CVE-2024-39770
📋 TL;DR
This vulnerability allows authenticated attackers to execute arbitrary code on Wavlink AC3000 routers by sending specially crafted HTTP requests that trigger buffer overflows in the QoS configuration functionality. Attackers could gain full control of affected devices, potentially compromising network security. Only users of specific Wavlink router models with vulnerable firmware are affected.
💻 Affected Systems
- Wavlink AC3000
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to other devices, and potential data exfiltration.
Likely Case
Router takeover allowing network traffic monitoring, DNS hijacking, credential theft, and use as pivot point for attacking other internal systems.
If Mitigated
Limited impact if proper network segmentation, authentication controls, and monitoring are in place to detect and block exploitation attempts.
🎯 Exploit Status
Requires authentication but buffer overflow exploitation is well-understood. The Talos report provides technical details that could facilitate exploit development.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Wavlink website for firmware updates
2. Download latest firmware for AC3000
3. Access router web interface
4. Navigate to firmware update section
5. Upload and apply new firmware
6. Reboot router after update
🔧 Temporary Workarounds
Disable QoS functionality
allDisable Quality of Service feature to prevent access to vulnerable code path
Change default credentials
allEnsure strong, unique passwords are set for router administration
🧯 If You Can't Patch
- Segment router management interface to internal network only
- Implement network monitoring for unusual HTTP requests to router web interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface under System Status or About pageCheck Version:
curl -s http://router-ip/cgi-bin/internet.cgi | grep -i versionVerify Fix Applied:
Verify firmware version is newer than M33A8.V5030.210505📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to /cgi-bin/internet.cgi with en_enable parameter
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- HTTP traffic to router web interface containing unusually long en_enable parameter values
- Outbound connections from router to unexpected destinations
SIEM Query:
source="router-logs" AND (url="/cgi-bin/internet.cgi" AND method="POST" AND param="en_enable")