Apple's Zero day flaw is no more.
It also addresses 19 other issues in OS X, including improving security against worms which have just recently begun to slither through Apple's core.https://o1.qnsr.com/log/p.gif?;n=203;c=204650394;s=9477;x=7936;f=201801171506010;u=j;z=TIMESTAMP;a=20392931;e=i The zero-day issue involved how OS X 10.4.5 handles ZIP archives in the Safari Web browser. Arbitrary commands could have potentially been executed automatically via Safari from a malicious site.
Though the issue remained open for over a week, there was simple workaround provided early on that involved disabling automatic file opening on downloads in Safari, or simply using another browser.
Apple's security update also revealed a number of other significant flaws in Safari that are now fixed with the patch.