It seems that Apple's "impenetrable fortress", that is, its iOS systems, is not so impenetrable after all, as researchers recently discovered a bug in the iOS systems that makes iPhones and iPads vulnerable to cyber attacks and hacking.

On Monday, November 10, cyber security firm FireEye Inc published details about the vulnerability on its blog, explaining that the bug enables hackers to access devices by persuading users to install malicious applications (like apps that may look like your bank or email program which can replace genuine Apple apps) with tainted text messaged, emails, and Web links.

Once the user installs these apps, the hacker can then steal personal data from the user's phone and send it back to the hacker without the user's knowledge. This is what FireEye calls a "Masque Attack".

According to FireEye, the bug affects all Apple mobile devices running with iOS 7 or later, whether it is jailbroken (a user-initiated state that allows you to install any app from off the Internet), or not.

This accounts for approximately 95% of all Apple mobile devices that are currently in use, which makes them all vulnerable. Security firm Palo Alto Networks has also weighed in on the growing concerns about Apple's vulnerability.

According to CNET, Palo Alto described a new attack they discovered, allowing unapproved apps downloaded from the Internet could infect iPhones when plugged into Mac computers. The attack, dubbed "WireLurker," was first discovered in China and is based on the same bug. On that note, Apple Inc has yet to comment on the matter.

In an effort to control and eradicate this potential threat, FireEye has recommended that all Apple users download and install apps from trusted sites and if any pop-up notification asks you to install an app, simply decline and you'll be safe.