Caput has been warning retailers and restaurants about his scheme since he first discovered it nearly two years ago. But other restaurants, retail outlets, and companies, which Caput declined to name on the record, have either failed to implement security measures against his fraud trick or added a defense that he was able to circumvent. That allowed him to carry out the same bruteforce attacks, find the numbers of activated cards, and exploit them just as he had in Some retailers' cards use PIN numbers in addition to the number encoded into the card.
But that PIN is only required to check the card's balance, not to spend its value, Caput says. And if a hacker really wanted to determine the value of one of those PIN-protected cards, they could bruteforce it with Burp Intruder just as easily as the card's number itself.
If gift cards are left accessible, he can simply grab the entire stack of cards, photograph the back of them, and later place them back in the tray. Then he simply checks on those numbers periodically via the restaurant or retailer's website until the card's been activated.
When it is, he can spend whatever money has been added to it. The vulnerabilities that Caput found aren't merely theoretical. Bertie Stock. Reply to author.
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