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Number Title Impact Priority Subject Area
SC-4 Information In Shared Resources MODERATE P1 System And Communications Protection

The information system prevents unauthorized and unintended information transfer via shared system resources.
This control prevents information, including encrypted representations of information, produced by the actions of prior users/roles (or the actions of processes acting on behalf of prior users/roles) from being available to any current users/roles (or current processes) that obtain access to shared system resources (e.g., registers, main memory, hard disks) after those resources have been released back to information systems. The control of information in shared resources is also commonly referred to as object reuse and residual information protection. This control does not address: (i) information remanence which refers to residual representation of data that has been nominally erased or removed; (ii) covert channels (including storage and/or timing channels) where shared resources are manipulated to violate information flow restrictions; or (iii) components within information systems for which there are only single users/roles.

SC-4 (1) Security Levels

Withdrawn: Incorporated into SC-4.

SC-4 (2) Periods Processing
This control enhancement applies when there are explicit changes in information processing levels during information system operations, for example, during multilevel processing and periods processing with information at different classification levels or security categories. Organization-defined procedures may include, for example, approved sanitization processes for electronically stored information.

The information system prevents unauthorized information transfer via shared resources in accordance with Assignment: organization-defined procedures when system processing explicitly switches between different information classification levels or security categories.