CVE-2024-6144
📋 TL;DR
This vulnerability allows network-adjacent attackers to execute arbitrary code on Actiontec WCB6200Q routers without authentication. The flaw exists in the HTTP server's handling of multipart boundaries, where improper length validation leads to stack-based buffer overflow. Attackers can exploit this to gain control of the router's HTTP server process.
💻 Affected Systems
- Actiontec WCB6200Q
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing persistent backdoor installation, network traffic interception, lateral movement to connected devices, and router bricking.
Likely Case
Router compromise leading to network traffic monitoring, DNS hijacking, credential theft from connected devices, and denial of service.
If Mitigated
Limited impact with proper network segmentation and monitoring, potentially only affecting the router's HTTP service availability.
🎯 Exploit Status
Exploitation requires network adjacency but no authentication. The vulnerability is well-documented in ZDI advisory with technical details that could facilitate exploit development.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor for latest firmware
Vendor Advisory: https://www.actiontec.com/support/security-advisories/
Restart Required: Yes
Instructions:
1. Log into router admin interface. 2. Navigate to firmware update section. 3. Download latest firmware from Actiontec support site. 4. Upload and apply firmware update. 5. Reboot router after update completes.
🔧 Temporary Workarounds
Disable HTTP Management Interface
allDisable the vulnerable HTTP server if not required for management
Router-specific: Access admin interface > Advanced Settings > Remote Management > Disable HTTP
Network Segmentation
allIsolate router on separate VLAN to limit attack surface
Switch configuration: vlan 99
interface vlan 99
ip address 192.168.99.1 255.255.255.0
🧯 If You Can't Patch
- Implement strict network access controls to limit access to router management interface
- Deploy network-based intrusion detection to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version against vendor advisory. Test with controlled exploit if authorized.Check Version:
Router-specific: Access admin interface > Status > Firmware VersionVerify Fix Applied:
Verify firmware version matches patched version from vendor. Test with vulnerability scanner if available.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests with multipart boundaries
- HTTP server crash/restart logs
- Unusual outbound connections from router
Network Indicators:
- HTTP requests with crafted multipart boundaries to router port 80
- Unusual traffic patterns from router to external IPs
SIEM Query:
source="router.logs" AND (http_request CONTAINS "multipart" OR http_status=500)