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Concrete
The DeFi Liquidity Metalayer - powering the creation and trading of on-chain derivatives.
View Repo- Start date15 Nov 8:00 PM UTC
- End date29 Nov 8:00 PM UTC
- Total awards$112,500 in USDC
- Duration14 days
- Details
Concrete audit details
- Total Prize Pool: $112,500 in USDC
- HM awards: $72,480 in USDC
- QA awards: $3,020 in USDC
- Judge awards: $8,500 in USDC
- Validator awards: $5,500 USDC
- Scout awards: $500 in USDC
- Update audit: $22,500 in USDC*
- Read our guidelines for more details
- Starts November 15, 2024 20:00 UTC
- Ends November 29, 2024 20:00 UTC
ℹ️ This audit will be followed by an update audit focused on fixes from this scope with a total prize pool of $22,500 in USDC.
Automated Findings / Publicly Known Issues
The 4naly3er report can be found here.
Slither's output can be found here.
Note for C4 wardens: Anything included in this Automated Findings / Publicly Known Issues section is considered a publicly known issue and is ineligible for awards.
Overview
Concrete is a blockchain protocol that allows DeFi users to optimize on capital efficiency by protecting leveraged positions against collateral depreciation and by offering attractive yield opportunities for liquidity providers.
Links
- Previous audits: Earn V1_SSC.pdf
- Documentation: https://blueprint-finance.gitbook.io/concrete_protocol/pSPVTC2wbOO8D1NFQXyP/
- Website: https://www.concrete.xyz
- X/Twitter: https://x.com/ConcreteXYZ
Scope
See scope.txt
Files in scope
| File | Logic Contracts | Interfaces | nSLOC | Purpose | Libraries used |
|---|---|---|---|---|---|
| /src/claimRouter/ClaimRouter.sol | 2 | **** | 237 | @openzeppelin/contracts/access/AccessControl.sol<br>@openzeppelin/contracts/utils/math/Math.sol<br>@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol<br>@openzeppelin/contracts/interfaces/IERC20.sol | |
| /src/factories/VaultFactory.sol | 1 | **** | 21 | @openzeppelin/contracts/proxy/Clones.sol<br>@openzeppelin/contracts/access/Ownable.sol | |
| /src/interfaces/Constants.sol | **** | **** | 3 | ||
| /src/interfaces/DataTypes.sol | **** | **** | 23 | ||
| /src/interfaces/Errors.sol | **** | 1 | 67 | @openzeppelin/contracts/interfaces/IERC4626.sol | |
| /src/interfaces/IBeraOracle.sol | **** | 1 | 3 | ||
| /src/interfaces/IClaimRouter.sol | **** | 1 | 10 | ||
| /src/interfaces/IConcreteMultiStrategyVault.sol | **** | 1 | 36 | ||
| /src/interfaces/IImplementationRegistry.sol | **** | 1 | 7 | ||
| /src/interfaces/IMockProtectStrategy.sol | **** | 1 | 4 | ||
| /src/interfaces/IMockStrategy.sol | **** | 1 | 4 | @openzeppelin/contracts/token/ERC20/extensions/ERC4626.sol | |
| /src/interfaces/IProtectStrategy.sol | **** | 1 | 4 | ||
| /src/interfaces/IRewardManager.sol | **** | 1 | 3 | ||
| /src/interfaces/IStrategy.sol | **** | 1 | 8 | @openzeppelin/contracts/token/ERC20/extensions/ERC4626.sol | |
| /src/interfaces/ISwapper.sol | **** | 1 | 3 | ||
| /src/interfaces/ITokenRegistry.sol | **** | 1 | 4 | ||
| /src/interfaces/IVaultDeploymentManager.sol | **** | 1 | 4 | ||
| /src/interfaces/IVaultFactory.sol | **** | 1 | 4 | ||
| /src/interfaces/IVaultRegistry.sol | **** | 1 | 3 | ||
| /src/interfaces/IWithdrawalQueue.sol | **** | 1 | 3 | ||
| /src/managers/DeploymentManager.sol | 1 | **** | 50 | @openzeppelin/contracts/access/Ownable.sol | |
| /src/managers/RewardManager.sol | 2 | **** | 172 | @openzeppelin/contracts/access/Ownable.sol<br>@openzeppelin/contracts/utils/math/SafeCast.sol<br>@openzeppelin/contracts/utils/math/Math.sol | |
| /src/managers/VaultManager.sol | 1 | **** | 106 | @openzeppelin/contracts/access/AccessControl.sol | |
| /src/queue/WithdrawalQueue.sol | 1 | **** | 117 | @openzeppelin/contracts/utils/structs/EnumerableSet.sol<br>@openzeppelin/contracts/utils/math/SafeCast.sol<br>@openzeppelin/contracts/access/Ownable.sol | |
| /src/registries/ImplementationRegistry.sol | 1 | **** | 50 | @openzeppelin/contracts/access/Ownable.sol | |
