CVE-2024-51016
📋 TL;DR
Netgear XR300 routers running firmware v1.0.3.78 contain a stack buffer overflow vulnerability in the usb_approve.cgi component. Attackers can exploit this by sending specially crafted POST requests to cause a Denial of Service (DoS) by crashing the device. This affects all users of Netgear XR300 routers with the vulnerable firmware version.
💻 Affected Systems
- Netgear XR300
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device crash requiring physical power cycle, potentially leading to extended network downtime and disruption of all services running through the router.
Likely Case
Router becomes unresponsive, requiring reboot to restore functionality, causing temporary network outage for connected devices.
If Mitigated
If properly segmented and firewalled, impact limited to isolated network segment with minimal business disruption.
🎯 Exploit Status
Public GitHub repository contains proof-of-concept exploit code. Exploitation requires network access to the router's web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://www.netgear.com/about/security/
Restart Required: No
Instructions:
1. Check Netgear security advisory page for updates
2. Monitor for firmware updates
3. Apply any available patches immediately
🔧 Temporary Workarounds
Disable USB Sharing
allDisable USB sharing functionality to remove attack surface
Access router web interface > Advanced > USB Functions > Disable ReadySHARE
Restrict Web Interface Access
allLimit access to router administration interface
Access router web interface > Advanced > Administration > Set Management > Restrict access to specific IP addresses
🧯 If You Can't Patch
- Segment router to isolated network segment with strict firewall rules
- Implement network monitoring for suspicious POST requests to usb_approve.cgi
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface: Advanced > Administration > Router Status > Firmware VersionCheck Version:
curl -s http://router-ip/currentsetting.htm | grep FirmwareVerify Fix Applied:
Verify firmware version is newer than v1.0.3.78 or USB sharing is disabled📡 Detection & Monitoring
Log Indicators:
- Router crash/reboot events
- Multiple POST requests to /usb_approve.cgi
- Unusual traffic patterns to router management interface
Network Indicators:
- HTTP POST requests containing 'addName%d' parameter with long strings
- Traffic to router IP on port 80/443 with abnormal payload sizes
SIEM Query:
source="router_logs" AND (uri="/usb_approve.cgi" OR message="crash" OR message="reboot")