CVE-2019-6522
📋 TL;DR
This vulnerability in Moxa IKS and EDS industrial switches allows attackers to read arbitrary device memory due to improper array bounds checking. Attackers can potentially retrieve sensitive data or cause device reboots, affecting organizations using these industrial networking devices.
💻 Affected Systems
- Moxa IKS-G6824A Series
- Moxa EDS-405A Series
- Moxa EDS-408A Series
- Moxa EDS-510A Series
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing data exfiltration, denial of service, and potential lateral movement within industrial control systems.
Likely Case
Sensitive data leakage and device instability leading to operational disruption in industrial environments.
If Mitigated
Limited impact if devices are isolated and have proper network segmentation.
🎯 Exploit Status
Exploitation requires network access to device but no authentication. Memory reading requires specific knowledge of device architecture.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware version 3.8
Vendor Advisory: https://www.moxa.com/en/support/product-support/security-advisory/moxa-iks-and-eds-series-industrial-ethernet-switches-vulnerabilities
Restart Required: Yes
Instructions:
1. Download firmware version 3.8 from Moxa website. 2. Backup current configuration. 3. Upload new firmware via web interface or CLI. 4. Reboot device. 5. Restore configuration if needed.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected devices in separate VLANs with strict firewall rules.
Access Control Lists
allImplement ACLs to restrict access to device management interfaces.
access-list 100 deny ip any host <device_ip>
access-list 100 permit ip any any
🧯 If You Can't Patch
- Implement strict network segmentation to isolate devices from untrusted networks
- Monitor network traffic to/from affected devices for unusual patterns
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface (System > System Information) or CLI command 'show version'Check Version:
show versionVerify Fix Applied:
Verify firmware version is 3.8 or later using same methods as checking vulnerability📡 Detection & Monitoring
Log Indicators:
- Multiple failed memory access attempts
- Unexpected device reboots
- Unusual memory read patterns
Network Indicators:
- Unusual traffic to device management ports (80, 443, 23)
- Memory read requests to unusual addresses
SIEM Query:
source_ip=* AND dest_ip=<device_ip> AND (port=80 OR port=443 OR port=23) AND bytes_transferred>threshold