![]() ![]() If this matches an incoming packet, the WAF marks this as bad and discards it. For instance, it may look for something like ' AND 1=1 included as part of the GET or POST request. A very simplistic signature may just look for key identifying elements of a typical SQL injection attack. WAF examplesįor instance, WAFs are often used to block SQL injection attacks. Signatures typically identify a specific characteristic of an HTTP packet that you want to allow or deny. This is what is known as signature-based detection. As a result, early WAF products are very similar to other products such as anti-virus software, IDS/IPS products, and others. To do this, you have to provide the WAF with a list of what to block. Much like "normal" firewalls, a WAF is expected to block certain types of traffic. The details of how this works are, as you might suspect, a bit more complicated. Generally speaking, the role of a WAF is to inspect all HTTP traffic destined for a web server, discard "bad" requests, and pass "good" traffic on. A WAF is a firewall specifically designed to handle "web" traffic that is, traffic using the HTTP protocol. Web Application Firewalls (WAFs) are one of those niche uses. How well do you know Linux? Take a quiz and get a badge.Linux system administration skills assessment.A guide to installing applications on Linux.Download RHEL 9 at no charge through the Red Hat Developer program. ![]()
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