Control statement
- a.Define and document the types of accounts allowed and specifically prohibited for use within the system;
- b.Assign account managers;
- c.Require [Organization-defined: prerequisites and criteria] for group and role membership;
- d.Specify:
- 1.Authorized users of the system;
- 2.Group and role membership; and
- 3.Access authorizations (i.e., privileges) and [Organization-defined: attributes (as required)] for each account;
- e.Require approvals by [Organization-defined: personnel or roles] for requests to create accounts;
- f.Create, enable, modify, disable, and remove accounts in accordance with [Organization-defined: policy, procedures, prerequisites, and criteria];
- g.Monitor the use of accounts;
- h.Notify account managers and [Organization-defined: personnel or roles] within:
- 1.[Organization-defined: time period] when accounts are no longer required;
- 2.[Organization-defined: time period] when users are terminated or transferred; and
- 3.[Organization-defined: time period] when system usage or need-to-know changes for an individual;
- i.Authorize access to the system based on:
- 1.A valid access authorization;
- 2.Intended system usage; and
- 3.[Organization-defined: attributes (as required)];
- j.Review accounts for compliance with account management requirements [Organization-defined: frequency];
- k.Establish and implement a process for changing shared or group account authenticators (if deployed) when individuals are removed from the group; and
- l.Align account management processes with personnel termination and transfer processes.
Discussion
Examples of system account types include individual, shared, group, system, guest, anonymous, emergency, developer, temporary, and service. Identification of authorized system users and the specification of access privileges reflect the requirements in other controls in the security plan. Users requiring administrative privileges on system accounts receive additional scrutiny by organizational personnel responsible for approving such accounts and privileged access, including system owner, mission or business owner, senior agency information security officer, or senior agency official for privacy. Types of accounts that organizations may wish to prohibit due to increased risk include shared, group, emergency, anonymous, temporary, and guest accounts. Where access involves personally identifiable information, security programs collaborate with the senior agency official for privacy to establish the specific conditions for group and role membership; specify authorized users, group and role membership, and access authorizations for each account; and create, adjust, or remove system accounts in accordance with organizational policies. Policies can include such information as account expiration dates or other factors that trigger the disabling of accounts. Organizations may choose to define access privileges or other attributes by account, type of account, or a combination of the two. Examples of other attributes required for authorizing access include restrictions on time of day, day of week, and point of origin. In defining other system account attributes, organizations consider system-related requirements and mission/business requirements. Failure to consider these factors could affect system availability. Temporary and emergency accounts are intended for short-term use. Organizations establish temporary accounts as part of normal account activation procedures when there is a need for short-term accounts without the demand for immediacy in account activation. Organizations establish emergency accounts in response to crisis situations and with the need for rapid account activation. Therefore, emergency account activation may bypass normal account authorization processes. Emergency and temporary accounts are not to be confused with infrequently used accounts, including local logon accounts used for special tasks or when network resources are unavailable (may also be known as accounts of last resort). Such accounts remain available and are not subject to automatic disabling or removal dates. Conditions for disabling or deactivating accounts include when shared/group, emergency, or temporary accounts are no longer required and when individuals are transferred or terminated. Changing shared/group authenticators when members leave the group is intended to ensure that former group members do not retain access to the shared or group account. Some types of system accounts may require specialized training.
Organization-defined parameters
These values must be resolved through the organization’s tailoring and governance process. Bracketed parameter references in the control text identify where a decision is required.
From control text to operational evidence
Use Account Management as a testable risk decision. Translate the official statement into accountable people, repeatable processes, configured technology, and evidence that demonstrates the outcome over time. In this family, pay particular attention to identity, authorization, least privilege, session boundaries, and access lifecycle governance.
Implementation workflow
- Define the control boundary, responsible owner, inherited portions, and systems or processes in scope.
- Resolve each organization-defined parameter before declaring the control implemented.
- Document how the implementation satisfies every clause of the official control statement.
- Collect evidence as a normal byproduct of operation rather than only before an assessment.
- Review exceptions, changes, and monitoring results on a risk-based cadence.
Evidence examples
- access approvals and entitlement records
- role and group configuration exports
- periodic access review results
- authentication and authorization logs
Common failure patterns
- standing privileges that outlive business need
- shared or orphaned accounts
- access rules implemented differently across systems
- approvals that cannot be traced to actual permissions
Questions practitioners should ask
- What risk decision is this control intended to support in this system?
- Which parts are implemented locally, inherited, shared, or not applicable—and what evidence supports that decision?
- Do the documented narrative, deployed configuration, operating process, and collected evidence agree?
