GHSA-h45m-mgcp-q388 openssl-encrypt: TOTP rate limiter is in-memory only — not shared across workers, lost on restart

• PyPI openssl-encrypt: < 1.4.0 → fixed in 1.4.0

Severity: HIGH Summary The TOTP brute-force rate limiter in `openssl_encrypt_server/modules/pepper/totp.py` at lines 47-98 uses an in-memory `defaultdict(list)` as a class variable. Affected Code ```python class TOTPRateLimiter: def __init__(self, ...): self.attempts: Dict[str, List[datetime]] = defaultdict(list) self.lockouts: Dict[str, datetime] = {} class TOTPService: _rate_limiter = TOTPRateLimiter() # Class variable, in-memory only ``` Impact 1. Rate limit state is not shared across multiple server instances/workers — an attacker can distribute attempts 2. All rate limit state is lost on server restart — allows immediate retry 3. In multi-worker deployments, each worker has independent rate limit state Recommended Fix • Use Redis or the database for rate limit state storage • Or use a shared-memory approach for multi-worker deployments • At minimum, persist lockout state to survive restarts Fix Fixed in commit `2749bc0` on branch `releases/1.4.x` — added abstract RateLimitBackend with InMemoryBackend and DatabaseBackend implementations; defaults to DatabaseBackend when DB available.