You can tell folks that OS-X Mavericks 10.9.2 is released for update, containing the fix.
Earlier releases of OS-X (Mountain Lion 10.8 and earlier) were not affected by the flaw and do not require update.
Looks like this tempest is over. The techblog headline writers who jizz in their pants while writing "Apple" and "Security Flaw" in the same line can now go back to writing about Windows XP's imminent death, waiting for the next batch of Windows Updates, or whatever they do in normal life.
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