Researcher Park Minchan reported a bug within macOS Finder that lets certain files execute commands. It affects all versions of macOS up to Big Sur.

A vulnerability in the way macOS processes inetloc files causes it to run commands embedded inside, the commands it runs can be local to the macOS allowing the execution of arbitrary commands by the user without any warning / prompts.

Originally, inetloc files are shortcuts to an Internet location, such as an RSS feed or a telnet location; and contain the server address and possibly a username and password for SSH and telnet connections; can be created by typing a URL in a text editor and dragging the text to the Desktop.

Check It Out: macOS Finder Bug Lets Certain Files Run Arbitrary Commands

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