An Ethereum developer says the current Pectra improve of the Sepolia testnet bumped into errors, which was made worse after an attacker used an “edge case” to trigger the mining of empty blocks.
Pectra rolled out on its remaining testnet, Sepolia, at 7:29 am on March 5, however Ethereum developer Marius van der Wijden mentioned in a March 8 publish that the group instantly began seeing error messages on their geth node and empty blocks being mined.
The error was as a result of the deposit contract triggered the unsuitable sort of occasion — a switch occasion as an alternative of a deposit, in keeping with Van der Wijden.
A repair was rolled out, however van der Wijden says they missed one edge case, and an unknown consumer exploited it by sending a 0-token switch to the deposit tackle, which triggered the error once more.
“After a couple of minutes we noticed numerous empty blocks once more, so we regarded once more into the transaction swimming pools and located one other offending transaction that triggered the identical edge instances,” he mentioned.
Supply: Marius van der Wijden
“First we thought that somebody from the trusted validators has made a mistake, however we shortly realized that this transaction originated from a brand new account just lately funded by the tap.”
The ERC-20 commonplace doesn’t forbid a zero token switch; this permits anybody, even when they don’t personal any tokens, to switch to a different tackle, which the unknown consumer realized, van der Wijden mentioned.
“The one option to cease the assault could be to filter out all transactions that work together with the deposit contract. So we made the next personal repair, which we deployed to a couple of the DevOps nodes.”
“We suspected that the attacker was studying a few of our chats, so we determined to not publicize the repair, however solely replace a couple of nodes that we managed with the intention to get extra full blocks on the community,” he added.
Supply: Marius van der Wijden
By 2 pm, all of the nodes had been up to date with the repair, and the unknown consumer transaction was mined efficiently.
Van der Wijden mentioned they by no means misplaced finalization throughout the incident, and the problem was remoted to Sepolia as a result of they had been utilizing a token-gated deposit contract as an alternative of the traditional mainnet deposit contract.
Beforehand, the builders examined the Pectra improve on the Holesky testnet on Feb. 26, which additionally encountered points.
Consequently, the builders have determined to postpone the Pectra improve till extra checks may be carried out.
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