Researchers have developed a side-channel exploit for Apple CPUs, enabling sophisticated attackers to extract sensitive information from browsers.

Side-channel attacks are usually overlooked, often physical counterparts to traditional software hacks. Rather than an unsecured password or a vulnerability in a program, they take advantage of the extra information a computer system or hardware generates — in the form of sound, light, or electromagnetic radiation, for example, or in the time it takes to complete certain computations (a timing attack).