A new vulnerability has been discovered on computers that run Windows Vista, Windows 7 and Windows 8.x. While it won’t allow an attacker to hijack your computer to mine cryptocurrency or encrypt your files and hold them for ransom, it could cause you some serious headaches.
Exploiting the bug is actually incredibly simple, too. All it takes is a few characters ($MFT) inserted into the code of a web page. When a vulnerable Windows system accesses the page, performance will start to gradually degrade until it’s unusable — or in some cases throws up the dreaded blue screen of death.
How is it that a dollar sign and three letters can bring a computer to a screeching halt? It has to do with the master file table, perhaps the most important file on many Windows systems’ hard drives. It contains information about all the files you see in Windows Explorer — what folders they’re saved in, where they reside physically on the hard drive, access permissions, and timestamps (including when files are created, edited, and accessed).