Although secure, this has one obvious drawback: your service becomes unavailable to regular, non-malicious users if the WAF cannot respond. The request is blocked, nothing is forwarded to the back-end service, and a 500 “internal server error” is returned to the client error.ĪWS calls this “fail closed”: think “closed” like a door (not a switch)-nothing at all gets through. So what happens in that rare situation when your ALB can’t get a timely response from its associated WAF to validate an HTTP request? With the recent addition of “WAF fail open”, you now have a choice: whether to remain secure, or to remain available.īy default, the ALB takes a security-first approach: if the WAF cannot check the request, it is treated as malicious.
However, as we’ll see, this integration is not quite seamless: they are two separate services, connected via the AWS internal network. This product, which is specially designed to protect web applications, prevents attacks that cannot be detected by softwares like classic firewalls and intrusion prevention systems.The AWS Application Load Balancer (ALB) and Web Application Firewall (WAF) are two popular services that play extremely well together. HAVELSAN WAF/LB is a Load Balancing and Web Application Firewall product that is developed to provide load balancing for very high level network traffic and to detect and block attacks against web applications that are among the cyber attack targets. Load balancer and web application firewall device examines the traffic analyzed in detail and protects against attacks by using various algorithms. Web application firewall devices are family members of network application security devices developed to provide security for web applications which firewalls and IPS/IDS devices cannot. Basically, for the continuity of applications or services, they ensure that requests from clients are distributed to the servers that offer the application in accordance with the determined policies. Load balancers are products that allow multiple servers to be operated in harmony so that Information Technologies electronic services can work without interruption.
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