- What event or threshold requires the implementation to be reviewed or changed?
Assessment objectives and methods
Show the assessment objective
- AC-02a.
- AC-02a.[01]account types allowed for use within the system are defined and documented;
- AC-02a.[02]account types specifically prohibited for use within the system are defined and documented;
- AC-02b.account managers are assigned;
- AC-02c.[Organization-defined: prerequisites and criteria] for group and role membership are required;
- AC-02d.
- AC-02d.01authorized users of the system are specified;
- AC-02d.02group and role membership are specified;
- AC-02d.03
- AC-02d.03[01]access authorizations (i.e., privileges) are specified for each account;
- AC-02d.03[02][Organization-defined: attributes (as required)] are specified for each account;
- AC-02e.approvals are required by [Organization-defined: personnel or roles] for requests to create accounts;
- AC-02f.
- AC-02f.[01]accounts are created in accordance with [Organization-defined: policy, procedures, prerequisites, and criteria];
- AC-02f.[02]accounts are enabled in accordance with [Organization-defined: policy, procedures, prerequisites, and criteria];
- AC-02f.[03]accounts are modified in accordance with [Organization-defined: policy, procedures, prerequisites, and criteria];
- AC-02f.[04]accounts are disabled in accordance with [Organization-defined: policy, procedures, prerequisites, and criteria];
- AC-02f.[05]accounts are removed in accordance with [Organization-defined: policy, procedures, prerequisites, and criteria];
- AC-02g.the use of accounts is monitored;
- AC-02h.
- AC-02h.01account managers and [Organization-defined: personnel or roles] are notified within [Organization-defined: time period] when accounts are no longer required;
- AC-02h.02account managers and [Organization-defined: personnel or roles] are notified within [Organization-defined: time period] when users are terminated or transferred;
- AC-02h.03account managers and [Organization-defined: personnel or roles] are notified within [Organization-defined: time period] when system usage or the need to know changes for an individual;
- AC-02i.
- AC-02i.01access to the system is authorized based on a valid access authorization;
- AC-02i.02access to the system is authorized based on intended system usage;
- AC-02i.03access to the system is authorized based on [Organization-defined: attributes (as required)];
- AC-02j.accounts are reviewed for compliance with account management requirements [Organization-defined: frequency];
- AC-02k.
- AC-02k.[01]a process is established for changing shared or group account authenticators (if deployed) when individuals are removed from the group;
- AC-02k.[02]a process is implemented for changing shared or group account authenticators (if deployed) when individuals are removed from the group;
- AC-02l.
- AC-02l.[01]account management processes are aligned with personnel termination processes;
- AC-02l.[02]account management processes are aligned with personnel transfer processes.
Examine
- Access control policy
- personnel termination policy and procedure
- personnel transfer policy and procedure
- procedures for addressing account management
- system design documentation
- system configuration settings and associated documentation
- list of active system accounts along with the name of the individual associated with each account
- list of recently disabled system accounts and the name of the individual associated with each account
- list of conditions for group and role membership
- notifications of recent transfers, separations, or terminations of employees
- access authorization records
- account management compliance reviews
- system monitoring records
- system audit records
- system security plan
- privacy plan
- other relevant documents or records
Interview
- Organizational personnel with account management responsibilities
- system/network administrators
- organizational personnel with information security with information security and privacy responsibilities
Test
- Organizational processes for account management on the system
- mechanisms for implementing account management
Related controls
These relationships come from the official OSCAL catalog. They indicate useful dependencies or context, not automatic inheritance or equivalence.
Related defensive techniques
D3FEND maps this base control or one of its enhancements to the following defensive techniques. The ontology relation label is preserved and does not by itself prove implementation or effectiveness.
MITRE D3FEND™ and the D3FEND logo are trademarks of The MITRE Corporation. Bare Metal Cyber is not affiliated with or endorsed by MITRE.
Related NIST SP 800-171 requirements
These Rev. 3 requirements cite this base control or one of its enhancements as a source. The relationship does not by itself determine contractual applicability or complete implementation.
Related NIST SP 800-172 requirements
These Rev. 3 requirements cite this base control or one of its enhancements as a source. The relationship does not by itself determine contractual applicability or complete implementation.
Control enhancements
Enhancements add specificity, strength, or scope to the base control. Baseline badges show explicit selections in the official SP 800-53B OSCAL profiles.
AC-2(1) — Automated System Account Management
Support the management of system accounts using [Organization-defined: automated mechanisms].
Official discussion
Automated system account management includes using automated mechanisms to create, enable, modify, disable, and remove accounts; notify account managers when an account is created, enabled, modified, disabled, or removed, or when users are terminated or transferred; monitor system account usage; and report atypical system account usage. Automated mechanisms can include internal system functions and email, telephonic, and text messaging notifications.
