CVE-2024-39604
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on Wavlink AC3000 routers by sending specially crafted HTTP requests. Attackers can exploit this via man-in-the-middle attacks to 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 allowing attackers to install persistent malware, intercept all network traffic, pivot to internal networks, and use the device for botnet activities.
Likely Case
Attackers gain shell access to the router, enabling them to modify DNS settings, intercept credentials, and deploy additional payloads to connected devices.
If Mitigated
Limited impact if network segmentation isolates the router and HTTPS/TLS inspection prevents man-in-the-middle attacks.
🎯 Exploit Status
Exploitation requires man-in-the-middle position but no authentication. The CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component) suggests injection vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Check Wavlink support for firmware updates. 2. If update available, download from official source. 3. Upload via router admin interface. 4. Reboot router after update.
🔧 Temporary Workarounds
Disable URL filtering feature
linuxRemove or disable the vulnerable update_filter_url.sh functionality
ssh admin@router-ip 'rm /path/to/update_filter_url.sh'
ssh admin@router-ip 'chmod 000 /path/to/update_filter_url.sh'
Network segmentation
allIsolate router management interface from untrusted networks
🧯 If You Can't Patch
- Replace affected routers with patched or different models
- Implement strict network monitoring and IDS/IPS rules to detect exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface or via SSH: cat /etc/version | grep M33A8.V5030.210505Check Version:
cat /etc/versionVerify Fix Applied:
Verify firmware version is newer than M33A8.V5030.210505 and test if update_filter_url.sh script is no longer present or has been patched📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to router management interface
- Suspicious command execution in system logs
- Unexpected process creation from web services
Network Indicators:
- HTTP traffic to router on unusual ports
- Man-in-the-middle activity between router and update servers
- Unencrypted management traffic interception
SIEM Query:
source="router.log" AND ("update_filter_url" OR "command injection" OR "shell_exec")