SC-31: Covert Channel Analysis
CSF v1.1 References:
PF v1.0 References:
- NIST Special Publication 800-53 Revision 5:
- SC-31: Covert Channel Analysis
- Performs a covert channel analysis to identify those aspects of communications within the information system that are potential avenues for covert [Selection (one or more): storage; timing] channels; and
- Estimates the maximum bandwidth of those channels.
Developers are in the best position to identify potential areas within systems that might lead to covert channels. Covert channel analysis is a meaningful activity when there is the potential for unauthorized information flows across security domains, for example, in the case of information systems containing export-controlled information and having connections to external networks (i.e., networks not controlled by organizations). Covert channel analysis is also meaningful for multilevel secure (MLS) information systems, multiple security level (MSL) systems, and cross-domain systems.
SC-31(1): Test Covert Channels For Exploitability
The organization tests a subset of the identified covert channels to determine which channels are exploitable.
SC-31(2): Maximum Bandwidth
The organization reduces the maximum bandwidth for identified covert [Selection (one or more); storage; timing] channels to [Assignment: organization-defined values].
SC-31(3): Measure Bandwidth In Operational Environments
The organization measures the bandwidth of [Assignment: organization-defined subset of identified covert channels] in the operational environment of the information system.