Title

The Kerberos policy user ticket renewal maximum lifetime must be limited to 7 days or less. (Cat II impact)

Discussion

This setting determines the period of time (in days) during which a user's 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 a maximum of 7 days or less.

Additional Identifiers

Rule ID: SV-226068r794388_rule

Vulnerability ID: V-226068

Group Title: SRG-OS-000480-GPOS-00227

Expert Comments

CCIs tied to check.

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