CVE-2024-39782
📋 TL;DR
This CVE describes multiple OS command injection vulnerabilities in the Wavlink AC3000 router's web interface. Authenticated attackers can execute arbitrary commands on the device by sending specially crafted HTTP requests to the adm.cgi endpoint. This affects users of Wavlink AC3000 routers with vulnerable firmware.
💻 Affected Systems
- Wavlink AC3000 M33A8
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise allowing attacker to install persistent backdoors, intercept network traffic, pivot to internal networks, or brick the device.
Likely Case
Attacker gains root shell access on the router, enabling traffic interception, credential theft, and lateral movement to connected devices.
If Mitigated
Limited impact if network segmentation isolates the router and strong authentication prevents unauthorized access.
🎯 Exploit Status
Exploit requires authentication but default credentials or credential brute-forcing may bypass this.
🛠️ 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
🔧 Temporary Workarounds
Disable web interface access
linuxBlock access to router web interface from untrusted networks
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Change default credentials
allUse strong, unique passwords for router admin access
🧯 If You Can't Patch
- Isolate router on separate VLAN with strict firewall rules
- Implement network monitoring for suspicious HTTP requests to adm.cgi
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System Status or About pageCheck Version:
curl -s http://router-ip/cgi-bin/adm.cgi | grep -i versionVerify Fix Applied:
Verify firmware version is newer than V5030.210505📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /cgi-bin/adm.cgi with restart_min parameter
- Unusual command execution in system logs
Network Indicators:
- HTTP traffic to router port 80/443 containing shell metacharacters in POST data
SIEM Query:
source="router_logs" AND uri_path="/cgi-bin/adm.cgi" AND http_method="POST" AND (form_data CONTAINS "restart_min=" OR form_data CONTAINS ";" OR form_data CONTAINS "|" OR form_data CONTAINS "`")