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
V-2379	WN12-AC-000013-DC	SV-51166r2_rule	ECSC-1	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
Windows Server 2012 / 2012 R2 Domain Controller Security Technical Implementation Guide	2016-06-08

Details

Check Text ( C-46593r1_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-46593r1_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-44324r1_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.