GitHub Advisoryadvisory · npm
GHSA-8v5f-hp78-jgxq Signature Verification Bypass in jwt-simple
HIGH
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