CVE-2020-26732
📋 TL;DR
This vulnerability in SKYWORTH GN542VF routers exposes session cookies to interception because the Secure flag is not set on HTTPS cookies. Attackers can capture these cookies during transmission, potentially hijacking user sessions. All users of affected SKYWORTH router hardware and software versions are impacted.
💻 Affected Systems
- SKYWORTH GN542VF
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers intercept session cookies and gain unauthorized access to router admin interface, allowing them to change network settings, intercept traffic, or install malware.
Likely Case
Session hijacking where attackers capture user sessions to access router management interface or user accounts.
If Mitigated
Limited impact if network segmentation prevents external access and internal users are trusted.
🎯 Exploit Status
Exploitation requires man-in-the-middle position to intercept cookies.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Check vendor website for firmware updates.
🔧 Temporary Workarounds
Network Segmentation
allIsolate router management interface from untrusted networks
Access Restriction
allRestrict access to router admin interface to trusted IPs only
🧯 If You Can't Patch
- Disable remote management of router if not required
- Use VPN for all router administration to encrypt traffic
🔍 How to Verify
Check if Vulnerable:
Inspect router web interface cookies using browser developer tools - check if session cookies lack Secure flagCheck Version:
Check router web interface for firmware version informationVerify Fix Applied:
Verify cookies now have Secure flag set when using HTTPS📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts from unusual locations
- Configuration changes from unexpected IP addresses
Network Indicators:
- Unencrypted HTTP traffic containing session cookies
- Traffic interception attempts
SIEM Query:
Search for router login events from unexpected IPs or multiple failed authentication attempts