Submitted by GalloDaSballo, also found by ladboy233, carrotsmuggler, kaden, cergyk, and rvierdiiev
The strategy is pricing stETH as ETH by asking the pool for its return value
This is easily manipulatable by performing a swap big enough
https://github.com/Tapioca-DAO/tapioca-yieldbox-strategies-audit/blob/05ba7108a83c66dada98bc5bc75cf18004f2a49b/contracts/lido/LidoEthStrategy.sol#L118-L125
Logs
Considering that swap fees are 1BPS, the attack is profitable at very low TVL
Use the Chainlink stETH / ETH Price Feed or Ideally do not expose the strategy to any conversion, simply deposit and withdraw stETH directly to avoid any risk or attack in conversions
https://data.chain.link/arbitrum/mainnet/crypto-eth/steth-eth
https://data.chain.link/ethereum/mainnet/crypto-eth/steth-eth
0xRektora (Tapioca) confirmed via duplicate issue 828
