For Eclipse Jetty versions <= 9.4.40, <= 10.0.2, <= 11.0.2, it is possible for requests to the ConcatServlet with a doubly encoded path to access protected resources within the WEB-INF directory. For example a request to /concat?/%2557EB-INF/web.xml can retrieve the web.xml file. This can reveal sensitive information regarding the implementation of a web application.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Jetty | Eclipse | * | 9.4.41 (excluding) |
| Jetty | Eclipse | 10.0.0 (including) | 10.0.3 (excluding) |
| Jetty | Eclipse | 11.0.0 (including) | 11.0.3 (excluding) |