Outdated or unused accounts must be removed from the system or disabled.

From Windows 2008 Domain Controller Security Technical Implementation Guide

Part of Dormant Accounts

Associated with: CCI-000795

SV-29482r2_rule Outdated or unused accounts must be removed from the system or disabled.

Vulnerability discussion

Outdated or unused accounts provide penetration points that may go undetected. Inactive accounts must be deleted if no longer necessary or, if still required, disabled until needed.

Check content

Member servers and standalone systems: Run the DumpSec utility. Select "Dump Users as Table" from the "Report" menu. Select the following fields, and click "Add" for each entry: UserName SID LastLogonTime AcctDisabled Review the "LastLogonTime" to determine if any accounts have not been logged on to within the past 35 days. Domain Controllers: Open a Command Prompt Enter "Dsquery user -limit 0 -inactive 5 -o rdn". A list of user accounts that have been inactive for 5 weeks will be displayed. Disabled Accounts can be determined by using the following: Enter "Dsquery user -limit 0 -disabled -o rdn". Review the list of accounts returned by DumpSec or the above query to determine the finding validity for each account reported. The following accounts are exempt: Built-in administrator account (SID ending in 500) Built-in guest account (SID ending in 501) Application accounts If any enabled accounts have not been logged on to within the past 35 days, this is a finding. Inactive accounts that have been reviewed and deemed to be required must be documented with the ISSO.

Fix text

Regularly review accounts to determine if they are still active. Remove or disable accounts that have not been used in the last 35 days.

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