B0C1-4D85-42EC-9696-03FAD0A9C28F"
            },
            {
              "criteria": "cpe:2.3:o:freebsd:freebsd:13.2:p2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A3306F11-D3C0-41D6-BB5E-2ABDC3927715"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "secteam@freebsd.org"
}