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Windows Server 2019 Kerberos policy user ticket renewal maximum lifetime must be limited to seven days or less.


Overview

Finding ID Version Rule ID IA Controls Severity
V-93449 WN19-DC-000050 SV-103535r1_rule Medium
Description
This setting determines the period of time (in days) during which a user's Ticket Granting Ticket (TGT) may be renewed. This security configuration limits the amount of time an attacker has to crack the TGT and gain access. Satisfies: SRG-OS-000112-GPOS-00057, SRG-OS-000113-GPOS-00058
STIG Date
Windows Server 2019 Security Technical Implementation Guide 2020-06-15

Details

Check Text ( C-92765r1_chk )
This applies to domain controllers. It is NA for other systems.

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-99693r1_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.