Apple unveils iOS 4.3 but ignores older iPhones

iOS updated but older iPhone and iPod touch models left vulnerable to attack, says Sophos...

Apple has released the latest update of its mobile operating system, iOS 4.3, which is available for download on the iPad, iPhone and iPod touch.

The update features improved Safari mobile browsing using the Nitro JavaScript engine, and iTunes Home Sharing as well as extra security features.

Apple's latest update to iOS introduces iTunes Home Sharing and improvements to security and browsingPhoto: Chris Harrison

iTunes Home Sharing allows iOS 4.3 users to access music, films and TV programmes on their iPad, iPhone or iPod from their iTunes library on a Mac or PC via wi-fi. iOS 4.3 also includes enhancements to AirPlay, the technology that lets users stream music wirelessly.

The upgrade is compatible only with the iPhone 3GS and later, and the third-generation iPod touch or later. This restriction leaves older models of the iPhone and iPod touch vulnerable to hacker attacks, according to IT security and control firm Sophos.

In a statement, Sophos said the iOS update contains "critical" security patches, including protection against maliciously crafted Tiff image files and multiple memory corruption issues in WebKit which cause issues when users visit a booby-trapped website.

Without access to this update, Sophos argues Apple is leaving some of its mobile devices unprotected against vulnerabilities, which could lead to malicious code being run on the devices.

Graham Cluley, senior technology consultant at Sophos, warned that people with older models of the iPhone and iPod touch should seriously consider upgrading their device: "If you were looking for an excuse to upgrade your iPhone or iPod touch, maybe you've just been given a good one by Apple.

"If you were happy with your iPhone 3G," he conceded, "I doubt you're feeling too good about having to reach into your pocket".

iOS 4.3 is available as a free download from Friday 11 March.