Older Apple computers may be susceptible to a new zero-day vulnerability discovered by a security researcher, who found the flaw can be used to install rootkit malware that’s nearly undetectable and very hard to remove.

This post is brought to you by Bitdefender.

Macs are not immune to cyberattack and viruses. Though the threats are real, leading antivirus maker Bitdefender doesn’t use scare tactics to warn people about malware targeting Macs.

Instead, Bitdefender is running its Hug a Mac campaign this month. You could win a MacBook Air in this fun competition simply by uploading a selfie of you and your Mac, then tagging it #hugamac to enter the draw. Full details can be found on Bitdefender’s Hug a Mac campaign webpage.

We all—or should—password protect our Macs. Start up, login. Come out of sleep, login. Deactivate the screensaver, login (though technically that’s just unlocking). What about “fire up Chrome” or “start up Evernote”? We don’t usually think about entering a password to do those tasks. Maybe we should.

Mac App Blocker is, frankly, a new one on my. It’s an app that lets you set application passwords. Launch Mail, enter a password. Chrome…Evernote…Word… you get the idea. Interesting, huh?