CVE-2022-34045
📋 TL;DR
This vulnerability involves a hardcoded encryption key in Wavlink routers that allows attackers to decrypt configuration files and potentially gain administrative access. It affects Wavlink WN530HG4 routers running specific firmware versions. Attackers can exploit this to compromise router settings and network security.
💻 Affected Systems
- Wavlink WN530HG4
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise leading to network takeover, credential theft, man-in-the-middle attacks, and lateral movement to connected devices.
Likely Case
Unauthorized access to router configuration, modification of network settings, DNS hijacking, and potential credential exposure.
If Mitigated
Limited impact if routers are behind firewalls with strict access controls and configuration files are properly secured.
🎯 Exploit Status
The hardcoded key is publicly documented, making exploitation straightforward for attackers with access to configuration files.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No vendor advisory found
Restart Required: Yes
Instructions:
1. Check Wavlink website for firmware updates. 2. Download latest firmware. 3. Access router admin interface. 4. Upload and apply firmware update. 5. Reboot router.
🔧 Temporary Workarounds
Restrict Access to Configuration Files
linuxLimit access to the ExportAllSettings.sh script and configuration files
chmod 600 /etc_ro/lighttpd/www/cgi-bin/ExportAllSettings.sh
chmod 600 /etc_ro/lighttpd/www/cgi-bin/*
Disable Unnecessary Services
linuxTurn off CGI scripts and web interfaces not required for operation
mv /etc_ro/lighttpd/www/cgi-bin/ExportAllSettings.sh /etc_ro/lighttpd/www/cgi-bin/ExportAllSettings.sh.disabled
🧯 If You Can't Patch
- Isolate affected routers in separate network segments with strict firewall rules
- Implement network monitoring for unauthorized configuration changes and unusual router access patterns
🔍 How to Verify
Check if Vulnerable:
Check if file /etc_ro/lighttpd/www/cgi-bin/ExportAllSettings.sh exists and contains hardcoded encryption keysCheck Version:
Check router web interface or run 'cat /proc/version' via SSH if availableVerify Fix Applied:
Verify the hardcoded key has been removed from the script and configuration files are properly encrypted with unique keys📡 Detection & Monitoring
Log Indicators:
- Unauthorized access to CGI scripts
- Configuration file export attempts
- Unusual admin login patterns
Network Indicators:
- Unexpected router configuration changes
- DNS settings modifications
- Port scanning targeting router management interfaces
SIEM Query:
source="router_logs" AND (uri="/cgi-bin/ExportAllSettings.sh" OR event="configuration_export")