The orig. ref. was in the Unix Time Sharing paper. See Section 3.5 near the end.
https://people.eecs.berkeley.edu/~brewer/cs262/unix.pdf

The paper referenced above is behind a paywall (you can see the first page *free of charge*!)
https://onlinelibrary.wiley.com/doi/abs/10.1002/spe.4380010210

One place the problem is described in some detail:
https://www.cs.unm.edu/~cris/481/gordon-moo.txt:


On Jan 28, 2020, at 2:18 PM, Dave Horsfall <dave@horsfall.org> wrote:

I recall reading in an old manpage that the (patented) set-uid bit was to solved the MOO problem.  I've searched around, but cannot find anything relevant.  Anyone know?

-- Dave
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