CVE-2018-11424
📋 TL;DR
This vulnerability allows memory corruption in the web interface of Moxa OnCell G3470A-LTE Series devices. Attackers could potentially execute arbitrary code or cause denial of service by exploiting this flaw. Organizations using affected versions of these industrial cellular gateways are at risk.
💻 Affected Systems
- Moxa OnCell G3470A-LTE Series
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, lateral movement into industrial networks, or persistent backdoor installation.
Likely Case
Denial of service causing device reboot or malfunction, potentially disrupting industrial operations.
If Mitigated
Limited impact with proper network segmentation and access controls preventing exploitation attempts.
🎯 Exploit Status
Memory corruption vulnerabilities in web interfaces are often easily exploitable with publicly available tools.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.6 Build 18041014 or later
Vendor Advisory: https://www.moxa.com/en/support/product-support/security-advisory/oncell-g3470a-lte-series-web-server-memory-corruption-vulnerability
Restart Required: Yes
Instructions:
1. Download latest firmware from Moxa support portal. 2. Backup device configuration. 3. Upload firmware via web interface. 4. Apply firmware update. 5. Reboot device. 6. Restore configuration if needed.
🔧 Temporary Workarounds
Disable Web Interface
allDisable the vulnerable web interface if remote management is not required.
Access device CLI via serial/SSH
Disable HTTP/HTTPS services in configuration
Network Segmentation
allIsolate devices in separate VLAN with strict firewall rules.
Configure firewall to block external access to port 80/443
Implement VLAN segmentation
🧯 If You Can't Patch
- Implement strict network access controls allowing only trusted IPs to access web interface
- Deploy network-based intrusion detection to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface at System > System Information or via CLI command 'show version'Check Version:
show versionVerify Fix Applied:
Verify firmware version is 1.6 Build 18041014 or later after update📡 Detection & Monitoring
Log Indicators:
- Multiple failed HTTP requests
- Unusual memory allocation patterns
- Device reboot logs
Network Indicators:
- Unusual HTTP traffic to device web interface
- Malformed HTTP requests
SIEM Query:
source="moxa-device" AND (event="memory_error" OR event="http_exploit_attempt")