Security Review

Review Checklist

Authentication

• Strong password requirements enforced
• MFA implemented for sensitive operations
• Session tokens are cryptographically secure
• Session timeout is appropriate
• Logout properly invalidates session

Authorization

• Access controls checked server-side
• Least privilege principle applied
• Role-based access properly implemented
• Direct object references validated

Input Validation

• All input validated server-side
• Input type and length checked
• Special characters properly handled
• File uploads validated and restricted

Output Encoding

• HTML output properly encoded
• JSON responses use proper content type
• Error messages don't leak information

Cryptography

• Strong algorithms used (AES-256, RSA-2048+)
• No custom crypto implementations
• Keys properly managed
• TLS 1.2+ enforced

Error Handling

• Exceptions handled gracefully
• Error messages don't expose internals
• Failed operations logged

Logging

• Security events logged
• Sensitive data not logged
• Logs protected from tampering

Code Patterns to Flag

SQL Injection

// DANGER
db.query(`SELECT * FROM users WHERE id = ${id}`);

XSS

// DANGER
element.innerHTML = userInput;

Hardcoded Secrets

// DANGER
const API_KEY = "sk-abc123...";

Insecure Random

// DANGER
Math.random(); // For security purposes

Security Review Report

## Security Review: [Component]

### Summary
- Critical: [X]
- High: [X]
- Medium: [X]
- Low: [X]

### Findings

#### [CRITICAL] SQL Injection in UserService
**Location**: src/services/user.ts:47
**Description**: User input concatenated into SQL query
**Remediation**: Use parameterized queries
**Code**:
```typescript
// Current (vulnerable)
// Recommended fix