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In detail: Network-Based, Host-Based, and Cloud-Based WAF’s WAF can be implemented as shown below.

Subsequently is why many WAFs offer a hybrid security model, which implements both. Both Blacklists and Whitelists have their advantages and drawbacks. It is like the bouncer at an exclusive party they only accept people on the list. Conversely, a WAF based on a Whitelist (Positive Security Model) only admits pre-approved traffic. He/She is instructed to deny admittance to guests who don’t meet the dress code. Think of a blacklist WAF as a club bouncer.

Differences between Blacklist and Whitelist WAF’sĪ WAF that operates based on a Blacklist (Negative Security Model) protects against known attacks. During a DDoS attack, rate limiting can be quickly applied by modifying WAF policies. The value of a WAF comes in part from the speed and ease with which policy modification can be implemented - allowing for faster response to different attack vectors. These policies aim to protect against vulnerabilities in the application by filtering out malicious traffic. A WAF is a reverse proxy, protecting the server from exposure by having clients pass through the WAF before reaching the server.Ī WAF operates through a set of rules, often called policies. A proxy server will protect a client machine’s identity by using an intermediary. Together create a holistic defence against a range of attack vectors.īy deploying a WAF in front of a web application, a shield is placed between the web application and the Internet. This method of attack mitigation is usually part of a suite of tools. It is not designed to defend against all types of attacks. A WAF is a protocol at Application Layer 7 defence (in the OSI model). It typically protects web applications from attacks, such as cross-site forgery, cross-site-scripting (XSS), file inclusion, and SQL injection. By filtering and monitoring HTTP traffic between a web application and the Internet. How does it work – Web Application Firewall (WAF)?Ī WAF or Web Application Firewall helps protect web applications.