SC-10: NETWORK DISCONNECT

TAILORED FOR INDUSTRIAL CONTROL SYSTEMS

• ICS Control Baselines:

• Moderate
• High

The information system terminates the network connection associated with a communications session at the end of the session or after [Assignment: organization-defined time period] of inactivity.

SUPPLEMENTAL GUIDANCE

This control applies to both internal and external networks. Terminating network connections associated with communications sessions include, for example, de-allocating associated TCP/IP address/port pairs at the operating system level, or de-allocating networking assignments at the application level if multiple application sessions are using a single, operating system-level network connection. Time periods of inactivity may be established by organizations and include, for example, time periods by type of network access or for specific network accesses.

ICS SUPPLEMENTAL GUIDANCE

Example compensating controls include providing increased auditing measures or limiting remote access privileges to key personnel.

CONTROL ENHANCEMENTS

NO CONTROL ENHANCEMENTS

REFERENCES:

• NIST Special Publication 800-82 | GUIDE TO INDUSTRIAL CONTROL SYSTEMS (ICS) SECURITY