A postmortem of Euler Finance’s flash loan exploit has revealed that the vulnerability at the root of the exploit remained on-chain for 8 months. 
As a result of the vulnerability, Euler Finance lost $200 million earlier this week. 
An Eight-Month-Old Vulnerability 
Euler Finance’s auditing partner, Omniscia, has released a detailed postmortem report analyzing the vulnerability that hackers exploited earlier in the week. According to the postmortem report, the vulnerability occurred from the decentralized finance protocol’s incorrect donation mechanism, which permitted for donations to be performed without a proper health check. The code was introduced in eIP-14, a protocol that introduced an array of changes in the Euler Finance ecosystem. 
Euler Finance allows users to create artificial leverage by minting and depositing assets in the same transaction. This mechanism enabled users to mint more tokens than the collateral held by Euler Finance itself. The new mechanism allowe

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