JWT Algorithm Confusion in json-web-token library

joaquimserafim/json-web-token is a javascript library use to interact with JSON Web Tokens (JWT) which are a compact URL-safe means of representing claims to be transferred between two parties. Affected versions of the json-web-token library are vulnerable to a JWT algorithm confusion attack. On line 86 of the 'index.js' file, the algorithm to use for verifying the signature of the JWT token is taken from the JWT token, which at that point is still unverified and thus shouldn't be trusted. To exploit this vulnerability, an attacker needs to craft a malicious JWT token containing the HS256 algorithm, signed with the public RSA key of the victim application. This attack will only work against this library is the RS256 algorithm is in use, however it is a best practice to use that algorithm.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

对数据真实性的验证不充分

JSON Web Token 安全漏洞

JSON Web Token是一种紧凑的 URL 安全方式，用于表示要在两方之间传输的声明。 JSON Web Token 3.1.1之前版本存在安全漏洞，该漏洞源于容易受到 JWT 算法混淆攻击。

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