GHSA-53jx-vvf9-4x38 StaticHandler disclosure of classpath resources on Windows when mounted on a wildcard route

• Maven io.vertx:vertx-web: >= 4.0.0, < 4.3.8 → fixed in 4.3.8

Summary When running vertx web applications that serve files using `StaticHandler` on Windows Operating Systems and Windows File Systems, if the mount point is a wildcard (`*`) then an attacker can exfiltrate any class path resource. Details When computing the relative path to locate the resource, in case of wildcards, the code: https://github.com/vert-x3/vertx-web/blob/62c0d66fa1c179ae6a4d57344631679a2b97e60f/vertx-web/src/main/java/io/vertx/ext/web/impl/Utils.java#L83 returns the user input (without validation) as the segment to lookup. Even though checks are performed to avoid escaping the sandbox, given that the input was not sanitized `\` are not properly handled and an attacker can build a path that is valid within the classpath. PoC https://github.com/adrien-aubert-drovio/vertx-statichandler-windows-traversal-path-vulnerability