mev-beta/TODO_AUDIT_FIX.md

Security Audit Fix TODO List

Generated from: MEV Bot Comprehensive Security Audit (October 9, 2025) Priority Order: Critical → High → Medium → Low

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🔴 CRITICAL PRIORITY (Fix Before ANY Deployment)

CRITICAL-001: Integer Overflow Vulnerabilities

Status: ✅ Completed Estimated Time: 4-6 hours Assigned: TBD

Files to Fix:

• pkg/arbitrum/l2_parser.go:827 - uint64 to uint32 conversion
• pkg/validation/input_validator.go:556 - Gas calculation overflow
• pkg/validation/input_validator.go:552 - Gas calculation overflow
• pkg/transport/benchmarks.go:271 - Memory usage calculation
• pkg/security/transaction_security.go:248 - Gas cost calculation
• pkg/profitcalc/profit_calc.go:251 - Gas limit conversion
• pkg/profitcalc/profit_calc.go:178 - Additional gas cost
• pkg/mev/competition.go:207 - Total cost calculation
• pkg/mev/competition.go:179 - Total cost calculation
• pkg/mev/competition.go:144 - Gas cost calculation
• pkg/math/arbitrage_calculator.go:296 - Total gas conversion
• pkg/contracts/executor.go:364 - Nonce conversion
• pkg/arbitrum/profitability_tracker.go:479 - Average profit calculation

Implementation Tasks:

• Create pkg/security/safe_conversions.go with safe conversion functions
• Add bounds checking for all uint64 → uint32/int64 conversions
• Update all affected calculation functions to use safe conversions
• Add unit tests for overflow detection
• Update error handling for conversion failures

✅ CRITICAL-001a: Swap Event Parsing Integer Issues (COMPLETED)

Status: ✅ Fixed Completed: October 9, 2025 Fixed Files:

• pkg/arbitrage/service.go:1167-1168 - Fixed unsigned parsing of signed amount0/amount1
• pkg/arbitrage/service.go:1174-1177 - Fixed improper tick conversion from int24
• pkg/arbitrage/service.go:1460-1461 - Fixed parseSwapEvent function
• pkg/arbitrage/service.go:1467-1470 - Fixed second instance of amount parsing
• pkg/arbitrage/service.go:1207-1251 - Added parseSignedInt256 and parseSignedInt24 helper functions

What Was Fixed:

• Replaced new(big.Int).SetBytes() with proper signed integer parsing for UniswapV3 amount0/amount1
• Fixed tick conversion from int24 stored in int256 format using proper bit manipulation
• Added comprehensive validation and error handling for all signed integer conversions
• Implemented two's complement conversion for negative values
• Added range validation for int24 tick values (-8388608 to 8388607)

✅ CRITICAL-002: Multicall Parsing Corruption Issues (COMPLETED)

Status: ✅ Fixed Estimated Time: 6-8 hours Completed: October 16, 2025

Files Fixed:

• pkg/calldata/multicall.go:366-440 - Heuristic address extraction corruption
• pkg/calldata/multicall.go:98-129 - Multicall ABI decoding failures
• pkg/calldata/multicall.go:480-494 - Address validation logging spam
• pkg/arbitrum/abi_decoder.go:185-238 - Missing multicall signatures
• internal/validation/address.go:468-476 - Overly aggressive corruption scoring

Implementation Tasks Completed:

• Fix bounds checking in heuristicExtractTokens function
• Add missing Universal Router and multicall signatures to ABI decoder
• Implement graduated validation thresholds (15/30/50 for different operations)
• Add proper error recovery for partial multicall parsing failures
• Implement caching for known good/bad address patterns
• Add structured logging for multicall parsing diagnostics

What Was Fixed:

• Enhanced bounds checking prevents buffer overruns and corrupted address extraction
• Added comprehensive Universal Router and Arbitrum DEX function signatures
• Implemented three-tier validation system (Strict/Moderate/Permissive) based on operation context
• Added multi-layer error recovery with fallback extraction methods
• Implemented LRU-based caching system to avoid repeated address validation
• Fixed duplicate function declarations and import cleanup

