Threat Model: 0xj4f/genesis - Triple redundancy + code validation

[0xj4f]

Final Validation - Threat Model

Corrected Executive Summary
The Genesis Identity & Access Management service is a FastAPI‑based OAuth2 provider that issues JWT access and refresh tokens. User and profile data are persisted in a MySQL database via SQLAlchemy. All protected routes depend on a token‑validation dependency, but the application currently suffers from several clearly‑observable weaknesses:

• Tokens are printed to stdout (debug print statements) and are returned in clear JSON responses, enabling easy capture via insecure client‑side storage or man‑in‑the‑middle attacks.
• Refresh tokens are issued together with access tokens and are transmitted without any additional protection (no Secure / HttpOnly cookie, no TLS enforcement in the code).
• The JWT signing secret is a static symmetric key (HS256). If the secret is ever disclosed, an attacker can forge or modify token payloads.
• Authentication attempts are not logged, preventing reliable forensic analysis and opening the door to repudiation.
• The public /users endpoint returns full user objects—including e‑mail addresses—without any access control, exposing personally‑identifiable information.
• Verbose error handling (print statements) leaks token values and stack traces to any caller.
• The /token (login) and /profile (creation) endpoints have no rate‑limiting, making them vulnerable to credential‑stuffing, brute‑force, and connection‑exhaustion denial‑of‑service attacks.
• The CORS middleware is configured with a wildcard origin ("*"), allowing any website to issue authenticated cross‑origin requests against the API.

These issues map to the STRIDE categories Spoofing, Tampering, Repudiation, Information Disclosure, Denial‑of‑Service and elevate the overall risk posture of the service.

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Corrected Threat Mapping Table

Canonical ID	Original IDs (Report # : ID)	STRIDE	Merged Description	DREAD Score*
T1	1:T1  2:T1  3:T1	S – Spoofing	An attacker can obtain a valid JWT access token (the code prints the token to STDOUT and returns it in JSON) and reuse it to impersonate the legitimate user.	33 (High)
T2	1:T2  2:T2  3:T2	S – Spoofing	A refresh token is issued together with the access token and is sent in clear JSON without Secure/HttpOnly protection, permitting interception and long‑term account takeover.	37 (High)
T3	1:T3  2:T3  3:T3	T – Tampering	JWTs are signed with a static symmetric secret (HS256). If the SECRET_KEY is disclosed, an attacker can alter token claims (e.g., sub) and re‑sign the token, achieving privilege escalation.	31 (High)
T5	1:T5  2:T5  3:T5	R – Repudiation	Authentication events (successful and failed logins) are not logged anywhere in the codebase, making it impossible to prove who performed an action or to investigate incidents.	31 (High)
T6	1:T6  2:T6  3:T6	I – Information Disclosure	The public GET /users endpoint returns the full User model (including the email field) without any authentication, exposing personal data to unauthenticated callers.	42 (Critical)
T7	1:T7  2:T7  3:T7	I – Information Disclosure	Verbose print statements leak token payloads and stack‑trace information in HTTP responses, providing an attacker with internal implementation details.	34 (High)
T8	1:T8  2:T8  3:T8	D – Denial of Service	The POST /token endpoint has no rate‑limiting or CAPTCHA, allowing unlimited credential‑guessing or credential‑stuffing attacks that can lock out legitimate users.	41 (Critical)
T9	1:T9  2:T9  3:T9	D – Denial of Service	The POST /profile endpoint (profile creation) lacks any throttling; an attacker can issue a flood of creation requests, exhausting database connections and causing service outage.	26 (Medium)
T11 (new)	–	I – Information Disclosure	CORS is configured with allow_origins=["*"], permitting any third‑party site to make authenticated cross‑origin requests, which can be abused for CSRF‑style attacks or data exfiltration.	N/A

*DREAD scores are taken unchanged from the original “Threat Model 3”. For the newly identified CORS issue (T11) no score was originally provided; it is marked N/A.

Evidence snippets

• Token printing – app/auth/auth.py lines 63‑66: print(f"token: {token}"), print(token), print(username).
• Refresh token creation & return – app/services/auth_service.py lines 30‑42 (payload, create_refresh_token, JSON response).
• Symmetric signing – app/auth/auth.py line 31 (ALGORITHM = os.getenv("OAUTH_ALGORITHM","HS256")) and jwt.encode(..., SECRET_KEY, algorithm=ALGORITHM).
• No auth on /users – app/routes/users.py line 25: @router.get("/", response_model=list[User]) with no Depends(oauth_authenticate_current_user).
• User model includes e‑mail – app/models/user_api_model.py class UserBase field email: EmailStr.
• Verbose prints in internal auth – app/auth/auth.py line 80 print(payload).
• No rate‑limit on /token – app/routes/auth.py defines @router.post("/token") without any throttling middleware.
• No rate‑limit on /profile – app/routes/profiles.py defines @router.post("/") without throttling.
• Wildcard CORS – app/main.py lines 18‑23: origins = ["*"] and allow_origins=origins in CORSMiddleware.

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Notes for the Security Reviewer

Item	Detail
Invalidated threats	T4 (profile tampering) and T10 (admin‑flag escalation) were removed because the only profile endpoints operate on the authenticated user’s own user_id; there is no way for a regular user to edit another user’s profile or set an admin flag that does not exist.
Missing logging	No explicit logging of authentication attempts is present. Adding structured audit logs for login success/failure is a high‑priority remediation.
CORS mis‑configuration	The wildcard origin is a clear issue (new threat T11). Consider restricting allow_origins to known client domains and enable allow_credentials only when required.
Transport security	The code does not enforce HTTPS; token transmission over plain HTTP would allow interception. Deploy behind TLS termination or add checks that reject non‑HTTPS requests.
Token storage guidance	The service returns tokens in JSON; clients must store them securely (HttpOnly + Secure cookies). The server should avoid printing tokens to stdout in production.
Rate‑limiting strategy	Implement global or per‑endpoint rate‑limit (e.g., via slowapi or API‑gateway) for /token and /profile to mitigate T8 and T9.
Potential additional threats	CSRF via open CORS, lack of token revocation list, no audience/issuer rotation, and absence of refresh‑token rotation are not covered in the original reports but are evident from the code. Consider adding them to a broader threat assessment.

All evidence references refer to line numbers in the provided JSON snippets.