Organization-defined parameters (1)
Assessment objectives and methods
the management of system accounts is supported using [Organization-defined: automated mechanisms].
Examine
- Access control policy
- procedures for addressing account management
- system design documentation
- system configuration settings and associated documentation
- system audit records
- system security plan
- other relevant documents or records
Interview
- Organizational personnel with account management responsibilities
- system/network administrators
- organizational personnel with information security with information security responsibilities
- system developers
Test
- Automated mechanisms for implementing account management functions
AC-2(2) — Automated Temporary and Emergency Account Management
Automatically [Organization-defined: ac-02.02_odp.01] temporary and emergency accounts after [Organization-defined: time period].
Official discussion
Management of temporary and emergency accounts includes the removal or disabling of such accounts automatically after a predefined time period rather than at the convenience of the system administrator. Automatic removal or disabling of accounts provides a more consistent implementation.
Organization-defined parameters (2)
Assessment objectives and methods
temporary and emergency accounts are automatically [Organization-defined: ac-02.02_odp.01] after [Organization-defined: time period].
Examine
- Access control policy
- procedures for addressing account management
- system design documentation
- system configuration settings and associated documentation
- system-generated list of temporary accounts removed and/or disabled
- system-generated list of emergency accounts removed and/or disabled
- system audit records
- system security plan
- other relevant documents or records
Interview
- Organizational personnel with account management responsibilities
- system/network administrators
- organizational personnel with information security with information security responsibilities
- system developers
Test
- Automated mechanisms for implementing account management functions
AC-2(3) — Disable Accounts
Disable accounts within [Organization-defined: time period] when the accounts:
- (a)Have expired;
- (b)Are no longer associated with a user or individual;
- (c)Are in violation of organizational policy; or
- (d)Have been inactive for [Organization-defined: time period].
Official discussion
Disabling expired, inactive, or otherwise anomalous accounts supports the concepts of least privilege and least functionality which reduce the attack surface of the system.
Organization-defined parameters (2)
Assessment objectives and methods
- AC-02(03)(a)accounts are disabled within [Organization-defined: time period] when the accounts have expired;
- AC-02(03)(b)accounts are disabled within [Organization-defined: time period] when the accounts are no longer associated with a user or individual;
- AC-02(03)(c)accounts are disabled within [Organization-defined: time period] when the accounts are in violation of organizational policy;
- AC-02(03)(d)accounts are disabled within [Organization-defined: time period] when the accounts have been inactive for [Organization-defined: time period].
Examine
- Access control policy
- procedures for addressing account management
- system security plan
- system design documentation
- system configuration settings and associated documentation
- system-generated list of accounts removed
- system-generated list of emergency accounts disabled
- system audit records
- system security plan
- other relevant documents or records
Interview
- Organizational personnel with account management responsibilities
- system/network administrators
- organizational personnel with information security responsibilities
- system developers
Test
- Mechanisms for implementing account management functions
AC-2(4) — Automated Audit Actions
Automatically audit account creation, modification, enabling, disabling, and removal actions.
Official discussion
Account management audit records are defined in accordance with [AU-02](#au-2) and reviewed, analyzed, and reported in accordance with [AU-06](#au-6).
Assessment objectives and methods
- AC-02(04)[01]account creation is automatically audited;
- AC-02(04)[02]account modification is automatically audited;
- AC-02(04)[03]account enabling is automatically audited;
- AC-02(04)[04]account disabling is automatically audited;
- AC-02(04)[05]account removal actions are automatically audited.
Examine
- Access control policy
- procedures addressing account management
- system design documentation
- system configuration settings and associated documentation
- notifications/alerts of account creation, modification, enabling, disabling, and removal actions
- system audit records
- system security plan
- other relevant documents or records
Interview
- Organizational personnel with account management responsibilities
- system/network administrators
- organizational personnel with information security responsibilities
Test
- Automated mechanisms implementing account management functions
Related controls
AC-2(5) — Inactivity Logout
Require that users log out when [Organization-defined: time period of expected inactivity or description of when to log out].
Official discussion
Inactivity logout is behavior- or policy-based and requires users to take physical action to log out when they are expecting inactivity longer than the defined period. Automatic enforcement of inactivity logout is addressed by [AC-11](#ac-11).
Organization-defined parameters (1)
Assessment objectives and methods
users are required to log out when [Organization-defined: time period of expected inactivity or description of when to log out].
