![]() ![]() Variations on the exploit might also allow so-called "evil maid attacks," in which people with brief access to the device could compromise it while they clean a user's hotel room. The same undetectable backdoor works on the $200 Ledger Blue, which is billed as a higher-end device. Using the same approach, attackers could perform a variety of other nefarious actions, including changing wallet destinations and amounts for payments so that, for instance, an intended $25 payment to an Ars Technica wallet would be changed to a $2,500 payment to a wallet belonging to the backdoor developer. The attacker could then enter those passwords into a new Ledger hardware wallet to recover the private keys the old backdoored device stores for those addresses. The stealth backdoor Rashid developed is a minuscule 300-bytes long and causes the device to generate pre-determined wallet addresses and recovery passwords known to the attacker. Moxier wallet replacement code#In a post published to his personal blog, Saleem Rashid demonstrated proof-of-concept code that had allowed him to backdoor the Ledger Nano S, a $100 hardware wallet that company marketers have said has sold by the millions. On Tuesday, a 15-year-old from the UK proved these claims wrong. Earlier this year, Ledger's CTO said attestation was so foolproof that it was safe to buy his company's devices on eBay. "There is absolutely no way that an attacker could replace the firmware and make it pass attestation without knowing the Ledger private key," officials said in 2015. The reason: "cryptographic attestation" that uses unforgeable digital signatures to ensure that only authorized code runs on the hardware wallet. ![]() For years, executives at France-based Ledger have boasted their specialized hardware for storing cryptocurrencies is so securely designed that resellers or others in the supply chain can't tamper with the devices without it being painfully obvious to end users. ![]()
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