According to a security researcher via ArsTechnica, your MacBooks might be vulnerable to man-in-the-middle attacks thanks to a flaw found in the older version of a software update called Sparkle ( Sparkle is a popular third-party framework that allows developers to push out updates) used by most third-party apps.
The flaw gives an attacker the access to install malicious codes on your MacBooks and it doesn’t matter if you are using the latest version of the Mac OS.
Do bear in mind that apps downloaded officially (i.e. from the App Store) are not affected. However, we know that for power users, downloading third party apps is almost a necessity. The apps confirmed by Ars Technica include Camtasia 2 v2.10.4, uTorrent v1.8.7, Sketch v3.5.1 and DuetDisplay v18.104.22.168, VLC, Adium and many others. You can also identify these apps using the method below:
To protect yourself, Update to the latest Sparkle version (Click here), you should also avoid using unsecured Wi-Fi networks.
I guess the really long vacation from the world of viruses/malware is finally over!