FKIE_CVE-2021-41106

Vulnerability from fkie_nvd - Published: 2021-09-28 21:15 - Updated: 2025-11-18 14:00
Severity ?
4.4 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
3.3 (Low) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Summary
JWT is a library to work with JSON Web Token and JSON Web Signature. Prior to versions 3.4.6, 4.0.4, and 4.1.5, users of HMAC-based algorithms (HS256, HS384, and HS512) combined with `Lcobucci\JWT\Signer\Key\LocalFileReference` as key are having their tokens issued/validated using the file path as hashing key - instead of the contents. The HMAC hashing functions take any string as input and, since users can issue and validate tokens, users are lead to believe that everything works properly. Versions 3.4.6, 4.0.4, and 4.1.5 have been patched to always load the file contents, deprecated the `Lcobucci\JWT\Signer\Key\LocalFileReference`, and suggest `Lcobucci\JWT\Signer\Key\InMemory` as the alternative. As a workaround, use `Lcobucci\JWT\Signer\Key\InMemory` instead of `Lcobucci\JWT\Signer\Key\LocalFileReference` to create the instances of one's keys.
References
security-advisories@github.comhttps://github.com/lcobucci/jwt/commit/8175de5b841fbe3fd97d2d49b3fc15c4ecb39a73Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/lcobucci/jwt/commit/c45bb8b961a8e742d8f6b88ef5ff1bd5cca5d01cPatch, Third Party Advisory
security-advisories@github.comhttps://github.com/lcobucci/jwt/security/advisories/GHSA-7322-jrq4-x5hfPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/lcobucci/jwt/commit/8175de5b841fbe3fd97d2d49b3fc15c4ecb39a73Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/lcobucci/jwt/commit/c45bb8b961a8e742d8f6b88ef5ff1bd5cca5d01cPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/lcobucci/jwt/security/advisories/GHSA-7322-jrq4-x5hfPatch, Third Party Advisory
Impacted products
Vendor Product Version
lcobucci jwt *
lcobucci jwt *
lcobucci jwt *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:lcobucci:jwt:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "AF6933FC-B9E6-4498-A663-9618B7F5E158",
              "versionEndExcluding": "3.4.6",
              "versionStartIncluding": "3.4.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:lcobucci:jwt:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "5250E671-1C8D-4CCB-B1AD-CD5718CC414B",
              "versionEndExcluding": "4.0.4",
              "versionStartIncluding": "4.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:lcobucci:jwt:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "42710912-3F0E-4E89-ADB3-AF983D3323A2",
              "versionEndExcluding": "4.1.5",
              "versionStartIncluding": "4.1.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "JWT is a library to work with JSON Web Token and JSON Web Signature. Prior to versions 3.4.6, 4.0.4, and 4.1.5, users of HMAC-based algorithms (HS256, HS384, and HS512) combined with `Lcobucci\\JWT\\Signer\\Key\\LocalFileReference` as key are having their tokens issued/validated using the file path as hashing key - instead of the contents. The HMAC hashing functions take any string as input and, since users can issue and validate tokens, users are lead to believe that everything works properly. Versions 3.4.6, 4.0.4, and 4.1.5 have been patched to always load the file contents, deprecated the `Lcobucci\\JWT\\Signer\\Key\\LocalFileReference`, and suggest `Lcobucci\\JWT\\Signer\\Key\\InMemory` as the alternative. As a workaround, use `Lcobucci\\JWT\\Signer\\Key\\InMemory` instead of `Lcobucci\\JWT\\Signer\\Key\\LocalFileReference` to create the instances of one\u0027s keys."
    },
    {
      "lang": "es",
      "value": "JWT es una biblioteca para trabajar con JSON Web Token y JSON Web Signature. Antes de las versiones 3.4.6, 4.0.4 y 4.1.5, los usuarios de los algoritmos basados en HMAC (HS256, HS384 y HS512) combinados con \"Lcobucci\\JWT\\Signer\\Key\\LocalFileReference\" como clave est\u00e1n emitiendo/validando sus tokens usando la ruta del archivo como clave de hashing - en lugar del contenido. Las funciones de hashing HMAC aceptan cualquier cadena como entrada y, dado que los usuarios pueden emitir y comprobar tokens, los usuarios son llevados a creer que todo funciona correctamente. Las versiones 3.4.6, 4.0.4 y 4.1.5 han sido parcheadas para cargar siempre el contenido del archivo, desaprobando la funci\u00f3n \"Lcobucci\\JWT\\Signer\\Key\\LocalFileReference\", y sugiriendo \"Lcobucci\\JWT\\Signer\\Key\\InMemory\" como alternativa. Como soluci\u00f3n, use \"Lcobucci\\JWT\\SignerKey\\InMemory\" en lugar de \"Lcobucci\\JWT\\SignerKey\\LocalFileReference\" para crear las instancias de las claves propias"
    }
  ],
  "id": "CVE-2021-41106",
  "lastModified": "2025-11-18T14:00:59.213",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "LOW",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 2.1,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:L/AC:L/Au:N/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 4.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 2.5,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 3.3,
          "baseSeverity": "LOW",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 1.4,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-09-28T21:15:07.370",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/lcobucci/jwt/commit/8175de5b841fbe3fd97d2d49b3fc15c4ecb39a73"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/lcobucci/jwt/commit/c45bb8b961a8e742d8f6b88ef5ff1bd5cca5d01c"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/lcobucci/jwt/security/advisories/GHSA-7322-jrq4-x5hf"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/lcobucci/jwt/commit/8175de5b841fbe3fd97d2d49b3fc15c4ecb39a73"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/lcobucci/jwt/commit/c45bb8b961a8e742d8f6b88ef5ff1bd5cca5d01c"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/lcobucci/jwt/security/advisories/GHSA-7322-jrq4-x5hf"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-345"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-345"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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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.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • 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.



Detection rules are retrieved from Rulezet.