If you are a Linux user then your system might not be as secure as you think it is. A recent revelation by a security agency has proved that any Linux system can be compromised if the user presses Backspace 28 times in succession. This revelation has brought panic amongst most Linux users and for Red Hat and Ubuntu developers as well.
Hackers are rather smart at what they do. Not only do they have in depth knowledge of software systems but they also have a great understanding of things work from software standpoint. However just knowledge an understanding is not enough; what actually brings success to them is constant hard work and the persistent effort they keep making at a task till it is actually resolved. Granted, they use their talent for objectives that are not very honest; but a lot of hackers have now started using their talent for ethical purposes as well and work for top notch positions in the cyber divisions of various Government agencies.
A few of these ethical hackers who work as security researchers at he polytechnic university of Valencia, Spain were able to figure out that Linux systems can be breached if Backspace is pressed 28 times continuously. This action skips the lock screen entirely and starts up the grub rescue shell. Once the access is gained, the person using the device can carry out any activities they can think of.
The reason why this happens was also explained by the security researchers in a report. They are of the view that by pressing backspace 28 times a small error in the memory is generated which causes the grub rescue shell to be initiated. They have assured the users that this activity would have to be done on individual machines and can not launch an infection over the internet in general.
In response to this problem Red Hat, Ubuntu and Debian have come up with security patches to combat any such problems. The problem is unique to any Linux system that makes use of Grub 2 bootloader.