SlowMist (@SlowMist_Team) “🚨SlowMist TI Alert🚨 💸 @EnsoBuild Loss: ~5.6 ETH 🔍 Root Cause: An oracle pric” — TopicDigg

🚨SlowMist TI Alert🚨 💸 @EnsoBuild Loss: ~5.6 ETH 🔍 Root Cause: An oracle price calculation error occurred in the Enso Finance / DPI Strategy Vault. In `Controller.deposit()`, the EnsoOracle's `estimateStrategy()` is called before and after the user tokens are transferred, and shares are minted on the difference: `mint = amountAdded * totalSupply / valueBefore`. The valuation chain — EnsoOracle → ItemEstimator → `ProtocolOracle.consult()` — prices tokens via UniV3 `pool.observe()`, but the registry's `fee` field is reused as `secondsAgo`, producing a near-spot TWAP window. Due to the absence of TWAP consistency checks or price range validation—combined with the fact that the liquidity in the Uniswap v3 pool used for price calculation was inherently imbalanced—an attacker was able to swap 0.683 WETH for 268.42 FARM tokens on Uniswap v2 in a single transaction, while the imbalanced v3 pool incorrectly valued that amount at 6.3 WETH (~ 9.2x). Subsequently, an excessive number of shares were minted at an incorrect price and redeemed for profit. 📌 Attacker: `0x3196398321D77a2511d369DCB6eCa9d2aD87b73A` 📌 Victim (Strategy): `0x890ed1ee6d435a35d11051d9ed97ff457ce53b5942` 📌 Vulnerable contract: Controller impl: `0xd8D22509C1fe47516D8F82A28CFd728111F57Ef1` Oracle: `0xAb7505eB360cE0D63e8E88f7853677EcD5537DC0` Powered by Tx: