CVE-2024-40090
📋 TL;DR
The Vilo 5 Mesh WiFi System running firmware version 5.16.1.33 or earlier contains an information disclosure vulnerability in its Boa webserver. Remote, unauthenticated attackers can leak memory addresses from uClibc and the stack by sending a simple GET request to the index page. This affects all users of vulnerable Vilo 5 Mesh WiFi Systems.
💻 Affected Systems
- Vilo 5 Mesh WiFi System
📦 What is this software?
Vilo 5 Firmware by Viloliving
⚠️ Risk & Real-World Impact
Worst Case
Memory address leaks could enable attackers to bypass ASLR (Address Space Layout Randomization), facilitating more sophisticated attacks like remote code execution if combined with other vulnerabilities.
Likely Case
Attackers gain information about system memory layout, which could assist in developing further exploits but doesn't directly compromise system integrity or confidentiality.
If Mitigated
With proper network segmentation and firewall rules, the impact is limited to information gathering that doesn't lead to immediate system compromise.
🎯 Exploit Status
Exploitation requires only a simple HTTP GET request to the device's web interface. The GitHub reference contains technical details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: > 5.16.1.33
Vendor Advisory: http://vilo.com
Restart Required: Yes
Instructions:
1. Log into Vilo admin interface. 2. Navigate to firmware update section. 3. Check for and install any available updates. 4. Reboot the device after update completes.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Vilo devices from untrusted networks using firewall rules
Access Control
linuxRestrict web interface access to trusted IP addresses only
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Segment Vilo devices on isolated VLANs away from critical infrastructure
- Implement strict firewall rules blocking external access to Vilo web interface ports (typically 80/443)
🔍 How to Verify
Check if Vulnerable:
Send GET request to device IP address and check response for memory address patterns in headers or bodyCheck Version:
Check Vilo admin interface under System Information or SettingsVerify Fix Applied:
After update, verify firmware version > 5.16.1.33 and test that GET requests no longer leak memory addresses📡 Detection & Monitoring
Log Indicators:
- Multiple GET requests to root path from unusual sources
- Webserver error logs showing memory-related anomalies
Network Indicators:
- HTTP GET requests to device IP on port 80/443 from external addresses
- Unusual traffic patterns to mesh system web interface
SIEM Query:
sourceIP="Vilo_Device_IP" AND destPort=80 AND httpMethod=GET AND userAgent!="Browser_User_Agent"