CVE-2022-40224
📋 TL;DR
This vulnerability allows remote attackers to cause denial of service in Moxa SDS-3008 industrial switches by sending specially crafted HTTP headers. Attackers can crash the web server functionality, disrupting network management access. Organizations using affected Moxa switches in industrial environments are at risk.
💻 Affected Systems
- Moxa SDS-3008 Series Industrial Ethernet Switch
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete web server crash requiring physical reset or reboot of the industrial switch, disrupting network management and potentially affecting industrial operations.
Likely Case
Temporary denial of service to the web management interface, requiring manual intervention to restore access.
If Mitigated
Minimal impact if switches are behind firewalls with restricted HTTP access and proper network segmentation.
🎯 Exploit Status
Attack requires network access to HTTP port but no authentication. Simple HTTP request with malicious header can trigger.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 2.2 or later
Vendor Advisory: https://www.moxa.com/en/support/product-support/security-advisory/sds-3008-series-multiple-web-vulnerabilities
Restart Required: Yes
Instructions:
1. Download firmware version 2.2 or later from Moxa support site. 2. Backup current configuration. 3. Upload new firmware via web interface or console. 4. Reboot switch. 5. Restore configuration if needed.
🔧 Temporary Workarounds
Restrict HTTP Access
allBlock external HTTP access to switch management interface using firewall rules
Disable Web Interface
allDisable HTTP/HTTPS web management and use console/SSH only
🧯 If You Can't Patch
- Implement strict network segmentation to isolate industrial switches from untrusted networks
- Deploy network monitoring to detect abnormal HTTP traffic patterns to switch management interfaces
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface (System > System Information) or console command 'show version'Check Version:
show versionVerify Fix Applied:
Confirm firmware version is 2.2 or higher and test HTTP connectivity remains stable📡 Detection & Monitoring
Log Indicators:
- Web server crash logs
- HTTP connection resets
- Abnormal HTTP header patterns
Network Indicators:
- Multiple HTTP requests with unusual header patterns to switch management IP on port 80/443
SIEM Query:
source_ip=* AND dest_port IN (80,443) AND dest_ip=[switch_ip] AND http_header CONTAINS [malicious_pattern]🔗 References
- https://talosintelligence.com/vulnerability_reports/TALOS-2022-1618
- https://www.moxa.com/en/support/product-support/security-advisory/sds-3008-series-multiple-web-vulnerabilities
- https://talosintelligence.com/vulnerability_reports/TALOS-2022-1618
- https://www.moxa.com/en/support/product-support/security-advisory/sds-3008-series-multiple-web-vulnerabilities
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2022-1618
