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Introduction
Industrial automation systems, including Programmable Logic Controllers (PLCs), are increasingly connected to IT networks, exposing them to cybersecurity risks. Open-source tools are now empowering engineers to monitor and secure these systems without proprietary software—but they also introduce new attack surfaces.
Learning Objectives
- Understand how open-source PLC scanning tools work.
- Learn key cybersecurity risks in industrial automation.
- Discover hardening techniques for PLCs and industrial networks.
1. Scanning PLC Tags with Open-Source Python Tools
Vladimir Romanov’s GitHub tool (GitHub Link) scans Rockwell Automation PLCs for tags using Python. Here’s how it works:
Command & Explanation
from pycomm3 import LogixDriver
plc = LogixDriver('192.168.1.10') Replace with PLC IP
tags = plc.get_tag_list()
print(tags)
Steps:
1. Install `pycomm3` (`pip install pycomm3`).
- Run the script to fetch all PLC tags.
3. Output displays tag names and values.
Security Risk: Unauthenticated PLC access can expose sensitive operational data.
2. Securing Rockwell PLCs with Firewall Rules
PLCs often lack authentication, making them vulnerable. Restrict access using Windows Firewall:
Windows Command
New-NetFirewallRule -DisplayName "Block Unauthorized PLC Access" -Direction Inbound -LocalPort 44818 -Protocol TCP -Action Block
Steps:
- Blocks unauthorized access to Rockwell’s default port (44818).
2. Apply only to non-trusted IPs.
3. Detecting PLC Scanning Attempts with Wireshark
Attackers scan for exposed PLCs. Detect scans using Wireshark filters:
Wireshark Filter
tcp.port == 44818 && tcp.flags.syn == 1
Steps:
1. Capture traffic on the PLC network.
2. Filter for SYN packets (indicates scanning).
4. Hardening Linux-Based SCADA Systems
Many industrial systems run on Linux. Disable unnecessary services:
Linux Command
sudo systemctl disable modbus-server.service Example: Disable Modbus
Steps:
1. List services (`systemctl list-unit-files`).
2. Disable unused industrial protocols.
5. Mitigating PLC RCE with Network Segmentation
Prevent lateral movement by isolating PLCs:
Cisco IOS Example
interface VLAN10 description PLC_Network ip access-group PLC_ACL in
Steps:
1. Create an ACL blocking non-engineering IPs.
2. Apply to the PLC VLAN.
What Undercode Say
- Key Takeaway 1: Open-source tools democratize access but increase attack surfaces.
- Key Takeaway 2: Unsecured PLCs are low-hanging fruit for ransomware attacks.
Analysis:
Industrial systems were historically air-gapped, but IT/OT convergence has exposed them. While tools like Romanov’s help engineers, they also aid attackers in reconnaissance. Future attacks may exploit PLCs for supply chain disruptions.
Prediction
By 2026, PLC-focused ransomware will surge, targeting unpatched industrial systems. Companies must adopt zero-trust architectures for OT networks.
Final Word: Open-source automation tools are powerful but require strict security controls. Always segment networks, monitor traffic, and restrict PLC access.
🎯Let’s Practice For Free:
IT/Security Reporter URL:
Reported By: Demeyerdavy I – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
