Cloudflare’s DDoS protections can be bypassed through a specific attack process uncovered by researchers. By setting up a free Cloudflare account and pointing the domain to a victim’s IP address, an attacker can disable protections and route traffic through Cloudflare’s infrastructure, bypassing the company’s security checks. This is possible due to flaws in Cloudflare’s use of a shared certificate for all customers and reliance on traffic originating from its IP ranges. A proof-of-concept demonstrated how easy it is to leverage these logic gaps. While the issues were reported to Cloudflare in March, they have not committed to fixing the problems.
If left unaddressed, these vulnerabilities could render Cloudflare’s protections less effective at stopping attacks on its clients.
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