Title

The Kerberos service ticket maximum lifetime must be limited to 600 minutes or less. (Cat II impact)

Discussion

This setting determines the maximum amount of time (in minutes) that a granted session ticket can be used to access a particular service. Session tickets are used only to authenticate new connections with servers. Ongoing operations are not interrupted if the session ticket used to authenticate the connection expires during the connection.

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 value for "Maximum lifetime for service ticket" is "0" or greater than "600" minutes, 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 service ticket" to a maximum of "600" minutes, but not "0" which equates to "Ticket doesn't expire".

Additional Identifiers

Rule ID: SV-28497r2_rule

Vulnerability ID: V-2377

Group Title: Kerberos-Service Ticket Lifetime

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.