CVE-2020-16263
📋 TL;DR
Winston 1.5.4 devices have a misconfigured Cross-Origin Resource Sharing (CORS) policy that accepts requests from any origin, allowing attackers to make cross-origin requests and potentially access sensitive data. This affects all Winston Privacy devices running version 1.5.4 of the software.
💻 Affected Systems
- Winston Privacy
📦 What is this software?
Winston Firmware by Winstonprivacy
⚠️ Risk & Real-World Impact
Worst Case
Attackers could perform cross-site request forgery (CSRF) attacks, steal sensitive user data, or manipulate device settings remotely without user interaction.
Likely Case
Malicious websites could make unauthorized requests to Winston devices, potentially accessing configuration data or performing actions on behalf of authenticated users.
If Mitigated
With proper CORS restrictions, only trusted origins can interact with the device, preventing cross-origin attacks while maintaining legitimate functionality.
🎯 Exploit Status
The vulnerability is simple to exploit via web browser or scripting tools. Public proof-of-concept demonstrates the CORS misconfiguration.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.5.5 or later
Vendor Advisory: https://winstonprivacy.com/
Restart Required: Yes
Instructions:
1. Log into Winston device admin interface
2. Check for firmware updates
3. Apply update to version 1.5.5 or later
4. Reboot device after update completes
🔧 Temporary Workarounds
Network Segmentation
allIsolate Winston devices from untrusted networks and restrict access to trusted origins only
Reverse Proxy with CORS Controls
linuxPlace Winston device behind a reverse proxy that enforces proper CORS headers
# Example nginx configuration
add_header 'Access-Control-Allow-Origin' 'trusted-domain.com' always;
add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range' always;
🧯 If You Can't Patch
- Disable remote administration features if not required
- Implement strict network access controls to limit device exposure
🔍 How to Verify
Check if Vulnerable:
Use browser developer tools or curl to test CORS headers: curl -H 'Origin: https://malicious.com' -I https://winston-device-ip/Check Version:
Check device admin interface or use: curl https://winston-device-ip/api/versionVerify Fix Applied:
Test with same method - should receive proper CORS headers or be rejected📡 Detection & Monitoring
Log Indicators:
- Multiple cross-origin requests from unusual domains
- Failed CORS preflight requests
- Unauthorized API access attempts
Network Indicators:
- HTTP requests with Origin headers to Winston devices
- Cross-origin requests to Winston admin endpoints
SIEM Query:
source="winston.log" AND (http.request.headers.origin="*" OR http.request.headers.origin CONTAINS "http")