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

From Windows Server 2016 Security Technical Implementation Guide

Associated with: CCI-001941 CCI-001942

SV-88017r1_rule The Kerberos policy user ticket renewal maximum lifetime must be limited to seven days or less.

Vulnerability discussion

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

Check content

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

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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