| /src/registries/TokenRegistry.sol | 2 | **** | 106 | @openzeppelin/contracts/access/Ownable.sol<br>@openzeppelin/contracts/utils/structs/EnumerableSet.sol | |
| /src/registries/VaultRegistry.sol | 1 | **** | 74 | @openzeppelin/contracts/access/Ownable.sol<br>@openzeppelin/contracts/utils/structs/EnumerableSet.sol<br>@openzeppelin/contracts/token/ERC20/extensions/ERC4626.sol | |
| /src/strategies/Aave/AaveV3Strategy.sol | 1 | **** | 73 | @openzeppelin/contracts/token/ERC20/extensions/ERC4626.sol<br>@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol<br>@openzeppelin/contracts/utils/math/Math.sol | |
| /src/strategies/Aave/DataTypes.sol | 1 | **** | 45 | ||
| /src/strategies/Aave/IAaveV3.sol | **** | 7 | 11 | @openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC4626Upgradeable.sol | |
| /src/strategies/ProtectStrategy/ProtectStrategy.sol | 2 | **** | 82 | @openzeppelin/contracts/token/ERC20/extensions/ERC4626.sol<br>@openzeppelin/contracts/utils/math/Math.sol | |
| /src/strategies/Radiant/DataTypes.sol | 1 | **** | 28 | ||
| /src/strategies/Radiant/IRadiantV2.sol | **** | 5 | 9 | @openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC4626Upgradeable.sol | |
| /src/strategies/Radiant/RadiantV2Strategy.sol | 1 | **** | 89 | @openzeppelin/contracts/token/ERC20/extensions/ERC4626.sol<br>@openzeppelin/contracts/utils/math/Math.sol | |
| /src/strategies/Silo/EasyMathV2.sol | 1 | **** | 79 | ||
| /src/strategies/Silo/IBaseSiloV1.sol | **** | 1 | 12 | @openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC4626Upgradeable.sol | |
| /src/strategies/Silo/ISiloV1.sol | **** | 3 | 6 | ||
| /src/strategies/Silo/SiloV1Strategy.sol | 1 | **** | 130 | @openzeppelin/contracts/token/ERC20/extensions/ERC4626.sol<br>@openzeppelin/contracts/utils/math/Math.sol | |
| /src/strategies/StrategyBase.sol | 1 | **** | 187 | @openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC4626Upgradeable.sol<br>@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol<br>@openzeppelin/contracts/utils/math/Math.sol<br>@openzeppelin/contracts/utils/ReentrancyGuard.sol<br>@openzeppelin/contracts-upgradeable/utils/PausableUpgradeable.sol<br>@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol<br>@blueprint-finance/hub-and-spokes-libraries/src/libraries/TokenHelper.sol | |
| /src/strategies/compoundV3/CompoundV3Strategy.sol | 1 | **** | 73 | @openzeppelin/contracts/token/ERC20/extensions/ERC4626.sol<br>@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol<br>@openzeppelin/contracts/utils/math/Math.sol | |
| /src/strategies/compoundV3/ICompoundV3.sol | **** | 5 | 44 | ||
| /src/swapper/OraclePlug.sol | 1 | **** | 60 | @openzeppelin/contracts/utils/math/Math.sol<br>@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol<br>@openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC4626Upgradeable.sol<br>@openzeppelin/contracts/utils/math/SafeCast.sol | |
| /src/swapper/Swapper.sol | 2 | **** | 92 | @openzeppelin/contracts/utils/math/Math.sol<br>@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol<br>@openzeppelin/contracts/utils/ReentrancyGuard.sol<br>@openzeppelin/contracts/token/ERC20/IERC20.sol<br>@openzeppelin/contracts/token/ERC20/extensions/ERC4626.sol<br>@openzeppelin/contracts/access/Ownable.sol | |
| /src/vault/ConcreteMultiStrategyVault.sol | 1 | **** | 568 | @openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC4626Upgradeable.sol<br>@openzeppelin/contracts/utils/ReentrancyGuard.sol<br>@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol<br>@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol<br>@openzeppelin/contracts-upgradeable/utils/PausableUpgradeable.sol<br>@openzeppelin/contracts/utils/math/Math.sol | |
| Totals | 26 | 37 | 2714 |
Files out of scope
See out_of_scope.txt
| File |
|---|
| ./script/Chains.sol |
| ./script/DeployConfig.s.sol |
| ./script/DeployEarn.s.sol |
| ./script/DeployNewVault.s.sol |
| ./script/Deployer.sol |
