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NIST 800-53 v5
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SC-7(4): External Telecommunications Services
External Telecommunications Services
SC-7(4): External Telecommunications Services
(a) Implement a managed interface for each external telecommunication service;
(b) Establish a traffic flow policy for each managed interface;
(c) Protect the confidentiality and integrity of the information being transmitted across each interface;
(d) Document each exception to the traffic flow policy with a supporting mission or business need and duration of that need;
(e) Review exceptions to the traffic flow policy [Assignment: organization-defined frequency] and remove exceptions that are no longer supported by an explicit mission or business need;
(f) Prevent unauthorized exchange of control plane traffic with external networks;
(g) Publish information to enable remote networks to detect unauthorized control plane traffic from internal networks; and
(h) Filter unauthorized control plane traffic from external networks.
Implementation
Not applicable - Not applicable
Planned - The implementation is planned
In progress - The implementation is currently in progress
Partially implemented - The control is partially implemented
Implemented - The control is fully implemented
Alternative implementation - There is an alternative implementation in place (e.g., shared responsibility or inherited implementation)
Description

External telecommunications services can provide data and/or voice communications services. Examples of control plane traffic include routing, Domain Name System (DNS), and management. Unauthorized control plane traffic can occur through a technique known as “spoofing.”