From Windows Server 2012/2012 R2 Domain Controller Security Technical Implementation Guide
Part of Kerberos-User Ticket Renewal
Associated with IA controls: ECSC-1
Associated with: CCI-000366
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.
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.
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.
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