CVE-2020-26867
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on ARC Informatique PcVue web and mobile back-end servers by exploiting insecure deserialization of untrusted data. Organizations using PcVue versions prior to 12.0.17 for industrial control system (ICS) and SCADA operations are affected. The vulnerability enables complete system compromise.
💻 Affected Systems
- ARC Informatique PcVue
📦 What is this software?
Pcvue by Pcvuesolutions
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of industrial control systems leading to operational disruption, safety incidents, data theft, and potential physical damage to critical infrastructure.
Likely Case
Unauthorized remote code execution allowing attackers to gain persistent access, manipulate industrial processes, steal sensitive data, and move laterally within OT networks.
If Mitigated
Limited impact if proper network segmentation, access controls, and monitoring are implemented, though the vulnerability still presents significant risk.
🎯 Exploit Status
The vulnerability involves deserialization of untrusted data, which is a well-known attack vector with established exploitation techniques. While no public PoC is documented, the nature of the vulnerability makes exploitation straightforward for skilled attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 12.0.17
Vendor Advisory: https://www.pcvuesolutions.com/support/index.php/en/security-bulletin/1076-security-bulletin-2020-1
Restart Required: Yes
Instructions:
1. Download PcVue version 12.0.17 or later from the vendor portal. 2. Backup current configuration and data. 3. Install the updated version following vendor installation procedures. 4. Restart all PcVue services and verify functionality.
🔧 Temporary Workarounds
Network Segmentation
allIsolate PcVue systems from untrusted networks and implement strict firewall rules to limit access to necessary IPs only.
Application Whitelisting
windowsImplement application control policies to prevent execution of unauthorized code on PcVue servers.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate PcVue systems from internet and untrusted networks
- Deploy intrusion detection systems and monitor for anomalous deserialization attempts
🔍 How to Verify
Check if Vulnerable:
Check PcVue version in the application interface or installation directory. Versions below 12.0.17 are vulnerable.Check Version:
Check PcVue About dialog or installation properties. No single command; version is displayed in the application interface.Verify Fix Applied:
Verify that PcVue version is 12.0.17 or higher and test that web/mobile back-end functionality remains operational.📡 Detection & Monitoring
Log Indicators:
- Unusual deserialization errors in application logs
- Unexpected process creation from PcVue services
- Authentication attempts from unusual IP addresses
Network Indicators:
- Unusual network traffic to PcVue web/mobile back-end ports
- HTTP requests containing serialized objects to vulnerable endpoints
SIEM Query:
source="pcvue" AND (event_type="deserialization_error" OR process_name="powershell.exe" OR cmd.exe) FROM web_server🔗 References
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2020/10/09/klcert-20-015-remote-code-execution-in-arc-informatique-pcvue/
- https://us-cert.cisa.gov/ics/advisories/icsa-20-308-03
- https://us-cert.cisa.gov/ics/advisories/icsa-20-308-03
- https://www.pcvuesolutions.com/security
- https://www.pcvuesolutions.com/support/index.php/en/security-bulletin/1076-security-bulletin-2020-1
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2020/10/09/klcert-20-015-remote-code-execution-in-arc-informatique-pcvue/
- https://us-cert.cisa.gov/ics/advisories/icsa-20-308-03
- https://us-cert.cisa.gov/ics/advisories/icsa-20-308-03
- https://www.pcvuesolutions.com/security
- https://www.pcvuesolutions.com/support/index.php/en/security-bulletin/1076-security-bulletin-2020-1
