CVE-2017-7317
📋 TL;DR
CVE-2017-7317 allows attackers to extract root credentials from backup files on Humax Digital HG100 routers. This affects all users of HG100 firmware version 2.0.6. Attackers can gain complete control of the device with administrative privileges.
💻 Affected Systems
- Humax Digital HG100
📦 What is this software?
Hg100r Firmware by Humaxdigital
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing traffic interception, network pivoting, persistent backdoor installation, and credential theft from connected devices.
Likely Case
Unauthorized administrative access to router configuration, DNS hijacking, network monitoring, and potential compromise of connected devices.
If Mitigated
Limited impact if backup files are properly secured and access controls prevent unauthorized file retrieval.
🎯 Exploit Status
Exploitation requires access to the backup file (GatewaySettings.bin) which may be accessible via web interface or file disclosure vulnerabilities.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
No official patch available. Check vendor website for firmware updates or consider replacing affected devices.
🔧 Temporary Workarounds
Secure Backup File Access
linuxRestrict access to backup files and ensure they are not stored with sensitive credentials
chmod 600 GatewaySettings.bin
rm -f GatewaySettings.bin
Change Default Credentials
linuxChange root and administrative passwords immediately
passwd root
🧯 If You Can't Patch
- Isolate affected routers in separate network segments
- Implement strict network monitoring for suspicious access to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check if GatewaySettings.bin file exists and contains plaintext credentials using: strings GatewaySettings.bin | grep -i passwordCheck Version:
cat /etc/version or check web interface for firmware versionVerify Fix Applied:
Verify backup files no longer contain plaintext credentials and are properly secured📡 Detection & Monitoring
Log Indicators:
- Unauthorized access to backup files
- Multiple failed login attempts followed by successful root login
- Configuration changes from unknown IP addresses
Network Indicators:
- Unusual traffic patterns from router
- DNS configuration changes
- Port scanning originating from router
SIEM Query:
source="router_logs" AND (event="file_access" AND file="GatewaySettings.bin") OR (event="auth" AND user="root" AND result="success")