![]() ![]() There are two fundamental security elements to a web application firewall: blocklists and allowlists.Ī blocklist, also called the negative security model, is a list of known attacks the WAF can identify from data signatures and keep from accessing the application. Most often, a WAF is only one element in a suite of security services or appliances that, when combined, protect against a wide range of attacks. These firewalls are not made to protect against all types of attacks. WAFs are designed for a specific purpose: to protect applications from attacks using the Layer 7 protocol. The two protocols that a WAF focuses on reside on Layer 7, or the application layer, of the OSI model. Administrators use and create policies to block traffic deemed untrustworthy so the traffic does not reach the server. ![]() WAFs keep servers safe by monitoring traffic traveling over the HTTP and HTTPS protocols. A web application firewall ( WAF) is a type of firewall that blocks malicious traffic from reaching a web application running on a server.
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