CVE-2024-33603
📋 TL;DR
The LevelOne WBR-6012 router has an information disclosure vulnerability that allows unauthenticated users to access a verbose system log page containing sensitive data like memory addresses and IP addresses for login attempts. This could enable session hijacking since the device uses IP addresses for authentication. All users of the affected router model are potentially impacted.
💻 Affected Systems
- LevelOne WBR-6012 router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could hijack active sessions, gain unauthorized access to the router's administrative interface, and potentially pivot to internal networks.
Likely Case
Attackers gather reconnaissance data including internal IP addresses, login patterns, and system information to plan further attacks.
If Mitigated
Limited exposure of non-critical system information with no direct access to credentials or administrative functions.
🎯 Exploit Status
Exploitation requires only web browser access to the vulnerable endpoint. No authentication or special tools needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Check vendor website for firmware updates
2. If update available, download and install via web interface
3. Verify the /cgi-bin/log.cgi endpoint is no longer accessible without authentication
🔧 Temporary Workarounds
Block External Access to Web Interface
linuxConfigure firewall rules to block external access to the router's web management interface (typically port 80/443)
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disable Remote Management
allDisable remote management features in the router's web interface
🧯 If You Can't Patch
- Replace the router with a supported model from a different vendor
- Place router behind a firewall that blocks all inbound access to management interfaces
🔍 How to Verify
Check if Vulnerable:
Access http://[router-ip]/cgi-bin/log.cgi without authentication. If system logs are displayed, the device is vulnerable.Check Version:
Check router web interface status page or use vendor-specific CLI commands if availableVerify Fix Applied:
Attempt to access the /cgi-bin/log.cgi endpoint without authentication. Should receive authentication prompt or error.📡 Detection & Monitoring
Log Indicators:
- Multiple unauthenticated access attempts to /cgi-bin/log.cgi
- Unusual external IP addresses accessing router management interface
Network Indicators:
- External traffic to router management ports (80/443) from unknown sources
- HTTP GET requests to /cgi-bin/log.cgi
SIEM Query:
source="router_logs" AND (url="/cgi-bin/log.cgi" OR url="/cgi-bin/log.cgi") AND status="200" AND auth="none"