+AC-20 [M] Use of External Systems
---+AC-20(01) [M] Limits on Authorized Use
---+AC-20(02) [M] Portable Storage Devices — Restricted Use
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AC-20 [M] Use of External Systems
Control
- [Selection(one-or-more): establish {{ insert: param, ac-20_odp.02 }} ; identify {{ insert: param, ac-20_odp.03 }} ] , consistent with the trust relationships established with other organizations owning, operating, and/or maintaining external systems, allowing authorized individuals to:
- Access the system from external systems; and
- Process, store, or transmit organization-controlled information using external systems; or
- Prohibit the use of [Assignement: prohibited types of external systems].
Discussion
External systems are systems that are used by but not part of organizational systems, and for which the organization has no direct control over the implementation of required controls or the assessment of control effectiveness. External systems include personally owned systems, components, or devices; privately owned computing and communications devices in commercial or public facilities; systems owned or controlled by nonfederal organizations; systems managed by contractors; and federal information systems that are not owned by, operated by, or under the direct supervision or authority of the organization. External systems also include systems owned or operated by other components within the same organization and systems within the organization with different authorization boundaries. Organizations have the option to prohibit the use of any type of external system or prohibit the use of specified types of external systems, (e.g., prohibit the use of any external system that is not organizationally owned or prohibit the use of personally-owned systems).
For some external systems (i.e., systems operated by other organizations), the trust relationships that have been established between those organizations and the originating organization may be such that no explicit terms and conditions are required. Systems within these organizations may not be considered external. These situations occur when, for example, there are pre-existing information exchange agreements (either implicit or explicit) established between organizations or components or when such agreements are specified by applicable laws, executive orders, directives, regulations, policies, or standards. Authorized individuals include organizational personnel, contractors, or other individuals with authorized access to organizational systems and over which organizations have the authority to impose specific rules of behavior regarding system access. Restrictions that organizations impose on authorized individuals need not be uniform, as the restrictions may vary depending on trust relationships between organizations. Therefore, organizations may choose to impose different security restrictions on contractors than on state, local, or tribal governments.
External systems used to access public interfaces to organizational systems are outside the scope of [AC-20](#ac-20) . Organizations establish specific terms and conditions for the use of external systems in accordance with organizational security policies and procedures. At a minimum, terms and conditions address the specific types of applications that can be accessed on organizational systems from external systems and the highest security category of information that can be processed, stored, or transmitted on external systems. If the terms and conditions with the owners of the external systems cannot be established, organizations may impose restrictions on organizational personnel using those external systems.
Assessment Objective
- [Selection(one-or-more): establish {{ insert: param, ac-20_odp.02 }} ; identify {{ insert: param, ac-20_odp.03 }} ] is/are consistent with the trust relationships established with other organizations owning, operating, and/or maintaining external systems, allowing authorized individuals to access the system from external systems (if applicable);
- [Selection(one-or-more): establish {{ insert: param, ac-20_odp.02 }} ; identify {{ insert: param, ac-20_odp.03 }} ] is/are consistent with the trust relationships established with other organizations owning, operating, and/or maintaining external systems, allowing authorized individuals to process, store, or transmit organization-controlled information using external systems (if applicable);
- the use of [Assignement: prohibited types of external systems] is prohibited (if applicable).
Assessment Method
Examine
Access control policy
procedures addressing the use of external systems
external systems terms and conditions
list of types of applications accessible from external systems
maximum security categorization for information processed, stored, or transmitted on external systems
system configuration settings and associated documentation
system security plan
other relevant documents or records
Interview
Organizational personnel with responsibilities for defining terms and conditions for use of external systems to access organizational systems
system/network administrators
organizational personnel with information security responsibilities
1. Panoramica
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Standard |
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AC-20(01) [M] Limits on Authorized Use
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Control
Permit authorized individuals to use an external system to access the system or to process, store, or transmit organization-controlled information only after:- Verification of the implementation of controls on the external system as specified in the organization’s security and privacy policies and security and privacy plans; or
- Retention of approved system connection or processing agreements with the organizational entity hosting the external system.
Discussion
Limiting authorized use recognizes circumstances where individuals using external systems may need to access organizational systems. Organizations need assurance that the external systems contain the necessary controls so as not to compromise, damage, or otherwise harm organizational systems. Verification that the required controls have been implemented can be achieved by external, independent assessments, attestations, or other means, depending on the confidence level required by organizations.
Assessment Objective
- authorized individuals are permitted to use an external system to access the system or to process, store, or transmit organization-controlled information only after verification of the implementation of controls on the external system as specified in the organization’s security and privacy policies and security and privacy plans (if applicable);
- authorized individuals are permitted to use an external system to access the system or to process, store, or transmit organization-controlled information only after retention of approved system connection or processing agreements with the organizational entity hosting the external system (if applicable).
Assessment Method
Examine
Access control policy
procedures addressing the use of external systems
system connection or processing agreements
account management documents
system security plan
other relevant documents or records
Interview
System/network administrators
organizational personnel with information security responsibilities
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AC-20(02) [M] Portable Storage Devices — Restricted Use
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Control
Restrict the use of organization-controlled portable storage devices by authorized individuals on external systems using [Assignement: restrictions].
Discussion
Limits on the use of organization-controlled portable storage devices in external systems include restrictions on how the devices may be used and under what conditions the devices may be used.
Assessment Objective
the use of organization-controlled portable storage devices by authorized individuals is restricted on external systems using [Assignement: restrictions].
Assessment Method
Examine
Access control policy
procedures addressing the use of external systems
system configuration settings and associated documentation
system connection or processing agreements
account management documents
system security plan
other relevant documents or records
Interview
Organizational personnel with responsibilities for restricting or prohibiting the use of organization-controlled storage devices on external systems
system/network administrators
organizational personnel with information security responsibilities
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1.1 Riferimenti
1.2 Requisiti identificati
1.3 Regolamentazioni correlate
2. Requisiti identificati
Requisiti
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Requisito |
3. Regolamentazioni correlate
Regolamentazioni
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Regolamentazione |
Ticket collegati
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