CVE-2020-25195
📋 TL;DR
This vulnerability allows attackers to bypass client-side input validation on Host Engineering ECOM100 modules, potentially causing device crashes through specially crafted web requests. It affects industrial control systems using H0-ECOM100, H2-ECOM100, and H4-ECOM100 communication modules. The lack of server-side validation makes exploitation straightforward.
💻 Affected Systems
- Host Engineering H0-ECOM100
- Host Engineering H2-ECOM100
- Host Engineering H4-ECOM100
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete denial of service causing industrial process disruption, potentially leading to safety incidents or production downtime in critical infrastructure environments.
Likely Case
Device crash requiring manual reboot, causing temporary communication loss between PLCs and control systems.
If Mitigated
Minimal impact if devices are behind firewalls with restricted web access and proper network segmentation.
🎯 Exploit Status
The advisory suggests exploitation is straightforward due to lack of server-side validation. No public exploit code was found in the references, but the simple nature makes weaponization likely.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware update as specified in ICSA-20-345-02
Vendor Advisory: https://us-cert.cisa.gov/ics/advisories/icsa-20-345-02
Restart Required: Yes
Instructions:
1. Download firmware update from Host Engineering website. 2. Access device web interface. 3. Navigate to firmware update section. 4. Upload new firmware file. 5. Wait for update to complete. 6. Reboot device as prompted.
🔧 Temporary Workarounds
Network Segmentation
allIsolate ECOM100 modules in separate VLANs with restricted access to configuration web interface
Access Control Lists
allImplement firewall rules to restrict web interface access to authorized management stations only
🧯 If You Can't Patch
- Disable web interface if not required for operations
- Implement network monitoring for abnormal HTTP requests to device web ports
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface and compare against patched versions in ICSA-20-345-02Check Version:
Access device web interface at http://[device-ip] and navigate to system information pageVerify Fix Applied:
Verify firmware version shows updated version after patch installation📡 Detection & Monitoring
Log Indicators:
- Multiple connection attempts to web interface
- Device reboot logs without scheduled maintenance
Network Indicators:
- Unusual HTTP POST requests to device web ports (typically 80/443)
- Traffic patterns suggesting buffer overflow attempts
SIEM Query:
source_ip="*" AND dest_port=80 AND http_method=POST AND uri_contains="config" AND bytes_sent>1000