CVE-2024-39288
📋 TL;DR
This vulnerability allows authenticated attackers to execute arbitrary code on Wavlink AC3000 routers by sending a specially crafted HTTP request that triggers a stack-based buffer overflow. Attackers could potentially gain full control of affected devices. 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 botnet recruitment.
Likely Case
Router takeover allowing network traffic monitoring, DNS hijacking, credential theft, and use as pivot point for internal attacks.
If Mitigated
Limited impact due to network segmentation, strong authentication requirements, and restricted administrative access.
🎯 Exploit Status
Requires authentication but default credentials are often unchanged. Buffer overflow exploitation requires specific knowledge.
🛠️ 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. 3. Log into router admin interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Remote Administration
allPrevent external access to router web interface
Change Default Credentials
allUse strong, unique admin password
🧯 If You Can't Patch
- Segment affected routers on isolated network VLAN
- Implement strict firewall rules to limit administrative access to trusted IPs only
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or Firmware Update sectionCheck Version:
Not applicable - check via web interfaceVerify Fix Applied:
Verify firmware version is newer than M33A8.V5030.210505📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts followed by successful login and unusual HTTP POST requests to internet.cgi
Network Indicators:
- Unusual outbound connections from router, unexpected DNS queries, traffic spikes from router
SIEM Query:
source="router_logs" AND (url="*internet.cgi*" AND method="POST" AND size>threshold)