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CVE-2024-54150

Estado: AplazadaAlta (8.7)—

cjwt is a C JSON Web Token (JWT) Implementation. Algorithm confusion occurs when a system improperly verifies the type of signature used, allowing attackers to exploit the lack of distinction between signing methods. If the system doesn't differentiate between an HMAC signed token and an RS/EC/PS signed token during verification, it becomes vulnerable to this kind of attack. For instance, an attacker could craft a token with the alg field set to "HS256" while the server expects an asymmetric algorithm like "RS256".

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The server might mistakenly use the wrong verification method, such as using a public key as the HMAC secret, leading to unauthorised access. For RSA, the key can be computed from a few signatures. For Elliptic Curve (EC), two potential keys can be recovered from one signature. This can be used to bypass the signature mechanism if an application relies on asymmetrically signed tokens. This issue has been addressed in version 2.3.0 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Confusión de algoritmo en JWT: servidor sin desdiferenciar HMAC de RSA/EC permite forjar tokens y acceso no autorizado (N/PR:N/VI:H). El atacante obtiene privilegios escalonados y evasión de mecanismos de firma digital.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability ScanningUser Account ManagementPrivileged Account ManagementOperating System ConfigurationNetwork SegmentationLimit Access to Resource Over Network

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Xmidt — CjwtAI

CWE

Referencias

JSON original (NVD)

Mostrar
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      "value": "cjwt is a C JSON Web Token (JWT) Implementation. Algorithm confusion occurs when a system improperly verifies the type of signature used, allowing attackers to exploit the lack of distinction between signing methods.  If the system doesn't differentiate between an HMAC signed token and an RS/EC/PS signed token during verification, it becomes vulnerable to this kind of attack. For instance, an attacker could craft a token with the alg field set to \"HS256\" while the server expects an asymmetric algorithm like \"RS256\". The server might mistakenly use the wrong verification method, such as using a public key as the HMAC secret, leading to unauthorised access. For RSA, the key can be computed from a few signatures. For Elliptic Curve (EC), two potential keys can be recovered from one signature. This can be used to bypass the signature mechanism if an application relies on asymmetrically signed tokens. This issue has been addressed in version 2.3.0 and all users are advised to upgrade. There are no known workarounds for this vulnerability."
    },
    {
      "lang": "es",
      "value": "cjwt es una implementación de token web JSON (JWT) en C. La confusión de algoritmos ocurre cuando un sistema verifica incorrectamente el tipo de firma utilizada, lo que permite a los atacantes explotar la falta de distinción entre los métodos de firma. Si el sistema no diferencia entre un token firmado HMAC y un token firmado RS/EC/PS durante la verificación, se vuelve vulnerable a este tipo de ataque. Por ejemplo, un atacante podría crear un token con el campo alg establecido en \"HS256\" mientras que el servidor espera un algoritmo asimétrico como \"RS256\". El servidor podría usar por error el método de verificación incorrecto, como usar una clave pública como secreto HMAC, lo que lleva a un acceso no autorizado. Para RSA, la clave se puede calcular a partir de algunas firmas. Para Elliptic Curve (EC), se pueden recuperar dos claves potenciales de una firma. Esto se puede utilizar para eludir el mecanismo de firma si una aplicación depende de tokens firmados asimétricamente. Este problema se ha solucionado en la versión 2.3.0 y se recomienda a todos los usuarios que actualicen. No se conocen workarounds para esta vulnerabilidad."
    }
  ],
  "lastModified": "2026-06-17T08:09:51.783",
  "sourceIdentifier": "security-advisories@github.com"
}