If you are running a device with Android 4.3 or earlier you should avoid third-party app stores; arguably all users should but there are times when Google Play does not offer what you need.  A security problem with the way that APK files are authenticated during install can allow a seemingly harmless app to be modified, either at the source or while being transmitted, leading to the installation of an app that may not be entirely honest about what it does.  Palo Alto Network's testing shows versions 4.4+ do not suffer from this particular problem nor do the vetted apps at the Google Play store.  It is unlikely you will encounter this problem unless you usually install things from places like Creepy Ice Cream Van Discount Apps and Malware,  but you should be aware of the existence of this issue.  More at The Inquirer.

"A FRESH VULNERABILITY CALLED Android Installer Hijacking is making itself known as a threat to almost half of all Android users."

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