CVE-2024-51406
📋 TL;DR
CVE-2024-51406 is an authentication bypass vulnerability in Floodlight SDN OpenFlow Controller v1.2 where local hosts can craft fake LLDP packets to manipulate network topology discovery. This allows attackers to hide specific clusters from the controller, causing missed hosts both inside and outside those clusters. Organizations using Floodlight v1.2 for software-defined networking are affected.
💻 Affected Systems
- Floodlight SDN OpenFlow Controller
📦 What is this software?
Open Sdn Controller by Projectfloodlight
⚠️ Risk & Real-World Impact
Worst Case
Attackers could create persistent blind spots in network visibility, enabling undetected lateral movement, data exfiltration, or man-in-the-middle attacks across the SDN infrastructure.
Likely Case
Network topology manipulation leading to incorrect traffic routing, service disruption, and potential bypass of network segmentation controls.
If Mitigated
Limited to isolated network segments with proper access controls, reducing the attack surface and preventing exploitation from unauthorized hosts.
🎯 Exploit Status
Exploitation requires local network access and knowledge of LLDP packet crafting. The vulnerability is documented in academic research and GitHub issues.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://github.com/floodlight/floodlight/issues/870
Restart Required: No
Instructions:
1. Monitor the Floodlight GitHub repository for security updates. 2. Consider upgrading to a newer version if available. 3. Apply workarounds until an official patch is released.
🔧 Temporary Workarounds
Restrict LLDP Packet Sources
linuxConfigure network switches to only accept LLDP packets from authorized sources and block crafted packets from untrusted hosts.
# Example on Linux with iptables: iptables -A INPUT -p LLDP -s ! <trusted_hosts> -j DROP
Implement Network Segmentation
allIsolate Floodlight controller management interface from general network traffic using VLANs or firewalls.
# Configure switch VLANs to separate management traffic
🧯 If You Can't Patch
- Implement strict network access controls to limit which hosts can communicate with the Floodlight controller's management interface.
- Deploy network monitoring and intrusion detection systems to detect anomalous LLDP traffic patterns.
🔍 How to Verify
Check if Vulnerable:
Check Floodlight version: if running v1.2 and using LLDP for topology discovery, the system is vulnerable.Check Version:
java -jar floodlight.jar --versionVerify Fix Applied:
Verify that LLDP packets from unauthorized sources are blocked and that network topology is correctly discovered.📡 Detection & Monitoring
Log Indicators:
- Unusual LLDP packet sources in Floodlight logs
- Missing or inconsistent network topology entries
Network Indicators:
- LLDP packets from unexpected MAC addresses
- Abnormal LLDP traffic patterns
SIEM Query:
source="floodlight.log" AND ("LLDP" OR "topology") AND ("unexpected" OR "missing")