Adversaries may block a command message from reaching its intended target to prevent command execution. In OT networks, command messages are sent to provide instructions to control system devices. A blocked command message can inhibit response functions from correcting a disruption or unsafe condition.(Citation: Bonnie Zhu, Anthony Joseph, Shankar Sastry 2011)(Citation: Electricity Information Sharing and Analysis Center; SANS Industrial Control Systems March 2016)

Linked Issues

Issuelinks
Linktype Issue
is related to Techniques
is related to Control Server
is related to Programmable Logic Controller (PLC)
is related to Distributed Control System (DCS) Controller
is related to Intelligent Electronic Device (IED)
is related to Programmable Automation Controller (PAC)
is related to Safety Controller
is related to Human-Machine Interface (HMI)
is related to Field I/O
is related to Remote Terminal Unit (RTU)
is blocked by Detection of Block Command Message
is blocked by Out-of-Band Communications Channel
is blocked by Network Allowlists
is blocked by Static Network Configuration
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