Level 5 CMMC - CMMC Practices

SI.2.217  

Reference: CMMC 1.02

Family: SI

Level Introduced: 2

Practice:
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; and
• 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.

3.14.7

Identify unauthorized use of organizational systems.

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.

Source: NIST Special Publication 800-171 Rev. 2

SI-4

INFORMATION SYSTEM MONITORING

Description:
The organization:
    a. Monitors the information system to detect:
        1. Attacks and indicators of potential attacks in accordance with [Assignment: organization-defined monitoring objectives]; and
        2. Unauthorized local, network, and remote connections;
    b. Identifies unauthorized use of the information system through [Assignment: organization-defined techniques and methods];
    c. Deploys monitoring devices:
        1. Strategically within the information system to collect organization-determined essential information; and
        2. At ad hoc locations within the system to track specific types of transactions of interest to the organization;
    d. Protects information obtained from intrusion-monitoring tools from unauthorized access, modification, and deletion;
    e. Heightens the level of information system monitoring activity whenever there is an indication of increased risk to organizational operations and assets, individuals, other organizations, or the Nation based on law enforcement information, intelligence information, or other credible sources of information;
    f. Obtains legal opinion with regard to information system monitoring activities in accordance with applicable federal laws, Executive Orders, directives, policies, or regulations; and
    g. Provides [Assignment: organization-defined information system monitoring information] to [Assignment: organization-defined personnel or roles] [Selection (one or more): as needed; [Assignment: organization-defined frequency]].

Supplemental Guidance:
Information system monitoring includes external and internal monitoring. External monitoring includes the observation of events occurring at the information system boundary (i.e., part of perimeter defense and boundary protection). Internal monitoring includes the observation of events occurring within the information system. Organizations can monitor information systems, for example, by observing audit activities in real time or by observing other system aspects such as access patterns, characteristics of access, and other actions. The monitoring objectives may guide determination of the events. Information system monitoring capability 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). Strategic locations for monitoring devices include, for example, selected perimeter locations and near server farms supporting critical applications, with such devices typically being employed at the managed interfaces associated with controls SC-7 and AC-17. Einstein network monitoring devices from the Department of Homeland Security can also be included as monitoring devices. The granularity of monitoring information collected is based on organizational monitoring objectives and the capability of information systems to support such objectives. Specific types of transactions of interest include, for example, Hyper Text Transfer Protocol (HTTP) traffic that bypasses HTTP proxies. Information system monitoring is an integral part of organizational continuous monitoring and incident response programs. Output from system monitoring serves as input to continuous monitoring and incident response programs. A network connection is any connection with a device that communicates through a network (e.g., local area network, Internet). A remote connection is any connection with a device communicating through an external network (e.g., the Internet). Local, network, and remote connections can be either wired or wireless. Related controls: AC-3, AC-4, AC-8, AC-17, AU-2, AU-6, AU-7, AU-9, AU-12, CA-7, IR-4, PE-3, RA-5, SC-7, SC-26, SC-35, SI-3, SI-7.

Source: NIST Special Publication 800-53 Rev. 4

Source: CMMC v1.02