CVE-2023-0897
📋 TL;DR
Sielco PolyEco1000 devices have a session hijack vulnerability where attackers can brute-force session cookies and intercept unencrypted sessions. This allows unauthorized access to industrial control systems. Organizations using PolyEco1000 devices without proper network segmentation are affected.
💻 Affected Systems
- Sielco PolyEco1000
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of industrial control system allowing attackers to manipulate processes, cause physical damage, or disrupt operations.
Likely Case
Unauthorized access to device configuration and monitoring interfaces leading to data theft or minor operational disruption.
If Mitigated
Limited impact due to network segmentation and proper access controls preventing lateral movement.
🎯 Exploit Status
Attack requires only network access and basic tools for cookie brute-forcing and session sniffing.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor for latest firmware
Vendor Advisory: https://www.cisa.gov/news-events/ics-advisories/icsa-23-299-07
Restart Required: Yes
Instructions:
1. Contact Sielco for latest firmware. 2. Backup configuration. 3. Apply firmware update. 4. Restart device. 5. Verify SSL/TLS is enabled.
🔧 Temporary Workarounds
Network Segmentation
allIsolate PolyEco1000 devices in separate VLAN with strict firewall rules.
SSL/TLS Enforcement
allDeploy reverse proxy with SSL termination and enforce HTTPS-only access.
🧯 If You Can't Patch
- Implement strict network access controls allowing only authorized IPs
- Monitor for unusual session activity and brute-force attempts
🔍 How to Verify
Check if Vulnerable:
Check if device uses HTTP instead of HTTPS and if session cookies are predictable or transmitted in cleartext.Check Version:
Check device web interface or contact vendor for firmware version.Verify Fix Applied:
Confirm HTTPS is enforced, session cookies are secure/randomized, and cannot be brute-forced.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts
- Session ID anomalies
- Access from unusual IPs
Network Indicators:
- HTTP traffic to PolyEco1000 instead of HTTPS
- Brute-force patterns on session endpoints
SIEM Query:
source="polyeco1000" AND (event_type="auth_failure" OR protocol="HTTP")