"Victims first have to be tricked into downloading and opening a disk image file, running the installer app inside, and clicking through OS X's are-you-sure-you-want-to-run-untrusted-things-from-the-internet warnings. Then the software uses the escalation-of-privilege bug to silently install adware and other junk."
Well, you have to be gullible enough to install something from a website. Which means that you have to enter your Admin password.
Unfortunately there are a fair number of gullible people out there. If you have gullible users, don't give them an Admin account and they can't install the malware.
Or run Mac Antivirus (there are a number of them out there, some free as on Windows). The virus definition files are tiny though.
I'm quite familiar with this kind of exploit.
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