It could be real... I have always tempered my advice with "yet..." I have never said, as for-q-clinton claims, that it was impossible. The Macs have YET to be breached. This may be the first successful attempt. But I am not seeing the real world evidence that there are THAT MANY infected Macs out there.
EVERY exploit used against the Mac in CANSEC West has been a JAVA exploit through Safari. Every single one an exploit that Sun did not know about as well. That is why Apple dropped Java as a default inclusion of the installation more than two years ago for OSX Snow Leopard and Lion. Even before, it was an optional install, one of the reasons I have my doubts about the large numbers they are claiming for the infected Macs. Now, if you want Java, you have to download it as a free app from the OSX App Store! Javascript is OK and is still included.
The easiest method of protection from this exploit is to go into Safari and FireFox and any other browser you run's preferences and turn off JAVA. Done. Safe. No body needs JAVA to run for surfing the Internet.
Then, the only other vulnerable Mac users are those that have automatic updates turned off. They don't get the pushed security updates when they are ready, or the new Trojan definitions that come out every 24 hours or sooner as necessary. But you can't protect the terminally stupid... they took a deliberate step to TURN OFF the updates. Why? I haven't got a clue.
Ah, would that it were that easy!
Java is required by all the Citrix tools we use everyday at work (and I use from home) -- GoToMeeting, GoToWebinar, GoToMyPC/Mac.
It's also required for talking to the Cisco firewalls, routers, switches, etc. in my networks. And it is worse yet -- the poorly written Cisco code in some of the units requires OLD versions of Java!!! Newer Java versions throw errors on some of the device code.
*SIGH*
Granted, that might be atypical for average home users, but it's not uncommon for tech professionals and business users who rely on communications software like GoToMeeting. A surprising amount of stuff is written with the Java environment in mind.