CVE-2024-41595
📋 TL;DR
DrayTek Vigor310 devices through firmware version 4.3.2.6 contain buffer overflow vulnerabilities in .cgi pages due to missing bounds checks. This allows remote attackers to change device settings or cause denial of service. Organizations using affected DrayTek Vigor310 devices are vulnerable.
💻 Affected Systems
- DrayTek Vigor310
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistent backdoor installation, and lateral movement into internal networks.
Likely Case
Device settings modification causing service disruption, configuration changes, or denial of service through device crashes.
If Mitigated
Limited to denial of service if proper network segmentation and access controls prevent exploitation attempts.
🎯 Exploit Status
Research reports demonstrate exploitation techniques. The vulnerability requires sending crafted requests to .cgi endpoints.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check DrayTek for firmware updates beyond 4.3.2.6
Vendor Advisory: https://www.draytek.com/support/security-advisory/
Restart Required: Yes
Instructions:
1. Log into DrayTek Vigor310 web interface. 2. Navigate to System Maintenance > Firmware Upgrade. 3. Download latest firmware from DrayTek support site. 4. Upload and apply firmware update. 5. Reboot device after update completes.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict access to device management interface using firewall rules
Disable Remote Management
allDisable WAN-side management access if not required
🧯 If You Can't Patch
- Isolate affected devices in separate network segments with strict firewall rules
- Implement network monitoring for unusual traffic patterns to .cgi endpoints
🔍 How to Verify
Check if Vulnerable:
Check firmware version in web interface under System Status > Firmware InformationCheck Version:
Not applicable - check via web interface or SSH if enabledVerify Fix Applied:
Verify firmware version is updated beyond 4.3.2.6 and test .cgi endpoints with controlled payloads📡 Detection & Monitoring
Log Indicators:
- Multiple failed requests to .cgi pages
- Unusual POST requests with large payloads to device management interface
Network Indicators:
- Unusual traffic patterns to device management ports (typically 80/443)
- Requests to .cgi endpoints with abnormal parameters
SIEM Query:
source_ip="device_ip" AND (uri="*.cgi" OR user_agent="*exploit*" OR http_method="POST" AND content_length>threshold)