Level 5 CMMC - CMMC Practices

AC.3.021  

Reference: CMMC 1.02

Family: AC

Level Introduced: 3

Practice:
Authorize remote execution of privileged commands and remote access to security-relevant information.

CMMC Clarification:
Privileged users need to execute commands with elevated privileges. But not all privileged users are allowed to perform these functions from a remote location, and not all privileged commands can be executed remotely. You must document which user roles have permissions to remotely execute privileged commands to make changes and to access security relevant information. In addition, you must document which administrative functions can be executed remotely. This documentation must be used to establish security mechanisms that enforce the policy.

Example
In accordance with the Access Control Policy certain users may be permitted to perform a limited set of administrative commands from a remote machine. Implement controls to enforce 1) who can remotely execute a privileged command and which privileged commands they can execute, and 2) who is allowed access to security relevant information such as audit log configuration settings.

3.1.15

Authorize remote execution of privileged commands and remote access to security-relevant information.

Discussion:
A privileged command is a human-initiated (interactively or via a process operating on behalf of the human) command executed on a system involving the control, monitoring, or administration of the system including security functions and associated security-relevant information. Security-relevant information is any information within the system that can potentially impact the operation of security functions or the provision of security services in a manner that could result in failure to enforce the system security policy or maintain isolation of code and data. Privileged commands give individuals the ability to execute sensitive, security-critical, or security-relevant system functions. Controlling such access from remote locations helps to ensure that unauthorized individuals are not able to execute such commands freely with the potential to do serious or catastrophic damage to organizational systems. Note that the ability to affect the integrity of the system is considered security-relevant as that could enable the means to by-pass security functions although not directly impacting the function itself.

Source: NIST Special Publication 800-171 Rev. 2

AC-17 (4)

REMOTE ACCESS | PRIVILEGED COMMANDS/ ACCESS

Description:
The organization:
    (a) Authorizes the execution of privileged commands and access to security-relevant information via remote access only for [Assignment: organization-defined needs]; and
    (b) Documents the rationale for such access in the security plan for the information system.

Supplemental Guidance:
Related control: AC-6.

Source: NIST Special Publication 800-53 Rev. 4

Source: CMMC v1.02