CVE-2018-20512
📋 TL;DR
This vulnerability allows attackers to bypass authentication and gain administrative privileges on EPON CPE-WiFi devices by sending specially crafted cookies. It affects EPON CPE-WiFi devices running version 2.0.4-X000. Network administrators using these devices are at risk of unauthorized access.
💻 Affected Systems
- EPON CPE-WiFi devices
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the network device, allowing attackers to reconfigure network settings, intercept traffic, or use the device as a pivot point for further attacks.
Likely Case
Unauthorized administrative access to the device, enabling configuration changes, service disruption, or credential harvesting.
If Mitigated
Limited impact if devices are behind firewalls with strict access controls and network segmentation.
🎯 Exploit Status
Exploitation requires sending specific cookie values to the web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
Check vendor website for firmware updates. If available, download and apply the latest firmware through the device's web interface.
🔧 Temporary Workarounds
Restrict network access
allLimit access to the device's management interface to trusted IP addresses only.
Disable remote management
allTurn off remote management features if not required.
🧯 If You Can't Patch
- Isolate vulnerable devices in a separate VLAN with strict firewall rules.
- Implement network monitoring for unusual authentication attempts or configuration changes.
🔍 How to Verify
Check if Vulnerable:
Attempt to access the device's web interface with cookies: cooLogin=1, cooUser=admin, timestamp=-1. If successful without credentials, device is vulnerable.Check Version:
Check firmware version in device web interface under System or Status section.Verify Fix Applied:
Test the same cookie-based authentication bypass after applying any updates or workarounds.📡 Detection & Monitoring
Log Indicators:
- Unusual authentication attempts with cookie parameters
- Configuration changes from unexpected sources
Network Indicators:
- HTTP requests containing cooLogin=1, cooUser=admin, timestamp=-1 parameters
SIEM Query:
http.cookie contains "cooLogin=1" AND http.cookie contains "cooUser=admin"