A flaw was found in MIT krb5 1.6 or later, an authenticated kadmin user with permission to add principals to an LDAP Kerberos database can circumvent a DN containership check by supplying both a "linkdn" and "containerdn" database argument, or by supplying a DN string which is a left extension of a container DN string but is not hierarchically within the container DN.
Created krb5 tracking bugs for this issue:
Affects: fedora-all [bug 1551087]
This is identical to https://bugzilla.redhat.com/show_bug.cgi?id=1535575
This issue has been addressed in the following products:
Red Hat Enterprise Linux 7
Via RHSA-2018:3071 https://access.redhat.com/errata/RHSA-2018:3071