, the attacker exploited a reentrancy vulnerability in both protocols. Reentrancy is a Solidity programming language vulnerability that allows an attacker to trick a protocol’s contract into making an external call to an untrusted contract. Once this happens, the hacker can then use this untrusted contract to make repeated calls to the protocol to drain its funds.
In the case of Agave and Hundred Finance, the attacker introduced a reentrancy bug on both protocols paving the way for a flash loan exploit. The reentrancy vulnerability appears centered on the “callAfterTransfer” function, allowing the hackers to continue borrowing from the protocols — siphoning off massive swathes of liquidity.
In essence, the attacker was making recursive calls to siphon off user funds without having to put up additional collateral. Then the attacker terminated the exploit with a “liquidationCall,” paying back their initial flash loan while still holding significant liquidity from both projects.
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