OWASP Periodic Table of Vulnerabilities - Brute Force (Generic) / Insufficient Anti-automation

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Contents

Brute Force (Generic) / Insufficient Anti-automation

Root Cause Summary

Applications do not define or detect when request rates are outside the bounds of normal, acceptable use.

Browser / Standards Solution

None

Perimeter Solution

Perimeter technologies including geocaching/proxy services must support automatic and/or manual "panic button" anti-automation, enforcing progressive CAPTCHA for unvalidated requests, triggering on excessive 5XX responses, or direct signal from application.

Generic Framework Solution

Provide configurable per-user/session request rate limits. For authenticated transactions, limits should be configurable on a per-user or per-session basis. Configuration should allow combining multiple limits of the form "# of requests per time period". For example, an administrator should be allowed to combine "10 requests per minute" with "500 requests per day" in order to simultaneously apply policies which prevent users from automatic crawling/screen scraping as well as longer-term slow leeching activities.

Custom Framework Solution

Provide a common configuration functionality available to any feature/function. Configuration settings should allow multiple per-user rate limits as well as global rate limits to prevent denial of service.

Custom Code Solution

Any feature sensitive to high transaction rates should expose configurable rate limits per user or globally per feature.

Discussion / Controversy

Generic framework solution requires too much overhead to track request limits. Request rate limiting should be done in perimeter, not framework. Should combine with Denial of Service (Application-Based)? Custom Code solution is the same as Custom Framework Solution; Custom Code solution should be pushed into framework.

References

Insufficient Anti-automation (WASC TC)
Brute Force (WASC TC)
Testing for Brute Force (OWASP Testing Guide)