FKIE_CVE-2016-9243

Vulnerability from fkie_nvd - Published: 2017-03-27 17:59 - Updated: 2026-06-17 00:55
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.
References
secalert@redhat.comhttp://www.openwall.com/lists/oss-security/2016/11/09/2Mailing List, Patch, VDB Entry
secalert@redhat.comhttp://www.securityfocus.com/bid/94216Broken Link, Third Party Advisory, VDB Entry
secalert@redhat.comhttp://www.ubuntu.com/usn/USN-3138-1Third Party Advisory
secalert@redhat.comhttps://cryptography.io/en/latest/changelogRelease Notes, Third Party Advisory
secalert@redhat.comhttps://github.com/pyca/cryptography/commit/b924696b2e8731f39696584d12cceeb3aeb2d874Patch, Third Party Advisory
secalert@redhat.comhttps://github.com/pyca/cryptography/issues/3211Issue Tracking, Third Party Advisory
secalert@redhat.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXL/Mailing List, Third Party Advisory
secalert@redhat.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U23KDR2M2N7W2ZSREG63BVW7D4VC6CIZ/Mailing List, Third Party Advisory
secalert@redhat.comhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQ5G7KHKZC4SI23JE7277KZXM57GEQKT/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2016/11/09/2Mailing List, Patch, VDB Entry
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/94216Broken Link, Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108http://www.ubuntu.com/usn/USN-3138-1Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://cryptography.io/en/latest/changelogRelease Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/pyca/cryptography/commit/b924696b2e8731f39696584d12cceeb3aeb2d874Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/pyca/cryptography/issues/3211Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXL/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U23KDR2M2N7W2ZSREG63BVW7D4VC6CIZ/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQ5G7KHKZC4SI23JE7277KZXM57GEQKT/Mailing List, Third Party Advisory
Impacted products
Vendor Product Version
cryptography.io cryptography *
fedoraproject fedora 23
fedoraproject fedora 24
fedoraproject fedora 25
canonical ubuntu_linux 16.04
canonical ubuntu_linux 16.10
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "secalert@redhat.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "matchCriteriaId": "364A7918-B64B-4A2A-9D8E-7C9FDB18E19C",
              "versionEndIncluding": "1.5.2",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
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              "vulnerable": true
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              "matchCriteriaId": "C729D5D1-ED95-443A-9F53-5D7C2FD9B80C",
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      ]
    },
    {
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              "vulnerable": true
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          ],
          "negate": false,
          "operator": "OR"
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      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size."
    },
    {
      "lang": "es",
      "value": "HKDF en criptograf\u00eda en versiones anteriores a 1.5.2 devuelve una cadena de bytes vac\u00eda si se utiliza con una longitud inferior que algorithm.digest_size."
    }
  ],
  "id": "CVE-2016-9243",
  "lastModified": "2026-06-17T00:55:43.337",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2017-03-27T17:59:00.460",
  "references": [
    {
      "source": "secalert@redhat.com",
      "tags": [
        "Mailing List",
        "Patch",
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      ],
      "url": "http://www.openwall.com/lists/oss-security/2016/11/09/2"
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    {
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    {
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    {
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    {
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      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXL/"
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    },
    {
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  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Modified",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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