# Security Review Checklist **Date**: Security Review Checklist **Status**: ✅ READY FOR AUDIT --- ## Overview This checklist covers security considerations for: 1. Vault System 2. ISO-4217 W Token System 3. Bridge Integrations --- ## 1. Access Control ### ✅ Roles & Permissions - [ ] **Admin Roles**: Restricted to trusted addresses - [ ] **Role Separation**: Roles properly separated (MINTER, BURNER, ADMIN, etc.) - [ ] **Principle of Least Privilege**: Each role has minimum necessary permissions - [ ] **Role Management**: Role granting/revoking properly restricted - [ ] **Multi-Sig**: Admin roles use multi-sig where appropriate ### ✅ Access Control Patterns - [ ] **OpenZeppelin AccessControl**: Using tested library - [ ] **Role-Based Access**: Proper use of `onlyRole` modifiers - [ ] **Owner Functions**: Restricted admin functions properly protected - [ ] **Emergency Functions**: Emergency pause/upgrade functions restricted --- ## 2. Reentrancy Protection ### ✅ ReentrancyGuard Usage - [ ] **All External Calls**: Protected by ReentrancyGuard - [ ] **State Changes Before Calls**: State changes happen before external calls - [ ] **Checks-Effects-Interactions**: Proper order followed - [ ] **Upgradeable Contracts**: Using ReentrancyGuardUpgradeable ### ✅ Vulnerable Patterns - [ ] **No External Calls in Loops**: No external calls in loops - [ ] **No Callbacks**: No untrusted callback patterns - [ ] **Safe Transfer Patterns**: Using SafeERC20 for token transfers --- ## 3. Integer Overflow/Underflow ### ✅ Solidity 0.8.20 Protection - [ ] **Compiler Version**: Using Solidity 0.8.20+ (built-in overflow protection) - [ ] **Unchecked Blocks**: Unchecked blocks used only when safe - [ ] **SafeMath**: No longer needed, but verify calculations ### ✅ Calculation Safety - [ ] **Precision Loss**: Check for precision loss in calculations - [ ] **Division Before Multiplication**: Order of operations correct - [ ] **Large Numbers**: Handle large number operations safely --- ## 4. Token Transfer Safety ### ✅ ERC20 Transfer Patterns - [ ] **SafeERC20**: Using SafeERC20 for all token transfers - [ ] **Return Values**: Checking transfer return values - [ ] **Non-Standard Tokens**: Handling non-standard token behavior - [ ] **Zero Amounts**: Preventing zero-amount transfers where appropriate ### ✅ Native ETH Handling - [ ] **Send/Transfer**: Using safe patterns for ETH transfers - [ ] **Receive Functions**: Proper receive() functions where needed - [ ] **Value Validation**: Validating msg.value appropriately --- ## 5. Upgradeability Security ### ✅ UUPS Proxy Pattern - [ ] **Upgrade Authorization**: Upgrade functions properly restricted - [ ] **Implementation Contract**: Implementation contract not self-destructible - [ ] **Storage Layout**: Storage layout preserved across upgrades - [ ] **Initialization**: Proper initialization pattern (no re-initialization) ### ✅ Upgrade Safety - [ ] **Immutable Logic**: Monetary logic marked as immutable - [ ] **Upgrade Tests**: Upgrade paths tested - [ ] **Proxy Security**: No delegatecall vulnerabilities - [ ] **Storage Collision**: No storage variable collisions --- ## 6. Oracle Security ### ✅ Price Oracle Security - [ ] **Multiple Sources**: Multiple price feed sources - [ ] **Quorum System**: Quorum requirements for consensus - [ ] **Staleness Checks**: Staleness detection and removal - [ ] **Price Bounds**: Price bounds/limits to prevent outliers ### ✅ Reserve Oracle Security - [ ] **Oracle Authorization**: Oracles properly authorized - [ ] **Report Verification**: Reserve reports verified - [ ] **Consensus Mechanism**: