Update your iPhone: Apple releases critical software fix

Apple released a critical software patch to fix a security vulnerability that researchers said could allow hackers to directly infect iPhones and other Apple devices without any user action.

Researchers at the University of Toronto's Citizen Lab said the security issue was exploited to plant spyware on a Saudi activist's iPhone. They said they had high confidence that the world's most infamous hacker-for-hire firm, Israel's NSO Group, was behind that attack. The previously unknown vulnerability affected all major Apple devices -- iPhones, Macs and Apple Watches, the researchers said. NSO Group responded with a one-sentence statement saying it will continue providing tools for fighting "terror and crime." It was the first time a so-called "zero-click" exploit -- one that doesn't require users to click on suspect links or open infected files -- has been caught and analyzed, the researchers said. They found the malicious code on Sept. 7 and immediately alerted Apple. The targeted activist asked to remain anonymous, they said. "We're not necessarily attributing this attack to the Saudi government," said researcher Bill Marczak.