Fix Lack of Resources & Rate Limiting in Cuba
Resource exhaustion is the silent killer of availability. In the 'Cuba' environment, failing to throttle ingress traffic or validate payload size is an open invitation for a Denial of Service (DoS). We're hardening the stack by implementing a token-bucket rate limiter and strict memory allocation caps to prevent attackers from nuking the service with high-frequency requests or oversized buffers.
The Vulnerable Pattern
from flask import Flask, request, jsonifyapp = Flask(name)
@app.route(‘/api/cuba/compute’, methods=[‘POST’]) def compute(): # VULNERABLE: No rate limiting, no payload size validation # An attacker can flood this with 10k req/sec or send a 1GB JSON data = request.json.get(‘input’) result = perform_heavy_calculation(data) return jsonify({‘result’: result})
The Secure Implementation
The vulnerable endpoint is a 'low-and-slow' or 'flood' target. The fix implements the Flask-Limiter extension, which uses the Fixed Window or Token Bucket algorithm to drop requests exceeding 5 per minute per IP. Additionally, we check 'request.content_length' before processing to mitigate 'Zip Bomb' or large-scale JSON parsing attacks that consume CPU and RAM. Always offload rate-limit state to a fast K/V store like Redis to ensure consistency across horizontal scaling.
from flask import Flask, request, jsonify
from flask_limiter import Limiter
from flask_limiter.util import get_remote_address
app = Flask(name)
SECURE: Initialize rate limiter with Redis backend for distributed state
limiter = Limiter(
get_remote_address,
app=app,
default_limits=[“100 per hour”],
storage_uri=“redis://localhost:6379”
)
@app.route(‘/api/cuba/compute’, methods=[‘POST’])
@limiter.limit(“5 per minute”) # SECURE: Specific threshold for heavy endpoints
def compute():
# SECURE: Enforce 10KB max payload to prevent memory exhaustion
if request.content_length > 10 * 1024:
return jsonify({‘error’: ‘Payload Too Large’}), 413
data = request.json.get('input')
result = perform_heavy_calculation(data)
return jsonify({'result': result})</code></pre>
Your Cuba API
might be exposed to Lack of Resources & Rate Limiting
74% of Cuba apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
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