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There are two snags to this otherwise protective system: first, the file containing these overrides is protected, in Catalina being on the System volume, so the user is effectively prevented from changing it. Unlike app preferences, which can be managed by the user at the command line, there’s no way for the user to add their own overrides.
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If you download items using an app which doesn’t itself require the quarantine flag to be set, and Apple doesn’t provide an override for it to do so, there doesn’t appear to be any good way to add that yourself. It’s also unclear whether this system works with command tools, which are single file executables. They can have their ist embedded in the executable, but this is rare unless they need to be notarized. For many users, it might be helpful, for example, if the standard tool curl were to set quarantine flags, as it’s often used to bypass quarantine and thus presents a significant vulnerability.įinally, for some users at least, an app setting the quarantine flag isn’t of much use, as that user routinely strips the flag from downloads.
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