OneKey reproduces transaction replacement attack on outdated Ledger Ethereum app

OneKey said it reproduced an exploit against an older version of the Ledger app in its lab environment, which Ledger fixed in its Ethereum app 1.22.2, with no user funds lost.

The in-house security team at open-source wallet provider OneKey said it successfully reproduced an exploit targeting an outdated version of Ledger’s on-device Ethereum application in a test environment.

OneKey founder and CEO Yishi Wang said they executed a “transaction replacement attack” against Ledger Ethereum app 1.22.1 by exploiting a previously patched vulnerability that lets attackers overwrite the transaction waiting to be signed while the user is still reviewing the legitimate transaction.

Ledger said exploiting the vulnerability required control over communications between the device and its host, such as through malware, compromised wallet software or a hostile webpage. Ledger added app-level safeguards with Ethereum app 1.22.2 released on Aug. 13, before fixing the underlying issue in Secure SDK 26.6.1 on Aug. 21.

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