GHSA-w7f9-wqc4-3wxr

### Summary A mock API configuration for static file serving following the same approach presented in the [documentation page](https://mockoon.com/tutorials/create-endpoint-serving-static-file/), where the server filename is generated via templating features from user input is vulnerable to Path Traversal and LFI, allowing an attacker to get any file in the mock server filesystem. The issue may be particularly relevant in cloud hosted server instances

### Details In `sendFileWithCallback`([code](https://github.com/mockoon/mockoon/blob/1ed31c4059d7f757f6cb2a43e10dc81b0d9c55a9/packages/commons-server/src/libs/server/server.ts#L1400)) and `sendFile`([code](https://github.com/mockoon/mockoon/blob/1ed31c4059d7f757f6cb2a43e10dc81b0d9c55a9/packages/commons-server/src/libs/server/server.ts#L1551)) the `filePath` variable is parsed using `TemplateParser`

```js let filePath = TemplateParser({ shouldOmitDataHelper: false, // replace backslashes with forward slashes, but not if followed by a dot (to allow helpers with paths containing properties with dots: e.g. {{queryParam 'path.prop\.with\.dots'}}) content: routeResponse.filePath.replace(/\\(?!\.)/g, '/'), environment: this.environment, processedDatabuckets: this.processedDatabuckets, globalVariables: this.globalVariables, request: serverRequest, envVarsPrefix: this.options.envVarsPrefix }); ```

The path extracted from the request parameters used when composing the final file path is not sanitized and is vulnerable to path traversal exploits (e.g. `../../../../../etc/passwd`)

### PoC #### Test setup The issue has been tested with `mockoon-cli`, using the Docker image `mockoon/cli:latest`

[config.json](https://github.com/user-attachments/files/18199899/config.json)

```bash # Folder setup mkdir mockoon-test cd mockoon-test

# put config.json in mockooon-test dir

mkdir static ```

```bash # Run container docker run -d --mount type=bind,source=./config.json,target=/data,readonly -v ./static:/static -p 3000:3000 mockoon/cli:latest -d data -p 3000 ```

#### Payload to reproduce Browsing directly to `http://localhost:3000/static/%2F..%2F..%2F..%2F..%2F..%2Fetc%2Fpasswd` is going to display the `/etc/passwd` file in the container filesystem