The Cupertino based company just released the long awaited update of the operating system iOS 4.2.1 for the iPhone, iPad and iPod Touch. While it brings many changes mainly for iPad owners like multitasking, app folders and so on, it is more than just these more or less cosmetic fixes.
It is a full-blown security update which closes plenty of security holes especially in Webkit – the foundation of the Safari web browser. These vulnerabilities allow attackers for example to dial out without user knowledge to costly numbers or to take over complete control of the iPhone/iPad/iPod Touch. A post on Apple’s security announcement list contains a lengthy list of security vulnerabilities fixed with iOS 4.2.1.
Thus owners and users of an iPad, iPhone or iPod Touch are strongly recommended to apply the update as soon as possible. The danger of an attack is significantly increased since meanwhile the source code of the greenp0ison hack to unlock and root the iP*-devices has been published by their developers and greatly simplifies the programming of according hacks.