This post discusses a bypass for Azure Front Door Web Application Firewall (WAF) specifically targeting the IP restriction feature. Normally, IP restriction is intended to allow or deny traffic based on IP addresses, a critical security feature to control access. However, the TrustedSec team discovered a method to bypass these IP restrictions in Azure's Front Door WAF, undermining this important security layer. The bypass means attackers can potentially access resources even if their IPs are supposed to be blocked, posing a significant security risk. The details of the bypass method were shared in the TrustedSec link, highlighting vulnerabilities in Azure's implementation of IP restriction. This shows the importance of continuously testing WAFs and updating security configurations to prevent unauthorized bypasses. The key takeaway is, even robust cloud security services like Azure Front Door WAF can have vulnerabilities that attackers might exploit, so vigilance and timely patching are crucial.