AuraSpell#closePositionFarm exits pool with single token and without any slippage protection
AuraSpell.sol#L221-L236\\n```\\n            (\\n                uint256[] memory minAmountsOut,\\n                address[] memory tokens,\\n                uint256 borrowTokenIndex\\n            ) = _getExitPoolParams(param.borrowToken, lpToken);\\n\\n            wAuraPools.getVault(lpToken).exitPool(\\n                IBalancerPool(lpToken).getPoolId(),\\n                address(this),\\n                address(this),\\n                IBalancerVault.ExitPoolRequest(\\n                    tokens,\\n                    minAmountsOut,\\n                    abi.encode(0, amountPosRemove, borrowTokenIndex),\\n                    false\\n                )\\n```\\n\\nWhen exiting a the balancer vault, closePositionFarm makes a subcall to _getExitPoolParams which is used to set minAmountsOut.\\nAuraSpell.sol#L358-L361\\n```\\n    (address[] memory tokens, , ) = wAuraPools.getPoolTokens(lpToken);\\n\\n    uint256 length = tokens.length;\\n    uint256[] memory minAmountsOut = new uint256[](length);\\n```\\n\\nInside _getExitPoolParams we see that minAmountsOut are always an empty array. This means that the user has no slippage protection and can be sandwich attacked, suffering massive losses.
Allow user to specify min amount received from exit
Exits can be sandwich attacked causing massive loss to the user
```\\n            (\\n                uint256[] memory minAmountsOut,\\n                address[] memory tokens,\\n                uint256 borrowTokenIndex\\n            ) = _getExitPoolParams(param.borrowToken, lpToken);\\n\\n            wAuraPools.getVault(lpToken).exitPool(\\n                IBalancerPool(lpToken).getPoolId(),\\n                address(this),\\n                address(this),\\n                IBalancerVault.ExitPoolRequest(\\n                    tokens,\\n                    minAmountsOut,\\n                    abi.encode(0, amountPosRemove, borrowTokenIndex),\\n                    false\\n                )\\n```\\n