An improved attack on the firmware in Apple computers makes them vulnerable to hard-to-detect malware. The new research highlights ongoing weaknesses in the low-level software that runs on every computer. Malware that sits within firmware is particularly dangerous since security products don’t check the integrity of firmware, meaning users would have no idea it has been tampered with. Attack uses several vulnerabilities in firmware used by Apple, but some remain, researcher says. The attack could be used to reach computers that have been isolated for security reasons.”]