iPhone and iPad users regularly ignore update messages, whether for iOS or apps. It is not often that security researchers declare an iOS vulnerability to be serious and this is one situation where you should update your iOS devices as soon as possible. Once executed, the exploit could leak authentication credentials stored in memory to the attacker, including Wi-Fi passwords and any credentials the target is using in the browser, such as website and email logins.
The update is simple and takes no more than 5-10 minutes, depending on the speed of your network connection. Here is my suggestion:
1) Connect to a Wifi network. This will save your precious mobile data.
2) Plug your iOS device into a charger, especially if it has less than 50% battery charge left.
3) Prepare a nice cup of artisan coffee.
4) Start the update from the Settings->General->Software update menu (look for iOS 9.3.3).
5) Kick back and wait for Apple to do its magic.
Remember to take update requests seriously. In this case, details on all 43 flaws addressed in 9.3.3 can be found on Apple’s advisory .
Just a year ago vulnerabilities in Android allowed hackers to quietly spy on nearly a billion phones with one specially-crafted text. iPhone owners should now take note: a security researcher today warned there are comparable vulnerabilities to those Stagefright bugs in iOS allowing completely silent, almost undetectable password theft from iPhones. Apple has patched the flaws in iOS 9.3.3, however, and users have been advised to update as soon as they can.