Decentralized finance (DeFi) lending protocol Euler Finance grew to become a sufferer of a flash mortgage assault on March 13, ensuing within the greatest hack of crypto in 2023 up to now. The lending protocol misplaced practically $197 million within the assault and impacted greater than 11 different DeFi protocols as properly.
On March 14, Euler got here out with an replace on the state of affairs and notified its customers that they’d disabled the weak etoken module to dam deposits and the weak donation operate.
The agency mentioned that they work with numerous safety teams to carry out audits of its protocol, and the weak code was reviewed and permitted throughout an outdoor audit. The vulnerability was not found as a part of the audit.
Considered one of our auditing companions, @Omniscia_sec, ready a technical autopsy and analysed the assault in nice element. You possibly can learn their report right here:https://t.co/u4Z2xdutwe
Briefly, the attacker exploited weak code which allowed it to create an unbacked token debt… https://t.co/FGnPqvYUGB
— Euler Labs (@eulerfinance) March 14, 2023
The vulnerability remained on-chain for eight months till it was exploited, regardless of a $1 million bug bounty in place.
Sherlock, an audit group that has labored with Euler Finance prior to now, verified the basis explanation for the exploit and helped Euler submit a declare. The audit protocol later voted on the declare for $4.5 million, which handed, and later executed a $3.3 million payout on March 14.
In its evaluation report, the audit group famous a big issue for the exploit: a lacking well being test in “donateToReserves,” a brand new operate added in EIP-14. Nonetheless, the protocol careworn that the assault was nonetheless technically potential even earlier than EIP-14.
Associated: Greater than 280 blockchains liable to ‘zero-day’ exploits, warns safety agency
Sherlock famous that the Euler audit by WatchPug in July 2022 missed the crucial vulnerability that ultimately led to the exploit in March 2023.
Equally, Sherlock stands behind each auditor who reviewed Euler.
Sherlock initially labored with @cmichelio to audit the primary model of Euler in Dec 2021, then with @shw9453 to audit a really small replace in Jan 2022, and at last with @WatchPug_ to audit EIP-14 in July 2022.
— SHERLOCK (@sherlockdefi) March 13, 2023
Euler has additionally reached out to main on-chain analytic and blockchain safety corporations, equivalent to TRM Labs, Chainalysis and the broader ETH safety group, in a bid to assist them with the investigation and get better the funds.
Euler notified that also they are making an attempt to contact these accountable for the assault so as to study extra concerning the challenge and probably negotiate a bounty to get better the stolen funds.