This sort of malware is commonplace, with examples existing for Windows XP, Windows Vista, Windows 7 and even Mac OS X.

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The iTunes vulnerabilities were spotted by Kaspersky on the Mac OSX v10.5 and later, Windows 7, Vista, and Windows XP SP2.

FORBES: Apple's iTunes, QuickTime, High On Cyber Security Vulnerability List, Kasperky Lab Says

"I'm a Mac user, but on my Mac I have multiple instances of Windows--XP, Vista, very old Windows stuff and the very latest stuff, like Windows Server 2008, " he says.

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In contrast, Apple's ads have neatly-wrapped cutting attacks on Windows Vista in a humorous schtick that depicts the PC user as a fumbling fuddy-duddy and the Mac user as worldy, wise and hip.

FORBES: SiliConsumed