CVE-2021-25910
📋 TL;DR
CVE-2021-25910 is an improper authentication vulnerability in ZIV AUTOMATION 4CCT-EA6-334126BF devices where the cookie parameter can be manipulated to bypass authentication. This allows local attackers to modify device parameters as if they were authenticated users. Organizations using these industrial control system devices are affected.
💻 Affected Systems
- ZIV AUTOMATION 4CCT-EA6-334126BF
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker could modify critical device parameters, potentially disrupting industrial processes, causing equipment damage, or creating safety hazards in operational technology environments.
Likely Case
Local attackers with network access could modify configuration settings, potentially disrupting device functionality or gaining persistent access to the system.
If Mitigated
With proper network segmentation and access controls, impact would be limited to isolated network segments with minimal operational disruption.
🎯 Exploit Status
Exploitation requires local network access and manipulation of cookie parameters. No public exploit code identified in references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified
Vendor Advisory: https://www.incibe-cert.es/en/early-warning/ics-advisories/4cct-vulnerable-improper-authentication
Restart Required: No
Instructions:
No official patch identified. Contact ZIV AUTOMATION for firmware updates or security guidance specific to this vulnerability.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected devices in dedicated network segments with strict access controls
Access Control Lists
allImplement firewall rules to restrict access to device management interfaces
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected devices from general network traffic
- Monitor network traffic to/from affected devices for unusual authentication attempts or parameter modifications
🔍 How to Verify
Check if Vulnerable:
Check if you have ZIV AUTOMATION 4CCT-EA6-334126BF devices deployed and review network access controlsCheck Version:
Check device firmware version through web interface or device documentationVerify Fix Applied:
Test authentication mechanisms by attempting to access device parameters without proper credentials📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts followed by successful parameter modifications
- Unusual cookie values in web interface logs
Network Indicators:
- Unauthorized parameter modification requests to device management interface
- Traffic to device from unexpected network segments
SIEM Query:
source_ip IN (device_network_range) AND (http_cookie CONTAINS 'manipulated' OR http_method = 'POST' AND uri CONTAINS 'parameter')