CVE-2024-39358
📋 TL;DR
A buffer overflow vulnerability in the Wavlink AC3000 router's adm.cgi set_wzap() function allows authenticated attackers to execute arbitrary code via specially crafted HTTP requests. This affects Wavlink AC3000 M33A8.V5030.210505 firmware users. Attackers with network access to the router's admin interface can potentially gain full system control.
💻 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 connected devices, and botnet recruitment.
Likely Case
Remote code execution allowing attacker to modify router settings, intercept traffic, or use device as pivot point for internal network attacks.
If Mitigated
Limited impact if strong authentication, network segmentation, and proper access controls prevent unauthorized access to admin interface.
🎯 Exploit Status
Exploit requires authentication but is straightforward once credentials are obtained. Public PoC available in Talos report.
🛠️ 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. Log into router admin interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot router after update completes.
🔧 Temporary Workarounds
Disable Remote Admin Access
allPrevent external access to admin interface
Login to router admin → System → Remote Management → Disable
Change Default Credentials
allUse strong, unique admin password
Login to router admin → System → Password → Set strong password
🧯 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 admin interface under System → FirmwareCheck Version:
curl -s http://router-ip/cgi-bin/adm.cgi | grep versionVerify Fix Applied:
Verify firmware version is newer than M33A8.V5030.210505📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /cgi-bin/adm.cgi with set_wzap parameter
- Unusual admin login attempts
Network Indicators:
- HTTP traffic to router admin interface with large payloads
- Suspicious POST requests to adm.cgi
SIEM Query:
source="router-logs" AND uri="/cgi-bin/adm.cgi" AND method="POST" AND params CONTAINS "set_wzap"