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How to bypass Cloudflare restrictions using Burp Suite
Bypassing Cloudflare WAF during security assessments involves handling headers, TLS fingerprinting, IP reputation, and JS challenges; however, the most effective approach is IP whitelisting, with tools like mitmproxy and custom TLS setups covering most remaining cases.
Understanding Cloudflare's Blocking of Burp Suite and Why Generic Solutions Fail
Cloudflare's advanced bot detection system employs multiple fingerprinting layers. Simply altering the User-Agent header is inadequate; failing any layer can lead to blocking.
Cloudflare Detection Layers
| Layer | Evaluation Criteria | Burp Suite Default Behavior |
|---|---|---|
| TLS Fingerprint (JA3) | Cipher suites, TLS extensions, elliptic curves | Identified as a proxy tool |
| HTTP/2 Fingerprint | Stream priority, SETTINGS frames, header ordering | Sends non-browser HTTP/2 frames or downgrades |
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