The Kerberos policy user ticket renewal maximum lifetime must be limited to 7 days or less.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
WN12-AC-000013-DC	WN12-AC-000013-DC	WN12-AC-000013-DC_rule		Medium

Description
This setting determines the period of time (in days) during which a user's TGT may be renewed. This security configuration limits the amount of time an attacker has to crack the TGT and gain access.

STIG	Date
Microsoft Windows Server 2012 Domain Controller Security Technical Implementation Guide	2013-07-25

Details

Check Text ( C-WN12-AC-000013-DC_chk )
Verify the following is configured in the Default Domain Policy. Open "Group Policy Management". Navigate to "Group Policy Objects" in the Domain being reviewed (Forest > Domains > Domain). Right click on the "Default Domain Policy". Select Edit. Navigate to Computer Configuration > Policies > Windows Settings > Security Settings > Account Policies > Kerberos Policy. If the "Maximum lifetime for user ticket renewal" is greater than 7 days, this is a finding.

Check Text ( C-WN12-AC-000013-DC_chk )

Verify the following is configured in the Default Domain Policy.

Open "Group Policy Management".
Navigate to "Group Policy Objects" in the Domain being reviewed (Forest > Domains > Domain).
Right click on the "Default Domain Policy".
Select Edit.
Navigate to Computer Configuration > Policies > Windows Settings > Security Settings > Account Policies > Kerberos Policy.

If the "Maximum lifetime for user ticket renewal" is greater than 7 days, this is a finding.

Fix Text (F-WN12-AC-000013-DC_fix)
Configure the policy value in the Default Domain Policy for Computer Configuration -> Policies -> Windows Settings -> Security Settings -> Account Policies -> Kerberos Policy -> "Maximum lifetime for user ticket renewal" to a maximum of 7 days or less.