Vulnerability Information
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Vulnerability Title
Algorithm Confusion Vulnerability in cjwt
Vulnerability Description
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.
CVSS Information
N/A
Vulnerability Type
密码学签名的验证不恰当
Vulnerability Title
cjwt 数据伪造问题漏洞
Vulnerability Description
cjwt是Xmidt开源的一个小型 JWT 处理程序。 cjwt v2.2.0版本存在数据伪造问题漏洞，该漏洞源于算法混淆问题，即系统在验证签名类型时处理不当，未能区分签名令牌，允许攻击者利用签名方法之间的缺乏区分进行攻击。
CVSS Information
N/A
Vulnerability Type
N/A