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CVE-2021-29446

Estado: ModificadaMedia (5.9)—

jose-node-cjs-runtime is an npm package which provides a number of cryptographic functions. In versions prior to 3.11.4 the AES_CBC_HMAC_SHA2 Algorithm (A128CBC-HS256, A192CBC-HS384, A256CBC-HS512) decryption would always execute both HMAC tag verification and CBC decryption, if either failed `JWEDecryptionFailed` would be thrown.

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But a possibly observable difference in timing when padding error would occur while decrypting the ciphertext makes a padding oracle and an adversary might be able to make use of that oracle to decrypt data without knowing the decryption key by issuing on average 128*b calls to the padding oracle (where b is the number of bytes in the ciphertext block). A patch was released which ensures the HMAC tag is verified before performing CBC decryption. The fixed versions are `>=3.11.4`. Users should upgrade to `^3.11.4`.

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)

Jose-node-cjs-runtime Project — Jose-node-cjs-runtime

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-29446",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.9,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.2
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
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          "baseScore": 5.9,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.2
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  "affected": [
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      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "panva",
          "product": "jose-node-cjs-runtime",
          "versions": [
            {
              "status": "affected",
              "version": "< 3.11.4"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-04-16T22:15:14.140",
  "references": [
    {
      "url": "https://github.com/panva/jose/security/advisories/GHSA-rvcw-f68w-8h8h",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
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    {
      "url": "https://www.npmjs.com/package/jose-node-cjs-runtime",
      "tags": [
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        "Third Party Advisory"
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    },
    {
      "url": "https://github.com/panva/jose/security/advisories/GHSA-rvcw-f68w-8h8h",
      "tags": [
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      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
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      "tags": [
        "Product",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-203"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "jose-node-cjs-runtime is an npm package which provides a number of cryptographic functions. In versions prior to 3.11.4 the AES_CBC_HMAC_SHA2 Algorithm (A128CBC-HS256, A192CBC-HS384, A256CBC-HS512) decryption would always execute both HMAC tag verification and CBC decryption, if either failed `JWEDecryptionFailed` would be thrown. But a possibly observable difference in timing when padding error would occur while decrypting the ciphertext makes a padding oracle and an adversary might be able to make use of that oracle to decrypt data without knowing the decryption key by issuing on average 128*b calls to the padding oracle (where b is the number of bytes in the ciphertext block). A patch was released which ensures the HMAC tag is verified before performing CBC decryption. The fixed versions are `>=3.11.4`. Users should upgrade to `^3.11.4`."
    },
    {
      "lang": "es",
      "value": "jose-node-cjs-runtime es un paquete npm que proporciona una serie de funciones criptográficas.&#xa0;En versiones anteriores a 3.11.4, el descifrado del algoritmo AES_CBC_HMAC_SHA2 (A128CBC-HS256, A192CBC-HS384, A256CBC-HS512) siempre ejecutaba tanto la comprobación de etiquetas HMAC como el descifrado CBC, si se presentaba un fallo \"JWEDecryptionFailed\" sería lanzado.&#xa0;Pero una posible diferencia observable en el tiempo cuando se produciría un error de padding al descifrar el texto cifrado crea un padding oracle y un adversario podría hacer uso de ese oracle para descifrar datos sin conocer la clave de descifrado emitiendo un promedio de 128*b llamadas al padding oracle (donde b es el número de bytes en el bloque de texto cifrado).&#xa0;Se lanzó un parche que garantiza que la etiqueta HMAC es comprobada antes de llevar a cabo el descifrado CBC.&#xa0;Las versiones corregidas son \"superiores o iguales a 3.11.4\".&#xa0;Los usuarios deben actualizar a \"^3.11.4\""
    }
  ],
  "lastModified": "2026-06-17T03:47:39.480",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:jose-node-cjs-runtime_project:jose-node-cjs-runtime:*:*:*:*:*:node.js:*:*",
              "vulnerable": true,
              "matchCriteriaId": "03D23205-6974-4025-A286-1F56B7EE9620",
              "versionEndExcluding": "3.11.4"
            }
          ],
          "operator": "OR"
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      ]
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  ],
  "sourceIdentifier": "security-advisories@github.com"
}