A Web Application Firewall (WAF) acts as a filter between users and web applications, inspecting HTTP/HTTPS traffic to block threats such as SQL injections, XSS attacks, brute-force attempts, and malicious bots. It operates at the CDN, load balancer, or reverse proxy level, allowing administrators to implement rules like rate limiting, IP whitelisting, and blocking specific HTTP methods.
Deployment options vary based on infrastructure needs. Cloud-based WAFs, such as those integrated into CDN services, are suitable for small and medium-sized sites due to ease of implementation. Reverse proxy solutions like ModSecurity or Coraza offer more control but require manual configuration. Large enterprises often deploy WAFs within their infrastructure to manage complex microservices and API security.
Cloud4U offers a managed WAF service based on Positive Technologies' PT Application Firewall. This solution includes signature-based and behavioral analysis, machine learning, and 24/7 monitoring by a Security Operations Center (SOC) within Russian data centers. The service is designed to handle fine-tuning and incident monitoring for the client.
A WAF is not a substitute for fundamental security practices. It should be used alongside regular software updates, multi-factor authentication, strong password policies, and secure administrative access management. Experts recommend initially running the WAF in monitoring mode to identify false positives before enabling active blocking.