Examine
- Access control policy
- procedures addressing account management
- system design documentation
- system configuration settings and associated documentation
- security violation reports
- system audit records
- system security plan
- other relevant documents or records
Interview
- Organizational personnel with account management responsibilities
- system/network administrators
- organizational personnel with information security responsibilities
- users that must comply with inactivity logout policy
Related controls
AC-2(6) — Dynamic Privilege Management
Implement [Organization-defined: dynamic privilege management capabilities].
Official discussion
In contrast to access control approaches that employ static accounts and predefined user privileges, dynamic access control approaches rely on runtime access control decisions facilitated by dynamic privilege management, such as attribute-based access control. While user identities remain relatively constant over time, user privileges typically change more frequently based on ongoing mission or business requirements and the operational needs of organizations. An example of dynamic privilege management is the immediate revocation of privileges from users as opposed to requiring that users terminate and restart their sessions to reflect changes in privileges. Dynamic privilege management can also include mechanisms that change user privileges based on dynamic rules as opposed to editing specific user profiles. Examples include automatic adjustments of user privileges if they are operating out of their normal work times, if their job function or assignment changes, or if systems are under duress or in emergency situations. Dynamic privilege management includes the effects of privilege changes, for example, when there are changes to encryption keys used for communications.
Organization-defined parameters (1)
Assessment objectives and methods
[Organization-defined: dynamic privilege management capabilities] are implemented.
Examine
- Access control policy
- procedures addressing account management
- system design documentation
- system configuration settings and associated documentation
- system-generated list of dynamic privilege management capabilities
- system audit records
- system security plan
- other relevant documents or records
Interview
- Organizational personnel with account management responsibilities
- system/network administrators
- organizational personnel with information security responsibilities
- system developers
Test
- system or mechanisms implementing dynamic privilege management capabilities
Related controls
AC-2(7) — Privileged User Accounts
- (a)Establish and administer privileged user accounts in accordance with [Organization-defined: ac-02.07_odp];
- (b)Monitor privileged role or attribute assignments;
- (c)Monitor changes to roles or attributes; and
- (d)Revoke access when privileged role or attribute assignments are no longer appropriate.
Official discussion
Privileged roles are organization-defined roles assigned to individuals that allow those individuals to perform certain security-relevant functions that ordinary users are not authorized to perform. Privileged roles include key management, account management, database administration, system and network administration, and web administration. A role-based access scheme organizes permitted system access and privileges into roles. In contrast, an attribute-based access scheme specifies allowed system access and privileges based on attributes.
Organization-defined parameters (1)
Assessment objectives and methods
- AC-02(07)(a)privileged user accounts are established and administered in accordance with [Organization-defined: ac-02.07_odp];
- AC-02(07)(b)privileged role or attribute assignments are monitored;
- AC-02(07)(c)changes to roles or attributes are monitored;
- AC-02(07)(d)access is revoked when privileged role or attribute assignments are no longer appropriate.
Examine
- Access control policy
- procedures addressing account management
- system design documentation
- system configuration settings and associated documentation
- system-generated list of privileged user accounts and associated roles
- records of actions taken when privileged role assignments are no longer appropriate
- system audit records
- audit tracking and monitoring reports
- system monitoring records
- system security plan
- other relevant documents or records
Interview
- Organizational personnel with account management responsibilities
- system/network administrators
- organizational personnel with information security responsibilities
Test
- Mechanisms implementing account management functions
- mechanisms monitoring privileged role assignments
AC-2(8) — Dynamic Account Management
Create, activate, manage, and deactivate [Organization-defined: system accounts] dynamically.
Official discussion
Approaches for dynamically creating, activating, managing, and deactivating system accounts rely on automatically provisioning the accounts at runtime for entities that were previously unknown. Organizations plan for the dynamic management, creation, activation, and deactivation of system accounts by establishing trust relationships, business rules, and mechanisms with appropriate authorities to validate related authorizations and privileges.
Organization-defined parameters (1)
Assessment objectives and methods
- AC-02(08)[01][Organization-defined: system accounts] are created dynamically;
- AC-02(08)[02][Organization-defined: system accounts] are activated dynamically;
- AC-02(08)[03][Organization-defined: system accounts] are managed dynamically;
- AC-02(08)[04][Organization-defined: system accounts] are deactivated dynamically.
Examine
- Access control policy
- procedures addressing account management
- system design documentation
- system configuration settings and associated documentation
- system-generated list of system accounts
- system audit records
- system security plan
- other relevant documents or records
Interview
- Organizational personnel with account management responsibilities
- system/network administrators
- organizational personnel with information security responsibilities
- system developers
Test
- Automated mechanisms implementing account management functions
Related controls
AC-2(9) — Restrictions on Use of Shared and Group Accounts
Only permit the use of shared and group accounts that meet [Organization-defined: conditions].
