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IA.3.085
Content
Control Acronym
IA
Family
Identification And Authentication
CMMC Level
3
800-171 Control #
3.5.5
CMMC Description
Prevent the reuse of identifiers for a defined period.
CMMC Clarification
Identifiers uniquely associate a user ID to an individual, group, role or device. Establish guidelines and implement mechanisms to prevent identifiers from being reused for the period of time established by the organization in the policy. Example As the IT administrator for your organization you maintain a central directory/domain that holds user accounts and computers within the organization. As part of your job you issue unique usernames (joe@acme.com) for the staff to access resources. When you issue staff computers you also rename the computer to reflect to whom it is assigned (joe-laptop01). Joe has recently left the organization so you must manage the former staff member’s account. Incidentally, the replacement is also named Joe. In the directory you do not assign the previous account to the new user. You create an account called joe02. This account is assigned the appropriate permissions for the new user. A new laptop is also provided with the identifier of joe02-laptop01.
800-171 Description
Prevent reuse of identifiers for a defined period.
800-171 Discussion
Identifiers are provided for users, processes acting on behalf of users, or devices (3.5.1). Preventing reuse of identifiers implies preventing the assignment of previously used individual, group, role, or device identifiers to different individuals, groups, roles, or devices.
Other Source Discussion
N/A
CIS Control References
CIS Controls v7.1 16.7, 16.10, 16.12
NIST 800-53 Control Ref.
NIST SP 800-53 Rev 4 IA-4
CMMC Derived
NIST CSF Control References
NIST 800-171 References
NIST SP 800-171 Rev 1 3.5.5
Applicable FAR Clause
NIST CSF Control Reference
NIST CSF v1.1 PR.AC-1, PR.AC-6, PR.AC-7
CERT RMM Reference
Modification of NIST 800-171B Reference
NIST 800-171B Reference
UK NCSCCyber Reference
AS ACSC Reference
Sub-Criterias
Assessment Sub-Criteria 1
IA.3.085.[a] a period within which identifiers cannot be reused is defined; and
Assessment Sub-Criteria 2
IA.3.085.[b] reuse of identifiers is prevented within the defined period.