Security Audit Report - LendingPool.sol

# Security Audit Report

DeFi Protocol v2.0

Contract LendingPool.sol
Version 2.0.0
Auditor Fernando Boiero
Organization MIESC Security
Audit Date 2025-12-24
Report ID MIESC-20251224-001

## Executive Summary

55
Risk Score
4
Total Findings
1
Critical
2
High
1
Medium
0
Low

### Overall Risk Assessment

MEDIUM RISK

### Key Statistics

Contract | LendingPool.sol
Lines of Code | 1250
Solidity Version | 0.8.20
Contract Hash (SHA256) | `c73f01f39f62aaea...`
Analysis Tools Used | 3
Security Layers Analyzed | 3

## Methodology

This security audit was conducted using MIESC v4.2.1 (Multi-layer Intelligent Evaluation for Smart Contracts), a comprehensive security analysis framework implementing a Defense-in-Depth strategy across 9 specialized security layers.

### Findings by Security Layer

Static Analysis (Layer 1)
2 findings
Symbolic Execution (Layer 3)
1 findings
DeFi Security (Layer 8)
1 findings

### Findings by Analysis Tool

Slither
2
Mythril
1
DeFiDetector
1

### Analysis Coverage

Layer | Analysis Type | Description
--- | --- | ---
1 | Static Analysis | AST-based vulnerability detection (Slither, Aderyn)
2 | Pattern Detection | Known vulnerability pattern matching
3 | Symbolic Execution | Path exploration and constraint solving (Mythril)
4 | Fuzzing | Property-based testing (Echidna, Medusa)
5 | Formal Verification | Mathematical correctness proofs (Certora, Halmos)
6 | ML Detection | Graph neural network analysis (DA-GNN)
7 | AI Analysis | LLM-powered semantic analysis (SmartLLM)
8 | DeFi Security | Flash loans, MEV, oracle manipulation
9 | Dependency Security | Supply chain vulnerability scanning

## Detailed Findings

### Critical (1)

Critical Reentrancy Vulnerability in withdraw() LendingPool.sol:142

#### Description

The withdraw function makes an external call before updating state, allowing reentrant calls.

SWC: SWC-107 CWE: CWE-841

#### Category

Reentrancy | Detected by: Slither (Layer 1)

#### Vulnerable Code

function withdraw(uint256 amount) external { (bool success,) = msg.sender.call{value: amount}(""); balances[msg.sender] -= amount; // State update after call }

#### Remediation

Apply checks-effects-interactions pattern. Update state before making external calls.

#### References

- https://swcregistry.io/docs/SWC-107

### High (2)

High Integer Overflow in deposit calculation LendingPool.sol:89

#### Description

The deposit function does not check for overflow when calculating interest.

SWC: SWC-101

#### Category

Arithmetic | Detected by: Mythril (Layer 3)

#### Remediation

Use SafeMath or Solidity 0.8+ built-in overflow checks.

High Missing access control on setInterestRate() LendingPool.sol:205

#### Description

The setInterestRate function can be called by any address.

#### Category

Access Control | Detected by: Slither (Layer 1)

#### Remediation

Add onlyOwner or role-based access control modifier.

### Medium (1)

Medium Potential flash loan attack vector LendingPool.sol:312

#### Description

The liquidation function does not implement flash loan protection.

#### Category

DeFi | Detected by: DeFiDetector (Layer 8)

#### Remediation

Add same-block transaction checks or use TWAP for price oracle.

## Raw Tool Outputs (Evidence)

Complete tool outputs preserved for audit trail and verification.

#### Slither

{ "detectors": [ "reentrancy-eth", "missing-zero-check" ] }

#### Mythril

{ "issues": [ { "swc-id": "SWC-101", "severity": "High" } ] }

## Disclaimer

This report is provided for informational purposes only and does not constitute legal, financial, or professional advice. The security analysis was performed using automated tools and should be supplemented with manual code review by qualified security professionals.

Smart contract security is an evolving field. This audit represents a point-in-time assessment and does not guarantee the absence of all vulnerabilities. New attack vectors may emerge after this audit.