The operating system must automatically remove or disable temporary user accounts after 72 hours.

From Apple OS X 10.9 (Mavericks) Workstation Security Technical Implementation Guide

Part of SRG-OS-000002

Associated with: CCI-000016

SV-72713r1_rule The operating system must automatically remove or disable temporary user accounts after 72 hours.

Vulnerability discussion

If temporary user accounts remain active when no longer needed or for an excessive period, these accounts may be targeted by attackers to gain unauthorized access. To mitigate this risk, automated termination of all temporary accounts must be set upon account creation. Temporary accounts are established as part of normal account activation procedures when there is a need for short-term accounts without the demand for immediacy in account activation. If temporary accounts are used, the operating system must be configured to automatically terminate these types of accounts after a DoD-defined time period of 72 hours.To address access requirements, many operating systems may be integrated with enterprise level authentication/access mechanisms that meet or exceed access control policy requirements.

Check content

If a temporary user has been created on the workstation, check the expiration settings using the following command, substituting the correct user name in place of username: sudo pwpolicy -u username get-effective-policy | tr ' ' '\n' | grep 'usingHardExpirationDate\|hardExpireDateGMT' The value of 'usingHardExpirationDate' should be '1', and the value for the 'hardExpireDateGMT' should be a valid date. If they are not set correctly, and password policy is not controlled by a directory server, this is a finding.

Fix text

To set an expiration date for a temporary account, use the following command, substituting the correct user name in place of username: sudo pwpolicy -u username setpolicy 'usingHardExpirationDate=1 hardExpireDateGMT=mm/dd/yy'

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