Eureka! Mac's Are Not Invulnerable:
"The truth is that the Mac OS is just as vulnerable as Microsoft Windows. Overall, maybe OS X is better than Windows, but that's not the point. Panther, for example, is a great OS, but it's also complex, and complexity leaves room for gaps—some small, some not.

OS X 10.x may not be as widely used as Windows (let's face it, it isn't) but some of its devotees seem far more fanatical than Windows users. Those who toil in Windows—me, for instance—care about their OS to a certain degree, but hardly feel the need to jump to its defense or come up with ridiculous conspiracy theories to explain why, say, Bob bombed or Windows Me stank."

When Microsoft released Windows 95 three years and some months later, for the first time there was a degree of parity between the graphical interfaces. I found things to grumble about, but they were minor. Microsoft's less-than-stellar OS security took a while to become apparent. In fact, the problem wasn't epidemic until a few years after the Internet took off. Windows' market domination makes it a target for the virus authoring community. The OS also bears the burden of user wrath because those who depend on Windows so often feel let down. But nothing drives me crazier than Mac true believers shaking their heads and grinning at me every time another Windows virus hits. This past summer was particularly difficult. As Blaster and SoBig wreaked havoc across the Internet and with millions of Windows PCs, Mac users would tell me with mock sympathy, "This wouldn't happen if we all ran Macs".

We don't, of course, and again, that's the point. The discovery of this OS X security hole will be like a tree falling in a particularly remote forest. So few people actually use Macs (notwithstanding, of course, what you see in the alternate universe of movies, where everyone appears to use them), that I think it's unlikely this problem will have any long-term effect. Hackers are unlikely to exploit this hole the way they have Windows failings.

If the Macintosh OS ever became dominant, the tables would turn, and there would be just as many reports of viruses, security holes, and attacks on it as we currently have with Windows. As one Macophile I spoke with noted, no one has even bothered to exploit this security flaw. I doubt anyone will. Meanwhile, we can already see what happens when Apple has a broadly popular product that cuts across platforms. The Apple iPod is the number one MP3 player, and now that its companion computer utility, iTunes, is available for both the Mac and the PC, it has become a hack target. In fact, Jon Lech Johansen, the same Norwegian who cracked the DVD security code, recently circumvented the iTunes music protection scheme. An event like that occurring makes sense to me, since iTunes' popularity makes it a target worth hacking—and whatever mystical Mac mojo there may be, it didn't go far in protecting a popular Apple product.…

http://www.pcmag.com/article2/0,4149,1408924,00.asp