Applicable

(Y)es / (N)o

(C)onfidentiality

(I)ntegrity

(A)vailability

RPN

(C+I+A)

(S)atisfactory

L1

M2

H3

L1

M2

H3

L1

M2

H3

(O)ther than satisfactory +##

sc-3(5)

security function isolation  | layered structures

assessment objective:

Determine if the organization implements security functions as a layered structure:

sc-3(5)[1]

minimizing interactions between layers of the design; and

sc-3(5)[2]

avoiding any dependence by lower layers on the functionality or correctness of higher layers.

potential assessment methods and objects:

Examine: [select from: System and communications protection policy; procedures addressing security function isolation; information system design documentation; information system configuration settings and associated documentation; information system audit records; other relevant documents or records].

Interview: [select from: System/network administrators; organizational personnel with information security responsibilities].

Test: [select from: Organizational processes for implementing security functions as a layered structure that minimizes interactions between layers and avoids dependence by lower layers on functionality/correctness of higher layers; automated mechanisms supporting and/or implementing security functions as a layered structure].