CVE-2018-5741

Vendor solution

At the time of public disclosure, ISC is not providing any code changing the behavior of the update-policy feature. While we believe that there are a few operators out there who are relying on the strictest interpretation permitted by the erroneous documentation, we have to balance that against changing the behavior of features in stable branches of BIND, including the 9.11 branch which is meant to be a feature-complete Extended Support Version of BIND 9. As a compromise between these conflicting priorities, we have decided that our best course of action is to disclose the error but leave the existing behavior of the krb5-subdomain and ms-subdomain policies as they are (while correcting the erroneous documentation).

In maintenance releases issued during or after October 2018, the name field for ms-subdomain and krb5-subdomain will be corrected so that names lower than "." can be configured, and two new rule types will be added, krb5-selfsub and ms-selfsub, analogous to the existing selfsub rule type, which implement the behavior that was formerly described in the documentation for krb5-subdomain and ms-subdomain: restricting updates to names at or below the machine name encoded in the client's Windows or Kerberos principal.