CVE-2020-27868
📋 TL;DR
CVE-2020-27868 is a critical remote code execution vulnerability in Qognify Ocularis video management software. Unauthenticated attackers can exploit insecure deserialization in the EventCoordinator endpoint to execute arbitrary code with SYSTEM privileges. All installations of Ocularis 5.9.0.395 are affected.
💻 Affected Systems
- Qognify Ocularis
📦 What is this software?
Ocularis by Qognify
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with SYSTEM privileges, allowing attackers to install malware, steal data, pivot to other systems, or disrupt operations.
Likely Case
Remote code execution leading to ransomware deployment, data exfiltration, or creation of persistent backdoors.
If Mitigated
Limited impact if network segmentation, strict firewall rules, and endpoint protection prevent exploitation attempts.
🎯 Exploit Status
ZDI published technical details and proof-of-concept. The vulnerability is easily exploitable without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.9.0.396 or later
Vendor Advisory: https://www.qognify.com/support-training/software-downloads/
Restart Required: Yes
Instructions:
1. Download the patched version from Qognify's support portal. 2. Backup current configuration and data. 3. Install the update following vendor instructions. 4. Restart the Ocularis service or server.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to Ocularis EventCoordinator endpoint (typically port 80/443) to trusted IP addresses only.
Use firewall rules to block external access to Ocularis ports
Application Firewall Rules
allBlock malicious serialized object patterns at the web application firewall level.
Configure WAF to block suspicious serialization payloads to /EventCoordinator endpoint
🧯 If You Can't Patch
- Isolate the Ocularis server in a dedicated VLAN with strict network access controls
- Implement intrusion detection/prevention systems to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check Ocularis version in administration interface or installation directory. Version 5.9.0.395 is vulnerable.Check Version:
Check Ocularis web interface → Help → About, or examine installation directory version filesVerify Fix Applied:
Verify version is 5.9.0.396 or later. Test that EventCoordinator endpoint rejects malicious serialized objects.📡 Detection & Monitoring
Log Indicators:
- Unusual requests to /EventCoordinator endpoint
- Serialization errors in application logs
- Unexpected process creation by Ocularis service
Network Indicators:
- Malformed serialized objects sent to Ocularis ports
- Unusual outbound connections from Ocularis server
SIEM Query:
source="ocularis.log" AND (uri="/EventCoordinator" OR message="*serialization*" OR message="*deserialization*")