Franziska Buehler

How the CRS protects the vulnerable web application Pixi by OWASP DevSlop

How could the functionality of a WAF be better demonstrated than with a vulnerable web application? In this blog post I introduce Pixi, an intentionally vulnerable web application by the OWASP project DevSlop. I show its known vulnerabilities and examine how the CRS protects against these vulnerabilities. What is Pixi? Pixi is a deliberately vulnerable …

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Core Rule Set Docker Image

The Core Rule Set is installed in just four steps, as described in the Installation Guide. Now, it’s even easier using the CRS Docker container. The effort to start the CRS in front of an application is reduced to a few seconds and only one command. Franziska Bühler, one of the CRS developers, enhanced the …

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Disassembling SQLi Rules

Introduction I would like to explain my work disassembling highly optimized regular expressions. A project like this might discourage many people, but to me, it is very exciting work! I like this kind of investigative work and want to explain what, exactly, I did, why I did it and how! What’s the problem? The SQLi …

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