SSD Advisory – macOS Finder RCE - SSD Secure Disclosure

SSD Advisory – macOS Finder RCE - SSD Secure Disclosure


Find out how a vulnerability in macOS Finder system allows remote attackers to trick users into running arbitrary commands.

Vulnerability Summary

A vulnerability in macOS Finder allows files whose extension is inetloc to execute arbitrary commands, these files can be embedded inside emails which if the user clicks on them will execute the commands embedded inside them without providing a prompt or warning to the user.


An independent security researcher, Park Minchan, has reported this vulnerability to the SSD Secure Disclosure program.

Affected Versions

  • macOS Big Sur and prior

  • Vendor Response

    The vendor has been notified us that file:// has been silently patched the vulnerability in Big Sur and has not assigned it a CVE. We have notified Apple that FiLe:// (just mangling the value) doesn’t appear to be blocked, but have not received any response from them since the report has been made. As far as we know, at the moment, the vulnerability has not been patched.

    Vulnerability Analysis

    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.

    The case here inetloc is referring to a file:// “protocol” which allows running locally (on the user’s computer ..

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