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SI.2.217
Content
Control Acronym
SI
Family
System And Information Integrity
CMMC Level
2
800-171 Control #
3.14.7
CMMC Description
Identify unauthorized use of organizational systems.
CMMC Clarification
Organizations should define authorized use of their systems. First, have an acceptable-use policy for your system. This policy establishes the baseline for how users access devices and the internet. You define authorized use by specific roles within the organization. Examples of these roles include user, administrator, and technician. After you define authorized use, identify unauthorized use of systems. Organizations can monitor systems by observing audit activities. You can do this in real time or by other manual means, such as access patterns. To identify unauthorized use, leverage existing tools and techniques, such as: * intrusion detection systems * intrusion prevention systems * malicious code protection software * scanning tools * audit record monitoring software * network monitoring software. Example You are in charge of IT operations at your organization. You want to make sure everyone using an organizational system is authorized to do so. You accomplish this as part of your monitoring activities. These activities ensure that all users meet the defined authorize-use policy. To do this, you put in place a user activity monitoring application. This app monitors all the users and their connections to your network. It records information about every connection on your network. You use the outputs of this application to confirm that you are meeting the authorization policy.
800-171 Description
Identify unauthorized use of organizational systems.
800-171 Discussion
System monitoring includes external and internal monitoring. System monitoring can detect unauthorized use of organizational systems. System monitoring is an integral part of continuous monitoring and incident response programs. Monitoring is achieved through a variety of tools and techniques (e.g., intrusion detection systems, intrusion prevention systems, malicious code protection software, scanning tools, audit record monitoring software, network monitoring software). Output from system monitoring serves as input to continuous monitoring and incident response programs. Unusual/unauthorized activities or conditions related to inbound and outbound communications traffic include internal traffic that indicates the presence of malicious code in systems or propagating among system components, the unauthorized exporting of information, or signaling to external systems. Evidence of malicious code is used to identify potentially compromised systems or system components. System monitoring requirements, including the need for specific types of system monitoring, may be referenced in other requirements. [SP 800-94] provides guidance on intrusion detection and prevention systems.
Other Source Discussion
N/A
CIS Control References
NIST 800-53 Control Ref.
NIST SP 800-53 Rev 4 SI-4
CMMC Derived
NIST CSF Control References
NIST 800-171 References
NIST SP 800-171 Rev 1 3.14.7
Applicable FAR Clause
NIST CSF Control Reference
NIST CSF v1.1 DE.CM-1, DE.CM-7
CERT RMM Reference
CERT RMM v1.2 MON:SG1.SP3
Modification of NIST 800-171B Reference
NIST 800-171B Reference
UK NCSCCyber Reference
AS ACSC Reference
Sub-Criterias
Assessment Sub-Criteria 1
SI.2.217.[a] authorized use of the system is defined; and
Assessment Sub-Criteria 2
SI.2.217.[b] unauthorized use of the system is identified.