Test Results:

• All multicall parsing tests passing
• Enhanced test coverage for edge cases and suspicious address handling
• Verified correct rejection of corrupted addresses while allowing legitimate ones

CRITICAL-003: Unhandled Error Conditions

Status: ❌ Not Fixed Estimated Time: 8-10 hours Assigned: TBD

Critical Error Handling Fixes:

• pkg/lifecycle/shutdown_manager.go:460 - OnShutdownCompleted hook
• pkg/lifecycle/shutdown_manager.go:457 - OnShutdownFailed hook
• pkg/lifecycle/shutdown_manager.go:396 - ForceShutdown call
• pkg/lifecycle/shutdown_manager.go:388 - ForceShutdown in timeout
• pkg/lifecycle/shutdown_manager.go:192 - StopAll call
• pkg/lifecycle/module_registry.go:729-733 - Event publishing
• pkg/lifecycle/module_registry.go:646-653 - Module started event
• pkg/lifecycle/module_registry.go:641 - Health monitoring start
• pkg/lifecycle/health_monitor.go:550 - Health change notification
• pkg/lifecycle/health_monitor.go:444 - System health notification

Implementation Tasks:

• Add proper error handling and logging for all identified locations
• Implement graceful degradation for non-critical failures
• Add retry mechanisms where appropriate
• Create error aggregation and reporting system
• Add monitoring alerts for repeated failures

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🟠 HIGH PRIORITY (Fix Before Production)

HIGH-001: Private Key Memory Security

Status: ❌ Not Fixed Estimated Time: 2-3 hours Assigned: TBD

Tasks:

• Enhance clearPrivateKey() function in pkg/security/keymanager.go
• Implement secure memory zeroing for big.Int private key data
• Add memory protection for key material during operations
• Create unit tests for memory clearing verification
• Add memory usage monitoring for key operations

HIGH-002: Race Condition Fixes

Status: ❌ Not Fixed Estimated Time: 4-5 hours Assigned: TBD

Files to Review:

• pkg/security/keymanager.go:481,526,531 - Atomic operation consistency
• pkg/arbitrage/service.go - Shared state protection
• pkg/scanner/concurrent.go - Worker pool synchronization
• pkg/transport/provider_manager.go - Connection state management

Tasks:

• Review all shared state access patterns
• Replace inconsistent atomic usage with proper synchronization
• Add race detection tests to CI pipeline
• Implement proper read-write lock usage where needed

HIGH-003: Chain ID Validation Enhancement

Status: ❌ Not Fixed Estimated Time: 2 hours Assigned: TBD

Tasks:

• Add comprehensive chain ID validation in transaction signing
• Implement EIP-155 replay protection verification
• Add chain ID mismatch detection and alerts
• Create tests for cross-chain replay attack prevention

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🟡 MEDIUM PRIORITY (Security Improvements)

MEDIUM-001: Rate Limiting Enhancement

Status: ❌ Not Fixed Estimated Time: 3-4 hours Assigned: TBD

Tasks:

• Implement sliding window rate limiting in pkg/security/keymanager.go:781-823
• Add distributed rate limiting support for multiple instances
• Implement adaptive rate limiting based on system load
• Add rate limiting bypass detection and alerting

MEDIUM-002: Input Validation Strengthening

Status: ❌ Not Fixed Estimated Time: 4-5 hours Assigned: TBD

Tasks:

• Enhance ABI decoding validation throughout parsing modules
• Add comprehensive bounds checking for external data
• Implement input sanitization for log messages
• Create fuzzing test suite for all input validation functions

MEDIUM-003: Sensitive Information Logging

Status: ❌ Not Fixed Estimated Time: 2-3 hours Assigned: TBD

Tasks:

• Implement log sanitization for addresses and transaction data
• Add configurable log level filtering for sensitive information
• Create secure audit logging format
• Implement log encryption for sensitive audit trails

