Title

The Kerberos service ticket maximum lifetime must meet minimum standards. (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

Analyze the system using the Security Configuration and Analysis snap-in. Expand the Security Configuration and Analysis tree view. Navigate to 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 Kerberos policy option “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-28496r1_rule

Vulnerability ID: V-2377

Group Title:

Expert Comments

CCIs tied to check.

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