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A web application firewall is a special type of application firewall that specially useful for web applications. It is install in front of web applications and monitors web-based (HTTP) traffic - detecting and blocking anything that harmful to system.WAFs are especially benificial to companies that provide products or services over the Internet.some types of web application firewall are Network-based WAFs,Host-based WAFs,Cloud-hosted WAFs.Network-based WAFs are mostly hardware-based and can minimize downtime because they are deployed locally.Host-based Firewall may be fully combine into the application code itself. The advantage of application-based WAF implementation include low cost .
Web Application Firewall is always used with combination of Server Load Balancer, Network Load Balancer (LB) and Network Load Balancing Solutions . Application Firewall attacks against web applications.A lot of research has taken place in web application security .Most WAF dealer only deliver black and white listing functions.There are two security models used in WAF’s . A negative security model, which merge a ‘blacklist’ of attacks patterns as its ruleset, and a positive security model, whose ruleset is referred as a ‘whitelist’. While a blacklist allows all requests except those matched by its patterns, awhitelist will not allow all request .they allow only those request which are defined in its ruleset.
Features of Web Application Firewall :
Validate inputs, thereby stopping dangerous SQL injection, cross-site scripting and directory traversal attacks .
Detect cookie, session or parameter tampering attacks..
Block attacks that exploit vulnerabilities in custom web properties. .
Credit Card and Social Security Number (SSN) masking.
Black Listing/White Listing check.
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