This attack is highly possible and works against for all the worlds top computer brands including Dell, Lenovo, and even Apple.
Cold Boot Attacks is not a new method, it was discovered back in 2018 by the security researcher that allow stealing information from the RAM even after the computer lost its power.
But data will persist for minutes or even hours if the chips are kept at low temperatures and the data recovery is possible if the attacker physically accesses the system and these Cold Boot Attacks exploit DRAM remanence effects to recover cryptographic keys held in memory.
Here we come to the new form of Cold Boot Attacks that discovered by two researchers Olle and Pasi’s who find the way to disable this overwrite feature by physically manipulating the computer’s hardware.
Steal the Encryption Keys
Experts achieve this using simple tools and rewrite the non-volatile memory chip that contains these settings, disable memory overwriting, and enable booting from external devices.
Cold boot attacks primary functionality is to obtain the encryption key from the user devices by booting from an external device (USB stick) to pulled to data from the RAM memory.
It also leads to an attacker can perform other actions such as steal the passwords, and other sensitive information.
An attacker only achieves this action during the target system in sleep mode when the system RAM is still active.
There is some relevant tool required to perform this attack and it can be effective against nearly all modern laptops, it means hackers have a consistent, reliable way to compromise their targets.
According to Olle via F-secure, “It’s not exactly easy to do, but it’s not a hard enough issue to find and exploit for us to ignore the probability that some attackers have already figured this out,” says Olle. “It’s not exactly the kind of thing that attackers looking for easy targets will use. But it is the kind of thing that attackers looking for bigger phish, like a bank or large enterprise, will know how to use.”
Cold Boot Attacks Defence & Mitigation
Since there is various physical action involved, its attack is not that simple to perform by an attacker and it’s up to device manufacturers to strengthen the security of desktops and laptops to help protect them from attacks like these.
Hibernation + pre-boot authentication is the best protection against cold boot attacks. No keys in memory to steal!
Also, companies should be prepared for the strong physical security policies and train the employee to keep it them physically safe.
Olle and Pasi recommend that IT departments configure all company computers to either shut down or hibernate (not enter sleep mode) and require users to enter their BitLocker PIN whenever they power up or restore their computers.