Vulnerability Fixation
Misconfigured Rate Limiting

Missing Or Misconfigured Rate Limiting

A rate limit defines the maximum number of requests a user or system can make to a service or endpoint within a specified timeframe. Rate limiting helps prevent misuse or overuse of resources, such as API requests, database queries or server processes.

Without proper rate limiting, attackers can launch brute-force, denial-of-service, or credential-stuffing attacks by sending an excessive number of requests. Implementing rate limits with techniques like IP throttling, user-based quotas, or token buckets helps protect server performance and ensures fair resource usage.

Attack

  • When rate limiting is absent or misconfigured, attackers can flood servers with excessive requests.
  • This can lead to system slowdowns, crashes, or enable brute-force and resource exhaustion attacks.
Impact

  • Denial of Service (DoS): Overwhelming the server with requests, making it unavailable.
  • Brute Force Attacks: Guessing passwords or tokens without restriction.
  • Resource Exhaustion: Draining CPU, memory, or bandwidth.
  • API Abuse: Extracting or manipulating large amounts of data.
Solution

  • Apply Rate Limits: Use mechanisms like fixed window, sliding window, or token bucket.
  • Set Proper Thresholds: Example, 100 API requests/min, 5 login attempts/min.
  • Add CAPTCHA or MFA: Prevent automated brute-force attempts.
  • Monitor Activity: Set alerts for unusual traffic or limit breaches.

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