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If you call the number, the tech support scammer will walk you through the steps of enabling screen sharing (sometimes through macOS itself, other times through a 3rd party remote control program such as VNC or PCAnywhere), and proceed to take control of your computer to “fix” the problem (which didn’t exist in the first place). We’ve discussed these scams on this show in the past, but here’s a quick refresher on them: You’re surfing the web when suddenly you see an alert pop up saying your Mac is infected and you need to call some 1-800 number to fix it. There are a number of tech support scams that take advantage of the screen sharing functionality in macOS.
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Since a remote user can control your mouse and enter text on your Mac when screen sharing is enabled, it’s extremely important to only enable screen sharing for people you specifically know and trust - you’re putting the security of your computer in their hands! A malicious remote user could do all sorts of bad stuff, such as disabling your Mac’s digital defenses or sending themselves your sensitive files. While screen sharing can be great when a family member or friend is helping you fix a problem with your computer, it does come with a certain degree of risk when it comes to the security of your Mac. You can restrict this option to only provide screen sharing access to specific users, or allow anyone to request permission to share your screen. When you set up screen sharing, you’ll have the opportunity to designate who can share the Mac’s screen. If you want to allow someone else to help you solve a problem with your Mac, this is a quick and easy way to give your friend access. With that said, it’s a very useful tool in certain situations. A screen-shared user can even reboot the machine - so this isn’t a feature you want to use with anyone you don’t explicitly trust. The user you’ve shared the screen with can move the mouse cursor, open or close windows, enter text from their keyboard, and even start apps.
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Screen Sharing: Put simply, screen sharing does exactly what it says - it allows you to let another Mac user view your screen as if it were their own, from anywhere in the world.
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Additionally, we’ll be reviewing the various sharing options in the context of a trusted home or office network environment – if you’ll be traveling with your Mac or connecting to an untrusted network such as the free wifi network at your local coffee shop, you’ll want to disable all of the sharing services unless you need them enabled for a specific reason on the untrusted network. To get there, click the Apple icon in the upper lefthand corner of your screen, click System Preferences, and then click the “Sharing” icon. Note: All of the settings we’ll be discussing in this episode can be found on the Sharing preferences screen. Whether you just want to share information over your home network or you want to make sure your computer is set up for sharing in a secure manner, understanding the sharing preferences will make your macOS experience all the more valuable! In today’s episode of The Checklist, we’ll cover each of the options on this preferences screen, what you can do with them, and the potential impact they can have on your Mac’s security. It’s important to only enable the sharing services that you actually need, and leave the rest of them turned off. Utilizing some of the sharing options can have an impact on the security of your computer, as well. Some of them, like file and printer sharing, are as straightforward as they sound others, like “Remote Apple Events,” can leave you scratching your head. Did you know that your Mac has a powerful suite of sharing tools built right into macOS? If you’ve ever looked through your system preferences, maybe you’ve noticed the Sharing screen and all its various options. That was a founding idea behind the Internet, and the need to exchange information continues to drive innovation today. Checklist 34: Sharing Preferences in macOSĬomputers offer users the most usefulness when they connect and share data with one another.
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