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

From Windows Server 2008 R2 Domain Controller Security Technical Implementation Guide

Associated with: CCI-000366

SV-36182r2_rule The Kerberos user ticket renewal maximum lifetime must be limited to 7 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.

Check content

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 "7" days or less.

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