CVE-2021-28163

In Eclipse Jetty 9.4.32 to 9.4.38, 10.0.0.beta2 to 10.0.1, and 11.0.0.beta2 to 11.0.1, if a user uses a webapps directory that is a symlink, the contents of the webapps directory is deployed as a static webapp, inadvertently serving the webapps themselves and anything else that might be in that directory.

In Eclipse Jetty 9.4.32 to 9.4.38, 10.0.0.beta2 to 10.0.1, and 11.0.0.beta2 to 11.0.1, if a user uses a webapps directory that is a symlink, the contents of the webapps directory is deployed as a static webapp, inadvertently serving the webapps themselves and anything else that might be in that directory.

### Impact If the `${jetty.base}` directory or the `${jetty.base}/webapps` directory is a symlink (soft link in Linux), the contents of the `${jetty.base}/webapps` directory may be deployed as a static web application, exposing the content of the directory for download. For example, the problem manifests in the following `${jetty.base}`: ```$ tree demo-base/ demo-base/ ├── etc ├── lib ├── resources ├── start.d ├── deploy │   └── async-rest.war └── webapps -> deploy ``` ### Workarounds Do not use a symlink

### Impact If the `${jetty.base}` directory or the `${jetty.base}/webapps` directory is a symlink (soft link in Linux), the contents of the `${jetty.base}/webapps` directory may be deployed as a static web application, exposing the content of the directory for download. For example, the problem manifests in the following `${jetty.base}`: ```$ tree demo-base/ demo-base/ ├── etc ├── lib ├── resources ├── start.d ├── deploy │   └── async-rest.war └── webapps -> deploy ``` ### Workarounds Do not use a symlink

En Eclipse Jetty versiones 9.4.32 hasta 9.4.38, versiones 10.0.0.beta2 hasta 10.0.1 y versiones 11.0.0.beta2 hasta 11.0.1, si un usuario usa un directorio de aplicaciones web que es un enlace simbólico, el contenido del directorio de aplicaciones web se implementa como una aplicación web estática, sin darse cuenta, sirviendo las aplicaciones web en sí y cualquier otra cosa que pueda estar en ese directorio.