🏢 External Security Audit

Audit Type: Professional External Security Audit
Conducted By: Offensive Pulse
Auditor: Andrei Coman (Senior Auditor)
Extension Version: 3.0
Audit Date: December 2, 2025
Status: ✅ ALL FINDINGS RESOLVED
Audit Report: View Full Audit Report

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Executive Summary

Offensive Pulse conducted a comprehensive professional security audit of the SuperSafe Wallet Chrome Extension. The audit combined automated static analysis with 26 hours of manual testing to identify vulnerabilities that could impact user funds or sensitive data.

Overall Risk Assessment: MEDIUM

The audit found no critical vulnerabilities that would allow unauthorized access to user funds or seed phrases. Two MEDIUM severity findings were identified and have been fully remediated.

Category             Rating      Assessment
────────────────────────────────────────────────────────
Architecture         ✅ Good     MetaMask-style thin client with proper separation
Cryptography         ⚠ Moderate AES-256-GCM secure, key derivation improved post-audit
Authorization        ✅ Good     Allowlist-based dApp authorization
Key Management       ✅ Good     Proper isolation and sanitization
Dependencies         ⚠ Moderate 2 CVEs in dev dependencies (not in production)
Session Security     ✅ Good     Auto-lock, rate limiting implemented

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Audit Findings

Critical Findings Summary

ID	Finding	Severity	Status
OP-001	PBKDF2 key derivation below industry standard	⚠ MEDIUM	✅ RESOLVED
OP-002	Source maps enabled in production builds	⚠ MEDIUM	✅ RESOLVED
OP-003	glob CVE (dev dependency)	ℹ INFO	N/A (not in production)
OP-004	vite CVE (dev dependency)	ℹ INFO	✅ RESOLVED

Remediation Status: All findings have been addressed. See Audit Remediation for complete details.

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Part 1: Automated Security Analysis

1.1 Random Number Generation ✅

Objective: Verify cryptographic operations use secure CSPRNG

Result: ✅ VERIFIED SECURE

• All cryptographic random values generated using crypto.getRandomValues()
• Initialization vectors (IV) properly randomized
• Salt generation uses cryptographically secure methods
• Math.random() used only for non-security purposes (request IDs, UI elements, retry jitter)

1.2 PBKDF2 Key Derivation

Objective: Verify consistent and secure key derivation strength

Finding OP-001: Inconsistent PBKDF2 iterations

Severity: MEDIUM

Issue: Vault encryption used lower iteration count than session key derivation. This reduced brute-force resistance for offline vault attacks.

Risk: With the lower iteration count, attackers with access to the encrypted vault could attempt significantly more password guesses per second on consumer GPUs.

Recommendation: Standardize to industry-standard high-iteration PBKDF2 for all key derivation operations.

Status: ✅ RESOLVED — All PBKDF2 operations now use industry-standard iteration counts. See remediation report for verification.

1.3 HD Wallet Derivation Path ✅

Objective: Verify BIP-44 compliance for Ethereum

Result: ✅ VERIFIED CORRECT

• Standard Ethereum BIP-44 path: m/44'/60'/0'/0/{index}
• Correct coin type 60 (ETH)
• Variable account index for multi-account support

1.4 Private Key Storage Security ✅

Objective: Verify private keys never written to insecure storage

Result: ✅ VERIFIED SECURE

localStorage Analysis:

• ✅ 0 matches for private key storage
• ✅ 0 matches for seed phrase storage
• ✅ 0 matches for mnemonic storage
• ✅ Logger sanitization active (no sensitive data in logs)

Conclusion: All private keys and seed phrases stored only in encrypted vault, never in plain text storage.

1.5 Origin Validation & Wildcard Matching ✅

Objective: Verify allowlist cannot be bypassed

Result: ✅ VERIFIED SECURE

Wildcard Matching Test Results:

Pattern	Input	Matches	Correct
*.uniswap.org	app.uniswap.org	✅ Yes	✅
*.uniswap.org	uniswap.org	❌ No	✅
*.uniswap.org	eviluniswap.org	❌ No	✅

Conclusion: Wildcard implementation secure, no bypass vectors identified.

1.6 DOM Security (XSS) ✅

Objective: Check for XSS vulnerabilities

Result: ✅ VERIFIED SAFE

• All dynamic HTML uses safe methods or 100% static content
• No user input interpolated without sanitization
• No external data sources injected into DOM

1.7 Prototype Pollution ✅

Objective: Check for prototype pollution vectors

Result: ✅ VERIFIED SECURE

• 0 matches for __proto__ manipulation
• 0 matches for dangerous Object.assign patterns

1.8 Build Configuration

Objective: Verify production security settings

Finding OP-002: Source maps enabled in production

Severity: MEDIUM

Issue: Source maps were unconditionally enabled in all build configurations, exposing the full source code structure in production builds.

Risk: Exposed code structure aids reverse engineering and vulnerability discovery by attackers.

Recommendation: Disable source maps in production builds while keeping them for development.

Status: ✅ RESOLVED — Source maps now conditionally disabled in production. See remediation report for verification.

1.9 Dependency Vulnerabilities

Objective: Identify CVEs in dependencies

Finding OP-003 & OP-004: Development dependency CVEs

Severity: INFO

CVE ID	Package	Severity	User Impact
GHSA-5j98-mcp5-4vw2	glob 10.2.0-10.4.5	HIGH	❌ None (dev-only)
GHSA-93m4-6634-74q7	vite 6.0.0-6.4.0	MODERATE	✅ Updated to 6.4.1

Assessment: These packages are devDependencies and not bundled into the production extension.

