.... That has security experts warning of trouble, following revelations that Apple built the iPhone's firmware on the same flawed security model that took rival Microsoft a decade to eliminate from Windows.
"It really is an example of 'those who don't learn from history are condemned to repeat it'," says Dan Geer, vice president and chief scientist at security firm Verdasys...
It wasn't long after Apple released the iPhone in June that researchers discovered that every application on the device -- from the calculator on up -- runs as "root," i.e., with full system privileges. As a result, a serious vulnerability in any of these applications would allow hackers to gain complete control of the device.
The same problem in Windows played a big role in stoking a plague of internet malware-production that began with the Melissa virus in 1999, and continues with the malicious Storm worm today....
Lots more here:
http://www.wired.com/politics/security/news/2007/10/iphone_windows