| ./script/strategies/DeployAaveStratAndAssign.s.sol |
| ./script/strategies/DeployBaseStratAndAssign.s.sol |
| ./script/strategies/DeployCompoundStratAndAssign.s.sol |
| ./script/strategies/DeployProtectStratAndAssign.s.sol |
| ./script/strategies/DeployRadiantStratAndAssign.s.sol |
| ./script/strategies/DeploySiloStratAndAssign.s.sol |
| ./test/ClaimRouter.t.sol |
| ./test/ConcreteMultiStrategyVault.t.sol |
| ./test/DeploymentAndRegistry.t.sol |
| ./test/RewardManager.t.sol |
| ./test/StrategyBase.t.sol |
| ./test/Swapper.t.sol |
| ./test/TokenRegistry.t.sol |
| ./test/VaultManager.t.sol |
| ./test/strategies/AaveV3Strategy.t.sol |
| ./test/strategies/CompoundV3Strategy.t.sol |
| ./test/strategies/ProtectStrategy.t.sol |
| ./test/strategies/RadiantV2Starategy.t.sol |
| ./test/strategies/SiloV1Strategy.t.sol |
| ./test/utils/examples/ExampleStrategyBaseImplementation.sol |
| ./test/utils/mocks/MockBeraOracle.sol |
| ./test/utils/mocks/MockERC20.sol |
| ./test/utils/mocks/MockERC4626.sol |
| ./test/utils/mocks/MockERC4626Protect.sol |
| ./test/utils/mocks/MockERC4626Queue.sol |
| Totals: 30 |
Scoping Q & A
General questions
Are there any ERC20's in scope?: Yes
| Question | Answer |
|---|---|
| ERC20 used by the protocol | Any (all possible ERC20s) |
| Test coverage | 77.45% |
| ERC721 used by the protocol | N/A |
| ERC777 used by the protocol | N/A |
| ERC1155 used by the protocol | N/A |
| Chains the protocol will be deployed on | Ethereum,BSC,Other,ArbitrumCorn |
| Berachain | |
ERC20 token behaviors in scope
| Question | Answer |
|---|---|
| Missing return values | Out of scope |
| Fee on transfer | In scope |
| Balance changes outside of transfers | In scope |
| Upgradeability | In scope |
| Flash minting | Out of scope |
| Pausability | In scope |
| Approval race protections | In scope |
| Revert on approval to zero address | In scope |
| Revert on zero value approvals | In scope |
| Revert on zero value transfers | In scope |
| Revert on transfer to the zero address | In scope |
| Revert on large approvals and/or transfers | In scope |
| Doesn't revert on failure | In scope |
| Multiple token addresses | In scope |
| Low decimals ( < 6) | In scope |
| High decimals ( > 18) | In scope |
| Blocklists | In scope |
External integrations (e.g., Uniswap) behavior in scope
| Question | Answer |
|---|---|
| Enabling/disabling fees (e.g. Blur disables/enables fees) | Yes |
| Pausability (e.g. Uniswap pool gets paused) | Yes |
| Upgradeability (e.g. Uniswap gets upgraded) | Yes |
EIP compliance checklist
| Question | Answer |
|---|---|
| ConcreteMultiStrategyVault.sol | ERC4626 |
| StrategyBase.sol | ERC4626 |
Additional context
Main invariants
The only shareholder of strategies are multi-strategy vaults.
Attack ideas (where to focus for bugs)
- Funds locked
- DoS
- Exploitation of roles
- dust in vaults (possible reverts related to that)
- inadvertent reverts in general
All trusted roles in the protocol
| Role |
|---|
| Owner (multisig) |
Describe any novel or unique curve logic or mathematical models implemented in the contracts
N/A
Running tests
To run the tests, clone the repository. This also downloads the dependency directly into the node_modules/@blueprint-finance/hub-and-spokes-libraries folder. Then install the node js dependencies using yarn or npm (by running yarn install or simply yarn). This will overwrite the node_modules folder, so you need to run git reset --hard to re-instanciate the dependency. Afterwards run any forge command to build, test, or generate coverage.
git clone --recurse https://github.com/code-423n4/2024-11-concrete.git
cd 2024-11-concrete
yarn install
git reset --hard
forge install
forge build
forge test
forge coverage
Miscellaneous
Employees of Concrete and employees' family members are ineligible to participate in this audit.
Code4rena's rules cannot be overridden by the contents of this README. In case of doubt, please check with C4 staff.