fkie_cve-2018-10903
Vulnerability from fkie_nvd
Published
2018-07-30 16:29
Modified
2024-11-21 03:42
Severity ?
7.5 (High) - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5 (High) - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Summary
A flaw was found in python-cryptography versions between >=1.9.0 and <2.3. The finalize_with_tag API did not enforce a minimum tag length. If a user did not validate the input length prior to passing it to finalize_with_tag an attacker could craft an invalid payload with a shortened tag (e.g. 1 byte) such that they would have a 1 in 256 chance of passing the MAC check. GCM tag forgeries can cause key leakage.
References
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2018:3600
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10903Issue Tracking, Patch, Third Party Advisory
secalert@redhat.comhttps://github.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19efPatch, Third Party Advisory
secalert@redhat.comhttps://usn.ubuntu.com/3720-1/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2018:3600
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10903Issue Tracking, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/pyca/cryptography/pull/4342/commits/688e0f673bfbf43fa898994326c6877f00ab19efPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://usn.ubuntu.com/3720-1/Third Party Advisory
Impacted products
Vendor Product Version
cryptography python-cryptography *
redhat openstack 13
canonical ubuntu_linux 18.04


To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:cryptography:python-cryptography:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "0D920298-3A63-41D5-A65F-C7DE174A306B",
              "versionEndExcluding": "2.3",
              "versionStartIncluding": "1.9.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
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              "matchCriteriaId": "704CFA1A-953E-4105-BFBE-406034B83DED",
              "vulnerable": true
            },
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              "matchCriteriaId": "23A7C53F-B80F-4E6A-AFA9-58EEA84BE11D",
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in python-cryptography versions between \u003e=1.9.0 and \u003c2.3. The finalize_with_tag API did not enforce a minimum tag length. If a user did not validate the input length prior to passing it to finalize_with_tag an attacker could craft an invalid payload with a shortened tag (e.g. 1 byte) such that they would have a 1 in 256 chance of passing the MAC check. GCM tag forgeries can cause key leakage."
    },
    {
      "lang": "es",
      "value": "Se ha encontrado un error en python-cryptography, desde la versi\u00f3n 1.9.0 hasta la 2.3. La API finalize_with_tag no forzaba una longitud de etiqueta m\u00ednima. Si un usuario no validaba la longitud de la entrada antes de pasarla a finalize_with_tag, un atacante podr\u00eda manipular una carga \u00fatil no v\u00e1lida con una etiqueta acortada (p.ej., 1 byte) para as\u00ed tener 1 posibilidad entre 256 de pasar la comprobaci\u00f3n MAC. Las falsificaciones de etiquetas GCM pueden provocar un filtrado de claves."
    }
  ],
  "id": "CVE-2018-10903",
  "lastModified": "2024-11-21T03:42:16.003",
  "metrics": {
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        "baseSeverity": "MEDIUM",
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          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 5.0,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "NONE",
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        "exploitabilityScore": 10.0,
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          "baseScore": 7.5,
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          "confidentialityImpact": "HIGH",
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  "vulnStatus": "Modified",
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      "source": "nvd@nist.gov",
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    }
  ]
}


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