CVE-2021-20623
📋 TL;DR
CVE-2021-20623 is a critical remote code execution vulnerability in Video Insight VMS that allows attackers to execute arbitrary code with system privileges by sending specially crafted requests. This affects Video Insight VMS versions prior to 7.8, potentially compromising entire video management systems and connected cameras.
💻 Affected Systems
- Video Insight VMS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attacker to execute arbitrary code as system user, potentially gaining persistent access, exfiltrating video feeds, and using the system as a pivot point to attack other network resources.
Likely Case
Remote code execution leading to system compromise, data theft, and potential ransomware deployment on vulnerable Video Insight VMS installations.
If Mitigated
Limited impact if system is isolated behind firewalls with strict network segmentation and access controls.
🎯 Exploit Status
The vulnerability requires sending specially crafted requests but does not require authentication, making exploitation straightforward for attackers with network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.8 and later
Vendor Advisory: http://downloadvi.com/downloads/IPServer/v7.8/780182/v780182RN.pdf
Restart Required: Yes
Instructions:
1. Download Video Insight VMS version 7.8 or later from official vendor sources. 2. Backup current configuration and data. 3. Install the update following vendor documentation. 4. Restart the Video Insight services or server as required.
🔧 Temporary Workarounds
Network Segmentation and Firewall Rules
allRestrict network access to Video Insight VMS to only trusted management networks and required client connections.
Disable Unnecessary Services
windowsDisable any unnecessary network services on the Video Insight server to reduce attack surface.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Video Insight VMS from untrusted networks
- Deploy intrusion detection/prevention systems with rules to detect exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check Video Insight VMS version in administration interface or via installed program information in Windows Control Panel.Check Version:
Check via Video Insight web interface or Windows Programs and Features for installed version.Verify Fix Applied:
Verify version is 7.8 or higher in Video Insight administration interface and test that the system functions normally after update.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation events, unexpected network connections from Video Insight service, authentication failures followed by successful access
Network Indicators:
- Unusual outbound connections from Video Insight server, unexpected HTTP requests to Video Insight management interface
SIEM Query:
source="VideoInsight" AND (event_type="process_creation" OR event_type="network_connection") AND dest_port!=80 AND dest_port!=443