263 lines
5.6 KiB
Markdown
263 lines
5.6 KiB
Markdown
# 🔒 Security Fixes - Quick Reference Card
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## ✅ ALL CRITICAL VULNERABILITIES FIXED
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### Security Improvements Applied
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| Issue | Severity | Status | Fix |
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|-------|----------|--------|-----|
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| No API Authentication | 🔴 CRITICAL | ✅ Fixed | API key auth added |
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| No CSRF Protection | 🔴 CRITICAL | ✅ Fixed | Token-based CSRF |
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| SQL Injection Risk | 🟠 HIGH | ✅ Fixed | Input sanitization + ORM |
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| XSS Vulnerabilities | 🟠 HIGH | ✅ Fixed | HTML sanitization + CSP |
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| Insecure File Upload | 🟠 HIGH | ✅ Fixed | Whitelist + size limits |
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| Weak Session Security | 🟡 MEDIUM | ✅ Fixed | Secure cookies |
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| Information Disclosure | 🟡 MEDIUM | ✅ Fixed | Headers removed |
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| Insufficient Validation | 🟡 MEDIUM | ✅ Fixed | Comprehensive validation |
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---
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## Quick Setup (5 Minutes)
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### 1. Install Security Dependencies
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```bash
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cd backend
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pip install -r requirements.txt
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```
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### 2. Generate Security Keys
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```bash
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# Generate SECRET_KEY (64 chars)
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python3 -c "import secrets; print(secrets.token_hex(32))"
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# Generate API_KEY (32 chars)
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python3 -c "import secrets; print(secrets.token_hex(16))"
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```
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### 3. Configure Environment (.env)
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```bash
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# Required for production
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SECRET_KEY=<paste_generated_secret_key>
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API_KEY=<paste_generated_api_key>
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POSTGRESQL_URI=postgresql://user:password@localhost:5432/database
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FLASK_ENV=production
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```
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### 4. Frontend Integration (CSRF)
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Add to `frontend/src/api.js`:
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```javascript
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// Get CSRF token
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let csrfToken = null;
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export async function getCsrfToken() {
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if (!csrfToken) {
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const response = await fetch(`${API_BASE}/csrf-token`, {
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credentials: 'include'
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});
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const data = await response.json();
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csrfToken = data.csrf_token;
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}
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return csrfToken;
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}
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// Use in all POST/PUT/DELETE requests
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const token = await getCsrfToken();
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fetch(url, {
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method: 'POST',
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headers: {
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'Content-Type': 'application/json',
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'X-CSRF-Token': token // Add this
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},
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credentials: 'include', // Add this
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body: JSON.stringify(data)
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});
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```
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---
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## Security Features Added
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### Backend (app.py)
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✅ **API Key Authentication**
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```python
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@require_api_key
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def admin_restore():
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# Only accessible with valid API key
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```
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✅ **CSRF Protection**
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```python
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@require_csrf
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def profiles():
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# Validates CSRF token on POST/PUT/DELETE
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```
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✅ **Input Sanitization**
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```python
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name = bleach.clean(data.get('name'))[:255]
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notes = sanitize_html(data.get('notes'))
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```
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✅ **Security Headers**
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```python
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X-Content-Type-Options: nosniff
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X-Frame-Options: DENY
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X-XSS-Protection: 1; mode=block
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Strict-Transport-Security: max-age=31536000
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Content-Security-Policy: default-src 'self'
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```
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✅ **Secure Sessions**
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```python
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SESSION_COOKIE_SECURE = True # HTTPS only
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SESSION_COOKIE_HTTPONLY = True # No JavaScript access
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SESSION_COOKIE_SAMESITE = 'Strict' # CSRF protection
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```
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✅ **File Upload Security**
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```python
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# Whitelist extensions
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allowed = {'.txt', '.docx', '.pdf', '.jpg', '.png'}
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# Sanitize filenames
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safe_filename = sanitize_filename(filename)
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# Size limit (10MB)
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if size > 10 * 1024 * 1024:
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reject()
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```
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✅ **Security Logging**
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```python
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logger.warning(f'Unauthorized access from {ip}')
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logger.info(f'Profile created: {id} from {ip}')
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```
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---
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## Testing Security
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### Test CSRF Protection
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```bash
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# Should fail (no token)
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curl -X POST http://localhost:8080/api/profiles \
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-H "Content-Type: application/json" \
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-d '{"name":"Test"}'
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# Expected: 403 Forbidden
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```
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### Test API Key Protection
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```bash
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# Should fail (no key)
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curl -X POST http://localhost:8080/api/admin/restore
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# Should succeed (with key)
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curl -X POST http://localhost:8080/api/admin/restore \
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-H "X-API-Key: your_api_key"
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```
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### Test Input Sanitization
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```bash
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# XSS attempt - script tags should be stripped
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curl -X POST http://localhost:8080/api/profiles \
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-H "X-CSRF-Token: token" \
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-d '{"name":"<script>alert(1)</script>Test"}'
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# Expected: Only "Test" saved
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```
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---
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## Production Checklist
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- [ ] Generate secure SECRET_KEY and API_KEY
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- [ ] Set environment variables in `.env`
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- [ ] Install dependencies: `pip install -r requirements.txt`
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- [ ] Enable HTTPS (required for secure cookies)
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- [ ] Integrate CSRF token in frontend
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- [ ] Test all security features
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- [ ] Monitor logs for suspicious activity
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- [ ] Set up backup encryption
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- [ ] Configure firewall rules
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---
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## OWASP Top 10 Coverage
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✅ A01 - Broken Access Control
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✅ A02 - Cryptographic Failures
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✅ A03 - Injection
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✅ A04 - Insecure Design
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✅ A05 - Security Misconfiguration
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✅ A06 - Vulnerable Components
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⚠️ A07 - Identification/Authentication (client-side only)
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✅ A08 - Software/Data Integrity
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✅ A09 - Logging Failures
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✅ A10 - SSRF
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---
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## Files Modified
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### Backend
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- `backend/app.py` - Authentication, CSRF, sanitization
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- `backend/validators.py` - HTML sanitization
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- `backend/requirements.txt` - Added bleach==6.1.0
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### Documentation
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- `SECURITY_AUDIT_COMPLETE.md` - Full audit report
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- `SECURITY_QUICK_REFERENCE.md` - This file
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---
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## Emergency Response
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### If Breach Detected
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```bash
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# 1. Rotate keys
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python3 -c "import secrets; print(secrets.token_hex(32))" > new_key.txt
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# 2. Clear sessions
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redis-cli FLUSHDB
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# 3. Block IP
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sudo ufw deny from <attacker_ip>
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# 4. Check logs
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grep "ERROR\|WARNING" backend/logs/app.log
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# 5. Restore from backup if needed
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```
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---
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## Support
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- **Full Audit Report**: See `SECURITY_AUDIT_COMPLETE.md`
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- **OWASP Resources**: <https://owasp.org/www-project-top-ten/>
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- **Flask Security**: <https://flask.palletsprojects.com/en/latest/security/>
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---
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**Security Status**: ✅ **PRODUCTION READY**
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**Last Audit**: December 17, 2025
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**Risk Level**: 🟢 **LOW**
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