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🟢 LOW PRIORITY (Code Quality & Maintenance)

LOW-001: Code Quality Improvements

Status: ❌ Not Fixed Estimated Time: 6-8 hours Assigned: TBD

Static Analysis Fixes:

• Fix unused function warnings from staticcheck
• Remove dead code and unused variables
• Improve error message formatting (capitalization)
• Add missing documentation for exported functions

LOW-002: Testing Infrastructure

Status: ❌ Not Fixed Estimated Time: 8-10 hours Assigned: TBD

Tasks:

• Expand fuzzing test coverage for all critical components
• Add property-based testing for mathematical operations
• Implement integration security test suite
• Create performance regression tests for security features

LOW-003: Monitoring & Observability

Status: ❌ Not Fixed Estimated Time: 6-8 hours Assigned: TBD

Tasks:

• Add security event metrics and dashboards
• Implement anomaly detection for unusual transaction patterns
• Create security audit log analysis tools
• Add performance monitoring for security operations

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📋 Implementation Plan

Phase 1: Critical Fixes (Week 1)

Total Estimated Time: 18-24 hours

1. Integer overflow vulnerability fixes
2. Multicall parsing corruption fixes
3. Critical error handling implementation
4. Basic testing for critical fixes

Phase 2: High Priority Security (Week 2)

Total Estimated Time: 8-10 hours

1. Private key memory security enhancements
2. Race condition fixes
3. Chain ID validation improvements

Phase 3: Medium Priority Improvements (Week 3-4)

Total Estimated Time: 9-12 hours

1. Rate limiting enhancements
2. Input validation strengthening
3. Logging security improvements

Phase 4: Quality & Maintenance (Ongoing)

Total Estimated Time: 20-26 hours

1. Code quality improvements
2. Testing infrastructure expansion
3. Monitoring and observability enhancements

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🧪 Testing Requirements

Required Tests for Each Fix:

• Unit tests for all modified functions
• Integration tests for security flows
• Regression tests for existing functionality
• Performance tests to ensure no degradation
• Security-specific test cases for vulnerability verification

Automated Testing Pipeline:

• Add security linting to pre-commit hooks
• Include fuzzing tests in CI pipeline
• Add race detection to all test runs
• Implement security regression testing

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📊 Progress Tracking

Overall Progress: 35% Complete 🟢

Critical: 2/4 ✅ (Swap parsing + Multicall parsing fixed) High: 0/3 ❌ Medium: 0/3 ❌ Low: 0/3 ❌

Milestones:

• Milestone 0: Swap event parsing fixes (Critical subset) ✅
• Milestone 0.5: Multicall parsing corruption analysis and fix plan ✅
• Milestone 1: Multicall parsing corruption fixes implemented and tested ✅
• Milestone 2: All critical fixes implemented and tested
• Milestone 2: High priority security improvements complete
• Milestone 3: Medium priority enhancements deployed
• Milestone 4: Low priority improvements and maintenance complete

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💡 Notes & Reminders

• Before starting: Create feature branch for security fixes
• Testing approach: Fix → Test → Review → Deploy
• Code review: All security fixes require peer review
• Documentation: Update security documentation after each phase
• Rollback plan: Maintain ability to rollback any changes quickly

Next Steps:

1. Assign team members to critical priority items
2. Set up dedicated security-fixes branch
3. Begin with multicall parsing fixes (immediate impact on arbitrage detection)
4. Continue with integer overflow fixes (highest security impact)
5. Implement comprehensive testing for each fix
6. Schedule code reviews for all security modifications

Recent Updates:

• October 16, 2025: Added CRITICAL-002 for multicall parsing corruption issues
• October 16, 2025: Completed comprehensive analysis of multicall parsing failures
• October 16, 2025: Identified root cause: heuristic address extraction generating corrupted addresses

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Last Updated: October 16, 2025 Review Schedule: Weekly during active fixes, monthly after completion