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Part 2: Manual Security Testing

26 hours of hands-on security testing with development tools and test environments

2.1 Cryptographic Testing ✅

Test	Category	Result
Vault migration between iteration counts	Cryptographic	✅ PASSED
AES-GCM with NIST test vectors	Cryptographic	✅ PASSED
Authentication tag validation (oracle attacks)	Cryptographic	✅ PASSED
Key derivation determinism	Cryptographic	✅ PASSED

2.2 Transaction & Signing Security ✅

Test	Category	Result
EIP-155 chainId enforcement	Transaction	✅ PASSED
Transaction parameter validation	Transaction	✅ PASSED
Gas limit manipulation attempts	Transaction	✅ PASSED
personal_sign with hex/non-UTF8 content	Signing	✅ PASSED
eth_signTypedData malformed structures	Signing	✅ PASSED
Trace all private key access paths	Key Management	✅ PASSED

2.3 Session Security ✅

Test	Category	Result
Auto-lock timing accuracy	Session	✅ PASSED
Auto-lock bypass attempts	Session	✅ PASSED
Password brute-force protection	Session	✅ PASSED
Rate limiter bypass attempts	Session	✅ PASSED
Login token generation randomness	Session	✅ PASSED

2.4 dApp Connection Security ✅

Test	Category	Result
Unicode domain homographs	dApp Connection	✅ PASSED
Punycode domain handling	dApp Connection	✅ PASSED
Connection popup spoofing	dApp Connection	✅ PASSED
Race conditions in connections	dApp Connection	✅ PASSED
WalletConnect session persistence	WalletConnect	✅ PASSED

2.5 Storage & Compliance ✅

Test	Category	Result
Audit chrome.storage.local contents	Storage	✅ PASSED
Audit chrome.storage.session contents	Storage	✅ PASSED
Examine IndexedDB databases	Storage	✅ PASSED
Extension update flow	Deployment	✅ PASSED
EIP compliance (1193, 6963, 712)	Compliance	✅ PASSED

Total: All 22 manual tests completed successfully with no additional vulnerabilities discovered.

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Part 3: Security Controls Verified

3.1 Seed Phrase Protection ✅

Layer	Implementation	Status
Content Script Isolation	Seed never passed to content-script.js	✅
Provider Isolation	provider.js has no vault access	✅
Background-only Crypto	All mnemonic operations in service worker	✅
Logger Sanitization	CRITICAL_PATTERNS blocks sensitive data logging	✅

3.2 Signing Protection ✅

Protection	Implementation	Status
Popup Confirmation	SigningRequestManager creates user confirmation popups	✅
Session Lock Check	Operations blocked if wallet locked	✅
Origin Validation	AllowListManager validates all requests	✅
Request Deduplication	Prevents replay attacks	✅

3.3 Transaction Protection ✅

Protection	Implementation	Status
EIP-155 Replay Protection	chainId always included in transactions	✅
Gas Validation	Min/max bounds enforced	✅
User Override	Gas adjustable in confirmation screen	✅

3.4 Rate Limiting ✅

Endpoint	Limit	Lockout
Unlock attempts	5/session	5 minutes
dApp connections	5/minute	5 minutes
eth_requestAccounts	500ms throttle	Deduped

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Industry Security Comparison

Comparison with industry-standard wallet security controls (MetaMask, Trust Wallet):

Feature	MetaMask	Trust Wallet	SuperSafe	Status
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

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Conclusion

Certification Statement

The SuperSafe Wallet Chrome Extension implements security controls comparable to industry-standard wallets. No critical vulnerabilities were identified that would allow unauthorized access to user funds or seed phrases.

The extension is suitable for production deployment. All identified medium-severity findings have been remediated.

User-Facing Risk Summary

Risk	Status
Seed phrase theft via malicious dApp	✅ PROTECTED
Unauthorized transaction signing	✅ PROTECTED
Unauthorized message signing	✅ PROTECTED
Session hijacking	✅ PROTECTED
Offline vault brute-force	✅ PROTECTED (post-audit)

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Audit Methodology

Tools Used

• Static code analysis (automated pattern matching)
• npm audit for dependency scanning
• Manual code review (26 hours)
• Architecture documentation review
• NIST test vector validation
• Browser DevTools security auditing

Files Reviewed

Core Extension Files:

• manifest.json — Permissions and CSP
• background.js — Service worker (~3,500 lines)
• content-script.js — Page bridge
• provider.js — EIP-1193 provider (~1,800 lines)

Security-Critical Components:

• BackgroundSessionController.js — Session management (~4,000 lines)
• SigningRequestManager.js — Signing flows (~600 lines)
• crypto.js — Cryptographic operations
• vaultStorage.js, vaultManager.js — Vault persistence
• loggerSanitizer.js — Log sanitization
• AllowListManager.js — dApp authorization
• ConnectionRateLimiter.js — Rate limiting

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Report Prepared By: Offensive Pulse
Auditor Website: offensivepulse.com
Audit Report: supersafe.offensivepulse.com
Report Version: 1.0
Classification: Security Report

Document Status: ✅ Current as of February 10, 2026
Code Version: v3.1.8 (all findings remediated)