GHSA-53jx-vvf9-4x38

StaticHandler disclosure of classpath resources on Windows when mounted on a wildcard route

Source: GitHub Advisory Database (reviewed) Moderate CVE-2023-24815

Packages

Ecosystem	Package	Affected	Fixed in
Maven	io.vertx:vertx-web	>= 4.0.0, < 4.3.8	4.3.8

Details

As written in the advisory (Markdown source, shown as plain text).

### 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

References

External links from the advisory. They lead to third-party sites.