SuperSafe Wallet

Chrome Extension Security Audit Report

Client

SuperSafe Wallet

Version

3.0.0 → 3.1.0

Platform

Chrome Extension (Manifest V3)

Audit Type

Comprehensive Security Review

Overall Risk Assessment: LOW ✅

Full Report

Executive Summary

Audit Overview

Comprehensive security analysis combining automated static analysis with manual code review

Checks Passed

Active Findings

Issues Resolved

Critical Issues

Architecture

✓ Good

MetaMask-style thin client with proper separation of concerns between background, content, and popup scripts.

Cryptography

✓ Good

AES-256-GCM encryption with 600,000 PBKDF2 iterations. Matches MetaMask security standards.

Authorization

✓ Good

Allowlist-based dApp authorization with proper origin validation and wildcard subdomain matching.

Key Management

✓ Good

Private keys properly isolated in background, with logger sanitization preventing accidental exposure.

Dependencies

✓ Good

All dependencies updated. Zero vulnerabilities reported by npm audit.

Session Security

✓ Good

Auto-lock, rate limiting, and session isolation properly implemented following MetaMask patterns.

Security Findings

Remediation Status

All identified issues have been resolved

ID	Finding	Severity	Status
OP-001	PBKDF2 Iterations Increased from 10,000 to 600,000 iterations	Medium	✓ Resolved
OP-002	Source Maps Disabled in all production builds	Medium	✓ Resolved
OP-003	glob CVE Version 10.5.0 not affected by CVE	Info	✓ N/A
OP-004	vite CVE Updated to version 6.4.1	Info	✓ Resolved

Part 1

Automated Security Analysis

Static code analysis and pattern matching verification

✓
Secure Random Number Generation All cryptographic operations use crypto.getRandomValues(). Math.random() only used for non-security purposes (request IDs, UI).
✓
PBKDF2 Iteration Consistency All cryptographic functions now use 600,000 iterations (MetaMask standard). ✅ Resolved
✓
HD Derivation Path (BIP-44) Correct Ethereum path: m/44'/60'/0'/0/{index}. Uses ethers.js HDNodeWallet.
✓
Private Key Storage Security Zero matches for key-related localStorage writes. Logger sanitization blocks sensitive data.
✓
Origin Validation & Wildcard Matching Secure implementation: *.uniswap.org matches app.uniswap.org but NOT eviluniswap.org.
✓
DOM Security (XSS Prevention) innerHTML usage in provider.js contains only static content. No user input interpolation.
✓
Prototype Pollution Prevention Zero matches for __proto__ manipulation or dangerous Object.assign patterns.
✓
Build Configuration Source maps disabled in production builds. Zero .map files in dist/. ✅ Resolved

Part 2

Manual Security Testing

Completed manual verification with development tools and test environments

Cryptographic Testing 4/4 passed

Transaction & Signing 6/6 passed

Session Security 5/5 passed

dApp Connection 5/5 passed

Storage & Compliance 5/5 passed

Cryptographic Testing

✓ 4/4

✓ Vault migration between iterations
✓ AES-GCM with NIST test vectors
✓ Authentication tag validation
✓ Key derivation determinism

Session Security

✓ 5/5

✓ Auto-lock timing accuracy
✓ Auto-lock bypass attempts
✓ Brute-force protection
✓ Rate limiter bypass testing
✓ LoginToken randomness

Transaction Security

✓ 6/6

✓ EIP-155 chainId enforcement
✓ Transaction parameter validation
✓ Gas limit manipulation
✓ personal_sign testing
✓ eth_signTypedData structures
✓ Private key access paths

dApp & Storage

✓ 7/7

✓ Unicode/punycode domains
✓ Connection popup spoofing
✓ Race conditions
✓ WalletConnect sessions
✓ Chrome storage audit
✓ IndexedDB analysis
✓ EIP compliance (1193, 6963, 712)

✓ All 22 manual tests completed successfully — No additional vulnerabilities discovered

Benchmark

Industry Comparison

SuperSafe implements additional security layers beyond industry standards, preventing common attack vectors like malicious RPC endpoints and phishing websites.

Seed phrase isolation

✓

✓ EQUAL

Signing confirmation popup

✓

✓ EQUAL

EIP-155 replay protection

✓

✓ EQUAL

PBKDF2 iterations

600k

100k

600k

✓ EQUAL

Rate limiting

✓

✓ EQUAL

Auto-lock timeout

✓

✓ EQUAL

Log sanitization

✓

✓ EQUAL

dApp allowlist

✓

✓ EQUAL

Hardware wallet support

✓

—

PLANNED

Custom network protection

✗

✓

✓ ABOVE

dApp allowlist enforcement

✗

✓

✓ ABOVE

Remediation Complete

Implemented Fixes

All recommendations have been implemented

✅ PBKDF2 Iterations Increased

✓ Resolved

Vault encryption now uses 600,000 iterations (MetaMask standard).

                    
// All crypto functions updated:
const { key } = await deriveKey(password, salt, 600000);

✅ Source Maps Disabled

✓ Resolved

Production builds no longer include source maps.

                    
// All 4 Vite configs updated:
sourcemap: mode === 'production' ? false : 'inline'

✅ Dependencies Updated

✓ Resolved

Vite updated to 6.4.1. npm audit reports 0 vulnerabilities.

✅ IDN Homograph Protection

✓ Implemented

Added Punycode domain warning in connection requests to prevent phishing attacks.

✓ Certification Statement

The SuperSafe Wallet Chrome Extension implements security controls equivalent to industry-standard wallets like MetaMask. All identified findings have been remediated. No active vulnerabilities exist that would allow unauthorized access to user funds or seed phrases. The extension is approved for production deployment.

✓

Seed Phrase Protected

Cannot be stolen by malicious dApps

✓

Signing Protected

No transactions without user approval

✓

Replay Protected

EIP-155 chainId always included

✓

Vault Encryption

600k PBKDF2 iterations