How an Initial SQL Injection Led to Research on URL Normalization and mod_rewrite
The article explores how an SQL injection security analysis led to a more in-depth examination of URL normalization and the Apache mod_rewrite module. It explains how mod_rewrite can redirect different URL formats to uniform paths—a process that, however, poses security risks if not implemented correctly. Particular attention is given to the risk that inadequate normalization can create attack vectors, such as through double slashes or alternative encodings. The article offers technical insights and presents solutions for the secure configuration of rewrite rules.