Hackers breached computer network at key US port but did not disrupt operations

Suspected foreign government-backed hackers last month breached a computer network at one of the largest ports on the US Gulf Coast, but early detection of the incident meant the intruders weren't in a position to disrupt shipping operations, according to a Coast Guard analysis of the incident obtained by CNN and a public statement from a senior US cybersecurity official.

The incident at the Port of Houston is an example of the interest that foreign spies have in surveilling key US maritime ports, and it comes as US officials are trying to fortify critical infrastructure from such intrusions.

"If the compromise had not been detected, the attacker would have had unrestricted remote access to the [IT] network" by using stolen log-in credentials, reads the US Coast Guard Cyber Command's analysis of the report, which is unclassified and marked "For Official Use Only." "With this unrestricted access, the attacker would have had numerous options to deliver further effects that could impact port operations."