Forgeable Public/Private Tokens

Overview

Affected versions of the jwt-simple package allow users to select what algorithm the server will use to verify a provided JWT. A malicious actor can use this behaviour to arbitrarily modify the contents of a JWT while still passing verification. For the common use case of the JWT, the end result is a complete authentication bypass with minimal effort.

Recommendation

Update to version 0.3.1 or later.

Additionally, be sure to always specify an algorithm in calls to .decode().

References

• Auth0 - Critical Vulnerabilities in JWT Libraries
• PR #14
• PR #16
• GitHub Advisory