$100 worth Rate Limit Bypass Bug | Advanced Tricks & Tips

Hidden/Secret Tips and Tricks to Bypass Rate Limiting

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Hi geeks, it4chis3c (Twitter) came-up with another bounty earning write-up in the Bug Bounty Hunting Series:

It4chis3c

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Credit: DALL-E

Rate limiting stops attackers from flooding systems (e.g., brute-forcing passwords). But if you can bypass it, you might:

• Hijack accounts (credential stuffing).
• Spam APIs (financial/reputational damage).
• Bypass 2FA (reset passwords or OTPs).

Impact: High-severity findings ($$$ bounties).

Understanding Rate Limits

Systems track requests using:

1. IP Address: Easy to bypass with proxies.
2. User Sessions: Cookies or tokens tied to your account.
3. Endpoint-Specific Limits: E.g., 5 login attempts/minute.
4. Headers/Parameters: Like API keys or custom headers.