CVE-2023-24815
StaticHandler disclosure of classpath resources on Windows when mounted on a wildcard route
Impact
### 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
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| maven | io.vertx:vertx-web | >= 4.0.0, < 4.3.8 | 4.3.8 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Eclipse | Vert.X-Web | from 4.0.0 before 4.3.8 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/vert-x3/vertx-web/blob/62c0d66fa1c179ae6a4d57344631679a2b97e60f/vertx-web/src/main/java/io/vertx/ext/web/impl/Utils.java#L83
- https://github.com/vert-x3/vertx-web/commit/9e3a783b1d1a731055e9049078b1b1494ece9c15
- https://github.com/vert-x3/vertx-web/security/advisories/GHSA-53jx-vvf9-4x38
- https://github.com/advisories/GHSA-53jx-vvf9-4x38
- https://nvd.nist.gov/vuln/detail/CVE-2023-24815