GitHub Advisoryadvisory · npm

GHSA-8v5f-hp78-jgxq Signature Verification Bypass in jwt-simple

HIGH Published 2019-06-06 Modified 2020-08-31 Official page ↗
Ecosystem
npm
Packages
jwt-simple
Severity
High
Weaknesses
CWE-347
Reviewed
2019-06-06

Affected packages

• npm jwt-simple: < 0.5.3 → fixed in 0.5.3

Description

Versions of `jwt-simple` prior to 0.5.3 are vulnerable to Signature Verification Bypass. If no algorithm is specified in the `decode()` function, the packages uses the algorithm in the JWT to decode tokens. This allows an attacker to create a HS256 (symmetric algorithm) JWT with the server's public key as secret, and the package will verify it as HS256 instead of RS256 (asymmetric algorithm). Recommendation Upgrade to version 0.5.3 or later.

Related

Weakness · CWE (1)

  • CWE-347 Improper Verification of Cryptographic Signature weakness

References