I do not think so, but I may not fully understand what "subtree"
implies.

The realm was initially created with a command equivalent to:

kdb5_ldap_util -D cn=admin,dc=example,dc=com create -subtrees
dc=example,dc=com -r TEST.EXAMPLE.COM -s -H
ldap://ldapserver.example.com

with user entries like:
dn: uid=testuser,ou=People,dc=example,dc=com

I explicitly added the ou=People,dc=example,dc=com with "kdb5_ldap_util
... modify -subtrees ...", but that did not help. Setting sscope to 2
also did nothing.

I can add a principal without specifying dn, but that leads to an entry like:
dn: 
krbPrincipalName=testu...@test.example.com,cn=TEST.EXAMPLE.COM,cn=krb5,dc=example,dc=com

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https://bugs.launchpad.net/bugs/1817955

Title:
  Getting new "DN is out of the realm subtree" error on adding principal

Status in krb5 package in Ubuntu:
  New

Bug description:
  Recently applied security update to 14.04.5 LTS kerberos (1.12+dfsg-
  2ubuntu5.4), and started getting errors when adding new principals to
  LDAP.

  Obfuscated example:

  kadmin.local -q "ank -x
  dn=\"uid=testuser,ou=People,dc=example,dc=com\" -pw \"dummypass\"
  testuser"

  now gives:
  Authenticating as principal root/ad...@test.example.com with password.
  NOTICE: no policy specified for testu...@test.example.com; assigning "default"
  add_principal: DN is out of the realm subtree while creating 
"testu...@test.example.com".

  
  This worked up through 1.12+dfsg-2ubuntu5.3, and I think it now fails due to 
changes in src/plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c in response to 
CVE-2018-5729 or CVE-2018-5730.

  I'm going to attempt a downgrade to 1.12+dfsg-2ubuntu5.3 to check.

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