ID:
lendf-me-529
100 pts
Platform:
Type:
Category:
Method:
Data Sources:
Ethereum
Protocol
Dexes
Contract Vulnerabilities
Extended Method:
Reentrancy attack
Days in Operation:
0
100 pts each
A known reentrancy vulnerability was exploited on Uniswap against the imBTC. liquidity pool. Around 24 hours later, at Apr-19–2020 12:58:43 AM +UTC, a similar hack occurred on Lendf.Me.” reads the analysis published by Blockchain security firm PeckShield. “Technically, the main logic behind these two incidents is the fact that the implementation of ERC777-compatible transferFrom() has a callback mechanism, which allows the attacker to utterly hijack the transaction and perform additional illicit operations (via _callTokensToSend()) before the balance is really updated (i.e., inside _move()). In the case of the Lendf.Me hack, the attacker exploited the same issue to increase the internal record of the attacker’s imBTC collateral amount so that she can borrow (and indeed borrow) a variety of 10+ assets from all available Lendf.Me liquidity pools (with total asset value of $25,236,849.44).
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