Source: Marius van der Wijden“First we thought that someone from the trusted validators has made a mistake, but we quickly realized that this transaction originated from a new account recently funded by the faucet.” The ERC-20 standard does not forbid a zero token transfer; this allows anyone, even if they don’t own any tokens, to transfer to another address, which the unknown user realized, van der Wijden said.“The only way to stop the attack would be to filter out all transactions that interact with the deposit contract.
A fix was rolled out, but van der Wijden says they missed one edge case, and an unknown user exploited it by sending a 0-token transfer to the deposit address, which triggered the error again. “After a few minutes we saw a lot of empty blocks again, so we looked again into the transaction pools and found another offending transaction that triggered the same edge cases,” he said.
So we made the following private fix, which we deployed to a few of the DevOps nodes.”“We suspected that the attacker was reading some of our chats, so we decided not to publicize the fix, but only update a few nodes that we controlled in order to get more full blocks on the network,” he added. Source: Marius van der WijdenBy 2 pm, all the nodes had been updated with the fix, and the unknown user transaction was mined successfully.
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Author / Journalist: Cointelegraph by Stephen Katte
The story "Unknown attacker causes headaches during Pectra upgrade on Sepolia" has 508 words across 16 sentences, which will take approximately 3 - 5 minutes for the average person to read.
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