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FKIE_CVE-2018-8970

Vulnerability from fkie_nvd - Published: 2018-03-24 21:29 - Updated: 2026-06-17 02:05
Severity
7.4 (High) - CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Summary
The int_x509_param_set_hosts function in lib/libcrypto/x509/x509_vpm.c in LibreSSL 2.7.0 before 2.7.1 does not support a certain special case of a zero name length, which causes silent omission of hostname verification, and consequently allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate. NOTE: the LibreSSL documentation indicates that this special case is supported, but the BoringSSL documentation does not.
References
cve@mitre.orghttps://boringssl.googlesource.com/boringssl/+/e759a9cd84198613199259dbed401f4951747cffThird Party Advisory
cve@mitre.orghttps://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.1-relnotes.txtVendor Advisory
cve@mitre.orghttps://github.com/libressl-portable/openbsd/commit/0654414afcce51a16d35d05060190a3ec4618d42Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://boringssl.googlesource.com/boringssl/+/e759a9cd84198613199259dbed401f4951747cffThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.1-relnotes.txtVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/libressl-portable/openbsd/commit/0654414afcce51a16d35d05060190a3ec4618d42Patch, Third Party Advisory
Impacted products
Vendor Product Version
openbsd libressl 2.7.0
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:openbsd:libressl:2.7.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "39DDFDEF-AD05-444B-8BCE-018EC7393F76",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The int_x509_param_set_hosts function in lib/libcrypto/x509/x509_vpm.c in LibreSSL 2.7.0 before 2.7.1 does not support a certain special case of a zero name length, which causes silent omission of hostname verification, and consequently allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate. NOTE: the LibreSSL documentation indicates that this special case is supported, but the BoringSSL documentation does not."
    },
    {
      "lang": "es",
      "value": "La funci\u00f3n int_x509_param_set_hosts en lib/libcrypto/x509/x509_vpm.c en LibreSSL, en versiones 2.7.0 anteriores a la 2.7.1 no soporta determinados casos especiales de una longitud de nombre cero. Esto provoca una omisi\u00f3n silenciosa de la verificaci\u00f3n del nombre de host y, en consecuencia, permite que atacantes Man-in-the-Middle (MitM) suplanten servidores y obtengan informaci\u00f3n sensible mediante un certificado manipulado. NOTA: la documentaci\u00f3n de LibreSSL indica que el programa soporta este caso especial, pero la documentaci\u00f3n de BoringSSL no."
    }
  ],
  "id": "CVE-2018-8970",
  "lastModified": "2026-06-17T02:05:44.810",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 5.8,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 4.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.4,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.0"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2018-03-24T21:29:00.227",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://boringssl.googlesource.com/boringssl/+/e759a9cd84198613199259dbed401f4951747cff"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.1-relnotes.txt"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/libressl-portable/openbsd/commit/0654414afcce51a16d35d05060190a3ec4618d42"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://boringssl.googlesource.com/boringssl/+/e759a9cd84198613199259dbed401f4951747cff"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.7.1-relnotes.txt"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/libressl-portable/openbsd/commit/0654414afcce51a16d35d05060190a3ec4618d42"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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