AU.L2-3.3.3  

Reference: CMMC v2.13

Family: AU

Level Introduced: 2

Title: Event Review

Practice:
Review and update logged events.

Further Discussion:
This requirement is focused on the configuration of the auditing system, not the review of the audit records produced by the selected events. The review of the audit logs is covered under AU.L2-3.3.5 and AU.L2-3.3.6.

Example
You are in charge of IT operations for a company that processes CUI and are responsible for identifying and documenting which events are relevant to the security of your company’s systems. Your company has decided that this list of events should be updated annually or when new security threats or events have been identified, which may require additional events to be logged and reviewed [a]. The list of events you are capturing in your logs started as the list of recommended events given by the manufacturers of your operating systems and devices, but it has grown from experience.

Your company experiences a security incident, and a forensics review shows the logs appear to have been deleted by a remote user. You notice that remote sessions are not currently being logged [b]. You update the list of events to include logging all VPN sessions [c].

Potential Assessment Considerations
• Do documented processes include methods for determining when to review logged event types (i.e., regular frequency, after incidents, after major system changes) [a]?
• Do documented processes include methods for reviewing event types being logged (i.e., based on specific threat, use case, retention capacity, current utilization, and/or newly added system component or functionality) [b]?

Source: CMMC v2.13