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Version Big Sur 11.3 is available now and contains other fixes besides addressing this bug.

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It affects all recent versions of macOS but Apple has released a patch that prevents the attacks. For anyone still running an unpatched macOS, Wardle’s advice was simple: “Don’t open anything from anybody.” But once that’s done, the malware won’t be stopped installing by the Mac’s defensive tools, though macOS should stop any changes to critical system files and ask the user if the app can access photos, the mic or other systems.

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There’s one caveat: The hackers have to convince a user to download or run an app that’s not in the App Store or allowed by Apple. That means malware can skip all the checks done by Apple’s security mechanisms like Gatekeeper and File Quarantine, which are designed to stop any unapproved, dangerous apps from running. Malicious hackers can and have created malware that, though unsigned, is misclassified by Apple’s operating system, thanks to a logic error in macOS’ code. The hacks effectively take Mac security back a decade, according to Patrick Wardle, a former NSA analyst and a macOS security expert, who described it as one of the worst security issues to have ever hit the Apple operating system. Malware that takes advantage of the bug has been hitting Macs since at least January, making patching all the more urgent.

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Indeed, a Washington Post article published two weeks ago revealed how the company sits on a “massive backlog” of vulnerability reports, leaving them unresolved for months, hands out lower monetary payouts to bug hunters, and, in some cases, outright bans researchers from its Developer Program for filing reports.Apple Mac users are being urged to update their macOS software now, as they’re at “grave risk” of hackers exploiting what’s been described as one of the worst vulnerabilities to affect the tech giant’s computers in years. Researcher Denis Tokarev (aka illusionofchaos), who disclosed the latter three issues, said they were reported to Apple between March 10 and May 4, claiming what was “a frustrating experience participating in Apple Security Bounty program” for its failure to fix the issues despite having them responsibly disclosed “up to half a year” ago.

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The development also comes as security researchers have disclosed unpatched zero-day flaws in iOS, including a lock screen bypass bug and a clutch of vulnerabilities that could be abused by an app to gain access to users’ Apple ID email addresses and full names, check if a specific app is installed on the device given its bundle ID, and even retrieve Wi-Fi information without proper authorization.

The patches are available for devices running macOS Catalina and iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Air, iPad mini 2, iPad mini 3, and iPod touch (6th generation) running iOS 12.5.4. The exploit is also significant for its ability to get around defenses built by Apple in iOS 14 - called BlastDoor - to prevent such intrusions by filtering untrusted data sent over the texting application.

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It relied on iMessage as an entry point to send malicious code that stealthily installed the Pegasus spyware on the devices and exfiltrate sensitive data without tipping the victims off. The scale and scope of the operation remains unclear as yet. The zero-click remote attack weaponizing CVE-2021-30860 is said to have been carried out by a customer of the controversial Israeli company NSO Group since at least February 2021.

Two other flaws include CVE-2021-30858 and CVE-2021-30860, both of which were resolved by the company earlier this month following disclosure from the University of Toronto’s Citizen Lab about a previously unknown exploit called “FORCEDENTRY” (aka Megalodon) that could infect Apple devices without so much as a click. Google’s Threat Analysis Group, which is credited with reporting the flaw, said it detected the vulnerability being “used in conjunction with a N-day remote code execution targeting WebKit.” The Cupertino-based tech giant said it addressed the bug with improved state handling. Apple on Thursday released security updates to fix multiple security vulnerabilities in older versions of iOS and macOS that it says have been detected in exploits in the wild, in addition to expanding patches for a previously plugged security weakness abused by NSO Group’s Pegasus surveillance tool to target iPhone users.Ĭhief among them is CVE-2021-30869, a type confusion flaw that resides in the kernel component XNU developed by Apple that could cause a malicious application to execute arbitrary code with the highest privileges.