Two Ways To Mess Up Your JWT Safety Net In Your Own Lab.

The article discusses common mistakes developers make when implementing JSON Web Tokens (JWT) for securing web applications. The author demonstrates two ways a JWT can be exploited:

1. Tampering with the Payload:

   • A user's role in the JWT payload is changed from 'user' to 'admin'.
   • This tampered token bypasses security checks if the server only decodes the token without verifying its signature.
   • Solution: Use jwt.verify(token, JWT_SECRET) instead of jwt.decode(token). The verify function ensures that any modifications to the token payload are detected by checking the digital signature.

2. Cracking the Secret Key:

   • Using a tool like Hashcat, an attacker can brute-force the secret key used for signing JWTs.
   • Once the secret is known, attackers can sign their own tampered tokens and bypass security checks.
   • Solution: Never hard-code secrets in your codebase. Store sensitive information such as JWT_SECRET in environment variables (e.g., .env files) that are excluded from version control.

Key Lessons:

• Never Hardcode Secrets: Keep secret keys out of source code repositories to prevent accidental exposure.
• Use Environment Variables: Store secrets like

Read the full article at InfoSec Write-ups - Medium

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