SRG-OS-000009 |
CCI-000025 |
The operating system must enforce
information flow control using explicit security attributes
on information, source, and destination objects as a basis
for flow control decisions. |
Information flow control regulates where
information is allowed to travel within an information
system and between information systems (as opposed to who is
allowed to access the information) and without explicit
regard to subsequent accesses to the information. Examples
of flow control restrictions include: keeping export
controlled information from being transmitted in the clear
to the Internet; and blocking outside traffic claiming to be
from within the organization and not passing any web
requests to the Internet that are not from the internal web
proxy. Information flow control policies and enforcement
mechanisms are commonly employed by organizations to control
the flow of information between designated sources and
destinations (e.g., networks, individuals, devices) within
information systems and between interconnected systems. Flow
control is based on the characteristics of the information
and/or the information path. Information flow enforcement
mechanisms compare security attributes on all information
(data content and data structure), source and destination
objects, and respond appropriately (e.g., block, quarantine,
alert administrator) when the mechanisms encounter
information flows not explicitly allowed by the information
flow policy. Information flow enforcement using explicit
security attributes can be used, for example, to control the
release of certain types of information. |