One of the citations, http://catless.ncl.ac.uk/Risks/4.73.html#subj10.1 has more information about the incident, and some interesting insight from Mr. Hubbard.

  "I have to wonder what other RPC services are open holes. We've managed to do some interesting, unauthorized, things with the YP service here at Berkeley, I wonder what the implications of this are."

Some early reflections on "Wow, these very complex and mostly unprotected directory services are just sitting open to anyone connected to the Internet to access! Gee, I hope someone doesn't abuse YP/AD/SMB/DNS down the line..."