Official discussion
Before permitting the use of shared or group accounts, organizations consider the increased risk due to the lack of accountability with such accounts.
Organization-defined parameters (1)
Assessment objectives and methods
the use of shared and group accounts is only permitted if [Organization-defined: conditions] are met.
Examine
- Access control policy
- procedures addressing account management
- system design documentation
- system configuration settings and associated documentation
- system-generated list of shared/group accounts and associated roles
- system audit records
- system security plan
- other relevant documents or records
Interview
- Organizational personnel with account management responsibilities
- system/network administrators
- organizational personnel with information security responsibilities
Test
- Mechanisms implementing management of shared/group accounts
AC-2(10) — Shared and Group Account Credential Change
This enhancement is marked withdrawn in the official OSCAL catalog. Related-control metadata below may identify where its intent was incorporated.
AC-2(11) — Usage Conditions
Enforce [Organization-defined: circumstances and/or usage conditions] for [Organization-defined: system accounts].
Official discussion
Specifying and enforcing usage conditions helps to enforce the principle of least privilege, increase user accountability, and enable effective account monitoring. Account monitoring includes alerts generated if the account is used in violation of organizational parameters. Organizations can describe specific conditions or circumstances under which system accounts can be used, such as by restricting usage to certain days of the week, time of day, or specific durations of time.
Organization-defined parameters (2)
Assessment objectives and methods
[Organization-defined: circumstances and/or usage conditions] for [Organization-defined: system accounts] are enforced.
Examine
- Access control policy
- procedures addressing account management
- system design documentation
- system configuration settings and associated documentation
- system-generated list of system accounts and associated assignments of usage circumstances and/or usage conditions
- system audit records
- system security plan
- other relevant documents or records
Interview
- Organizational personnel with account management responsibilities
- system/network administrators
- organizational personnel with information security responsibilities
- system developers
Test
- Mechanisms implementing account management functions
AC-2(12) — Account Monitoring for Atypical Usage
- (a)Monitor system accounts for [Organization-defined: atypical usage] ; and
- (b)Report atypical usage of system accounts to [Organization-defined: personnel or roles].
Official discussion
Atypical usage includes accessing systems at certain times of the day or from locations that are not consistent with the normal usage patterns of individuals. Monitoring for atypical usage may reveal rogue behavior by individuals or an attack in progress. Account monitoring may inadvertently create privacy risks since data collected to identify atypical usage may reveal previously unknown information about the behavior of individuals. Organizations assess and document privacy risks from monitoring accounts for atypical usage in their privacy impact assessment and make determinations that are in alignment with their privacy program plan.
Organization-defined parameters (2)
Assessment objectives and methods
- AC-02(12)(a)system accounts are monitored for [Organization-defined: atypical usage];
- AC-02(12)(b)atypical usage of system accounts is reported to [Organization-defined: personnel or roles].
Examine
- Access control policy
- procedures addressing account management
- system design documentation
- system configuration settings and associated documentation
- system monitoring records
- system audit records
- audit tracking and monitoring reports
- privacy impact assessment
- system security plan
- privacy plan
- other relevant documents or records
Interview
- Organizational personnel with account management responsibilities
- system/network administrators
- organizational personnel with information security responsibilities
Test
- Mechanisms implementing account management functions
Related controls
AC-2(13) — Disable Accounts for High-risk Individuals
Disable accounts of individuals within [Organization-defined: time period] of discovery of [Organization-defined: significant risks].
Official discussion
Users who pose a significant security and/or privacy risk include individuals for whom reliable evidence indicates either the intention to use authorized access to systems to cause harm or through whom adversaries will cause harm. Such harm includes adverse impacts to organizational operations, organizational assets, individuals, other organizations, or the Nation. Close coordination among system administrators, legal staff, human resource managers, and authorizing officials is essential when disabling system accounts for high-risk individuals.
Organization-defined parameters (2)
Assessment objectives and methods
accounts of individuals are disabled within [Organization-defined: time period] of discovery of [Organization-defined: significant risks].
Examine
- Access control policy
- procedures addressing account management
- system design documentation
- system configuration settings and associated documentation
- system-generated list of disabled accounts
- list of user activities posing significant organizational risk
- system audit records
- system security plan
- other relevant documents or records
Interview
- Organizational personnel with account management responsibilities
- system/network administrators
- organizational personnel with information security responsibilities
Test
- Mechanisms implementing account management functions
Related controls
Authoritative sources
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