CVE-2023-31808
📋 TL;DR
Technicolor TG670 10.5.N.9 devices contain hard-coded administrative credentials that allow remote attackers to gain full control over the device when Remote Administration is enabled. This affects all users of these specific router models with vulnerable firmware versions.
💻 Affected Systems
- Technicolor TG670
📦 What is this software?
Tg670 Firmware by Technicolor
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover allowing network traffic interception, DNS hijacking, malware deployment, and use as attack platform
Likely Case
Unauthorized administrative access leading to network configuration changes, credential theft, and persistent backdoor installation
If Mitigated
Limited impact if Remote Administration is disabled and device is behind firewall
🎯 Exploit Status
Simple credential-based authentication bypass using known hard-coded passwords
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://www.kb.cert.org/vuls/id/913565
Restart Required: No
Instructions:
No official patch available. Follow workarounds and mitigation steps.
🔧 Temporary Workarounds
Disable Remote Administration
allTurn off WAN-side administrative access in router settings
Access router admin panel > Security/Administration > Disable 'Remote Administration' or 'Remote Management'
Change Default Credentials
allChange all administrative passwords including hidden accounts
Access router admin panel > Administration/System > Change all password fields
🧯 If You Can't Patch
- Isolate device in separate VLAN with strict firewall rules
- Monitor for suspicious administrative login attempts and configuration changes
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin panel under System/Status. If version is 10.5.N.9, device is vulnerable.Check Version:
Check via web interface: System > Status > Firmware VersionVerify Fix Applied:
Verify Remote Administration is disabled and attempt to access admin interface from external network (should fail)📡 Detection & Monitoring
Log Indicators:
- Successful admin logins from unexpected IP addresses
- Configuration changes from unknown sources
- Multiple failed login attempts followed by success
Network Indicators:
- Administrative port (typically 80/443/8080) traffic from external IPs
- Unusual outbound connections from router
SIEM Query:
source_ip=EXTERNAL AND (dest_port=80 OR dest_port=443 OR dest_port=8080) AND device_type="router" AND action="admin_login"