That Day, a Machine's Network Port Was Unplugged, Halting Production for Five Minutes
I recall three years ago, one day, as I was preparing to leave work, my phone rang. On the production line, Xiao Chen urgently exclaimed, "Tim, we have a disaster! The PVD machine suddenly can't read the recipe, and the entire process is stuck!" I rushed back to the site and discovered a peculiar problem: a perfectly fine network cable for the machine had been unplugged! The result was an entire batch being scrapped, with estimated losses starting in the millions. It was later discovered that an outsourced vendor, while replacing a fan, had accidentally kicked it out. You see, a simple physical disconnection can bring a production line to a halt. This was merely an "accident"; imagine the consequences of a "malicious" attack?
Where's the Problem? Your "Dumb Machines" Aren't So Dumb
To put it plainly, modern manufacturing equipment is no longer just simple robotic arms dancing around. Every single machine, from CVD and PVD to etch machines, conceals an "Industrial Control System" (ICS). These ICS act like the brain of the equipment, controlling temperature, pressure, flow rates—all process parameters rely on them. Previously, we thought these devices were standalone, and a network outage would at most only slow down data transmission. However, now, inter-machine linkages, MES system commands, and even remote monitoring all depend on network connectivity.
So, here's the crucial point: many of these ICS systems run on outdated operating systems like Windows XP, or even older. Think about it: would you dare to go online with your home computer running XP? Yet, these pieces of equipment still use it. They are riddled with vulnerabilities, and unlike your constantly updated mobile apps, vendors rarely release patches for older models. In other words, the network security protection for these machines might be even weaker than your Nokia 3310 from ten years ago.
What to Actually Do? Start with "Network Segmentation"
Frankly, replacing all old equipment is impossible; our budgets would suffer. So, we start with "network segmentation."
- Physical Isolation or Logical Segmentation: Completely separate your equipment network from the office network and external networks. In our case, we later isolated the ICS network, even differentiating the network segments; for example, the office used 192.168.1.X, and the machines used 10.0.0.X. This way, even if someone infiltrates the office network, they cannot directly jump to the machines.
- Firewall Configuration: Set up strict firewalls at the perimeter of the ICS network. Only allow necessary communication protocols and IP addresses to pass. For instance, if the MES system needs to read machine data, then only that specific IP and port should be opened. Everything else should be blocked.
- Vulnerability Scanning and Patching: This point is tougher, but crucial. Regularly conduct vulnerability scans on the equipment's ICS systems. We have found many machines where default passwords were never changed, or unnecessary services were left open. Once discovered, coordinate with the equipment vendor for remediation. Don't underestimate these issues; a single default password could plunge the entire plant into crisis.
The Most Common Trap: Taking Shortcuts and Assuming the "Internal Network is Safe"
Our most common mistake in the past was believing that the "internal network is safe." After all, it wasn't connected to the external internet, so who would attack it? However, on one occasion, a new equipment vendor engineer, for convenience, directly connected his personal laptop to a machine's service port. His laptop happened to carry an unknown Trojan, which silently infected the machine. While it didn't cause massive losses, just troubleshooting the problem took us two weeks. You know, after those two weeks, when the CPK report came out, the entire room was silent for three seconds.
Therefore, any device connecting to the ICS network, including outsourced vendors' laptops, must undergo strict cybersecurity checks. When necessary, provide them with dedicated, controlled laptops or jump servers. Don't let temporary convenience lead to permanent regret.
One Thing You Can Do Today
Check the network settings of your oldest machines and see if they are still using default passwords.