macOS 11.3 Patches Security Vulnerability That Bypassed Built-In Malware Protections
Apple today confirmed to TechCrunch that the just-released macOS 11.3 software update patches a security vulnerability that reportedly could have allowed a hacker to remotely access a user's sensitive data by tricking a user into opening a spoofed document.
"All the user would need to do is double click — and no macOS prompts or warnings are generated," said security researcher Cedric Owens, who discovered the vulnerability in mid-March, according to the report. Owens developed a proof-of-concept app masquerading as a harmless document that exploits the bug to launch the Calculator app, but he said the vulnerability could be exploited for more nefarious purposes.
According to security researcher Patrick Wardle, the vulnerability was the result of a logic bug in macOS's underlying code.
"In simple terms, macOS apps aren't a single file but a bundle of different files that the app needs to work, including a property list file that tells the application where the files it depends on are located," explains TechCrunch. "But Owens found that taking out this property file and building the bundle with a particular structure could trick macOS into opening the bundle — and running the code inside — without triggering any warnings."
In addition to fixing the bug in macOS 11.3, Apple told TechCrunch it patched earlier macOS versions to prevent abuse, and updated macOS's built-in anti-malware system XProtect to block malware from exploiting the vulnerability. The report says the bug was exploited for months, but it's unclear how many users were impacted.
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