It comes a few years after Master Lock engineers developed new padlocks that resisted a popular form of attacks using shims made from soft drink cans. It's by no means the only way to break the security of a popular padlock. By combining the insights from all three weaknesses he devised the attack laid out in the video. (He likened the Master Lock design to a side channel in cryptographic devices that can be exploited to obtain the secret key.) Kamkar then made a third observation that was instrumental to his Master Lock exploit: the first and third digit of the combination, when divided by four, always return the same remainder. He then physically broke open a combination lock and noticed the resistance he observed was caused by two lock parts that touched in a way that revealed important clues about the combination. Kamkar told Ars his Master Lock exploit started with a well-known vulnerability that allows Master Lock combinations to be cracked in 100 or fewer tries. In 2005, he unleashed the Samy worm, a cross-site scripting exploit that knocked MySpace out of commission when it added more than one million MySpace friends to Kamkar's account. The technique was devised by Samy Kamkar, a serial hacker who has created everything from stealthy keystroke-pilfering USB chargers to DIY stalker apps that mined Google Streetview. The two locked positions and the one resistance position are then recorded on a Web page that streamlines the exploit.īreak open any Master Combo Lock in 8 tries or less! (An attacker can still turn through it but will physically feel the resistance.) This location represents the resistance location. At some point before a full revolution is completed, the dial will resist being turned. Next, an attacker again lifts the locked shackle, this time with less force, while turning the dial clockwise. The remaining two locations represent locked positions. One of them will be ignored as it is exactly between two whole numbers on the dial. Before the dial reaches 11, there will be three points where the dial will resist being turned anymore. The exploit involves lifting up a locked shackle with one hand while turning the combination dial counterclockwise starting at the number 0 with the other. There's a vulnerability in Master Lock branded padlocks that allows anyone to learn the combination in eight or fewer tries, a process that requires less than two minutes and a minimal amount of skill to carry out.
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