Apple's latest OS for the iPhone, iOS 9, will start rolling out to devices later on today (if it hasn't started already), and it could be described as "none too soon." Besides the usual new features and performance improvements, iOS 9 will also fix a huge security vulnerability which allows malware apps to be installed on an iPhone.
This vulnerability will even let a third-party gain control of a user’s iPhone. Scary stuff! Here's a quote with more of the details,
Luckily the crafty Apple engineers have fixed it with this release and the vulnerability is about to disappear. In the mean-time, to bypass the vulnerability, simply turn off AirDrop when you aren't using it. In the thread below we included a video demonstration of the vulnerability.