Enhancing ICS Security with OT Network Segmentation
Summary: Dragos describes ICS network segmentation as the control that stops attackers from moving laterally once they have initial access, and warns that flat networks mixing assets like VoIP phones and IP cameras leave vulnerable protocols exposed. The post explains that firewalls tend to loosen over time because overly restrictive rules generate complaints while permissive rules go unnoticed, and it recommends a tiered architecture such as the Purdue model with a DMZ between corporate and ICS/OT networks.
Bottom line: The post's own observation is that no one complains when an application has access it should not - so porous firewall rules accumulate quietly, lowering the barrier an adversary must clear to reach the assets controlling physical processes.
Read the original at Dragos Blog ↗
- Topics
- OT / ICS & Critical Infrastructure
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