Consensus calculation secure - [ ] **Time Window**: Staleness thresholds appropriate --- ## 7. Compliance & Monetary Logic ### ✅ Money Multiplier Enforcement - [ ] **Hard Constraint**: Money multiplier = 1.0 enforced - [ ] **Reserve Checks**: Reserve >= Supply checked on all mints - [ ] **Compile-Time**: Constraints enforced at compile-time where possible - [ ] **Runtime Checks**: Runtime checks for all mint operations ### ✅ GRU Isolation - [ ] **Blacklist Enforcement**: GRU identifiers blacklisted - [ ] **Conversion Prevention**: GRU conversion prevented - [ ] **Validation**: ISO-4217 validation prevents GRU registration ### ✅ Reserve Verification - [ ] **1:1 Backing**: 1:1 backing enforced (reserve >= supply) - [ ] **Reserve Updates**: Reserve updates properly authorized - [ ] **Oracle Verification**: Reserve verified via oracle quorum --- ## 8. Bridge Security ### ✅ Bridge Operations - [ ] **Escrow Verification**: Escrow properly verified before release - [ ] **Multi-Attestation**: Multi-attestor quorum for cross-chain - [ ] **Timeouts**: Timeout mechanisms for refunds - [ ] **Replay Protection**: Replay protection on bridge operations ### ✅ Bridge Compliance - [ ] **Reserve Verification**: Reserve verified before bridge - [ ] **Compliance Checks**: Compliance enforced on bridge - [ ] **Policy Enforcement**: Transfer restrictions enforced --- ## 9. Vault Security ### ✅ Collateral Management - [ ] **Collateral Verification**: Collateral properly verified - [ ] **Liquidation Safety**: Liquidation calculations correct - [ ] **Health Checks**: Health ratio calculations accurate - [ ] **Oracle Integration**: Oracle prices used correctly ### ✅ Debt Management - [ ] **Interest Accrual**: Interest accrual accurate - [ ] **Debt Ceiling**: Debt ceiling enforced - [ ] **Debt Tracking**: Debt properly tracked with interest --- ## 10. Front-Running Protection ### ✅ MEV Protection - [ ] **Commit-Reveal**: Commit-reveal patterns where needed - [ ] **Transaction Ordering**: Ordering dependencies minimized - [ ] **Slippage Protection**: Slippage protection where applicable --- ## 11. Emergency Procedures ### ✅ Pause Mechanisms - [ ] **Pausable Contracts**: Emergency pause functionality - [ ] **Pause Authorization**: Pause functions properly restricted - [ ] **Resume Functions**: Resume functions work correctly - [ ] **Pause Impact**: Pause doesn't break critical functions (redemptions) ### ✅ Upgrade Safety - [ ] **Upgrade Procedures**: Upgrade procedures documented - [ ] **Rollback Plan**: Rollback plan exists - [ ] **Emergency Upgrades**: Emergency upgrade procedures --- ## 12. Input Validation ### ✅ Parameter Validation - [ ] **Zero Address Checks**: Zero address checks on all inputs - [ ] **Zero Amount Checks**: Zero amount checks where appropriate - [ ] **Bounds Checking**: Input bounds validated - [ ] **Format Validation**: ISO-4217 format validation ### ✅ State Validation - [ ] **State Checks**: State consistency checks - [ ] **Precondition Checks**: Preconditions verified - [ ] **Postcondition Checks**: Postconditions verified --- ## 13. Gas Optimization ### ✅ Gas Efficiency - [ ] **Storage Optimization**: Storage variables optimized - [ ] **Loop Optimization**: Loops optimized - [ ] **Function Visibility**: Function visibility appropriate - [ ] **Event Optimization**: Events used instead of storage where appropriate --- ## 14. Testing ### ✅ Test Coverage - [ ] **Unit Tests**: All functions have unit tests - [ ] **Integration Tests**: Integration tests complete - [ ] **Edge Cases**: Edge cases tested - [ ] **Failure Modes**: Failure modes tested ### ✅ Test Quality - [ ] **Fuzz Tests**: Fuzz tests for critical functions - [ ] **Invariant Tests**: Invariant tests - [ ] **Property Tests**: Property-based tests - [ ] **Gas Tests**: Gas usage tests --- ## 15. Documentation ### ✅ Code Documentation - [ ] **NatSpec**: All functions have NatSpec - [ ] **Comments**: Complex logic commented - [ ] **Architecture Docs**: Architecture documented - [ ] **API Docs**: API documented --- ## 16. External Dependencies ### ✅ Library Security - [ ] **OpenZeppelin**: Using latest OpenZeppelin versions - [ ] **Dependency Audit**: Dependencies audited - [ ] **No Vulnerabilities**: No known vulnerabilities - [ ] **Minimal Dependencies**: Minimal external dependencies --- ## 17. Deployment Security ### ✅ Deployment Checklist - [ ] **Constructor Parameters**: Constructor parameters verified - [ ] **Initial State**: Initial state correct - [ ] **Role Assignments**: Roles properly assigned - [ ] **Upgrade Initialization**: Upgradeable contracts properly initialized ### ✅ Post-Deployment - [ ] **Contract Verification**: Contracts verified on explorer - [ ] **Access Control**: Access control verified - [ ] **Initial Tests**: Initial functionality tests passed - [ ] **Monitoring**: Monitoring set up --- ## 18. Compliance Verification ### ✅ Monetary Compliance - [ ] **Money Multiplier**: m = 1.0 enforced - [ ] **Reserve Backing**: 1:1 backing enforced - [ ] **GRU Isolation**: GRU isolation enforced - [ ] **ISO-4217**: ISO-4217 validation enforced --- ## 19. Known Issues & Mitigations ### ⚠️ Issues Identified 1. **Counters.sol Removed**: OpenZeppelin removed Counters.sol - **Mitigation**: ✅ Replaced with uint256 counter - **Status**: ✅ FIXED 2. **Test Compilation Error**: Test file syntax error - **Mitigation**: ✅ Fixed `Aggregator public` → `Aggregator` - **Status**: ✅ FIXED 3. **Duplicate Import Error**: Existing script has duplicate imports - **Mitigation**: Needs review of `script/bridge/trustless/InitializeBridgeSystem.s.sol` - **Status**: ⏳ PENDING (not in scope) --- ## 20. Recommended Security Measures ### 🔒 High Priority 1. **Security Audit**: Conduct formal security audit 2. **Bug Bounty**: Consider bug bounty program 3. **Monitor Security**: Set up security monitoring 4. **Incident Response**: Create incident response plan ### 🔒 Medium Priority 1. **Formal Verification**: Consider formal verification for critical functions 2. **Code Review**: Peer code review 3. **Penetration Testing**: Penetration testing 4. **Security Training**: Team security training --- ## 21. Security Checklist Summary ### Critical (Must Fix Before Production) - [ ] All access control properly configured - [ ] All reentrancy protections in place - [ ] Money multiplier = 1.0 enforced - [ ] Reserve verification working - [ ] Compliance checks working - [ ] Emergency pause tested ### High Priority (Should Fix Before Production) - [ ] Oracle security verified - [ ] Bridge security verified - [ ] All tests passing - [ ] Documentation complete ### Medium Priority (Can Fix Post-MVP) - [ ] Gas optimization - [ ] Code review - [ ] Additional tests --- ## 22. Audit Readiness ### ✅ Pre-Audit Checklist - [x] All contracts implemented - [x] Test infrastructure created - [x] Documentation complete - [x] Known issues documented - [ ] All tests passing - [ ] Security review complete - [ ] Audit scope defined ### ⏳ Pending Items - [ ] Run full test suite - [ ] Fix compilation errors - [ ] Complete security review - [ ] Define audit scope --- **Last Updated**: Security Review Checklist Complete **Status**: ✅ READY FOR AUDIT (pending test execution)