CVE-2021-27480
📋 TL;DR
Delta Industrial Automation COMMGR versions 1.12 and prior contain a stack-based buffer overflow vulnerability that allows remote attackers to execute arbitrary code on affected systems. This affects industrial control systems using Delta's communication management software. Attackers can potentially take full control of vulnerable systems.
💻 Affected Systems
- Delta Industrial Automation COMMGR
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary code, disrupt industrial operations, manipulate control systems, and potentially cause physical damage or safety incidents.
Likely Case
Remote code execution leading to system compromise, data theft, lateral movement within industrial networks, and disruption of industrial processes.
If Mitigated
Limited impact if systems are isolated from untrusted networks, with proper segmentation and access controls preventing exploitation.
🎯 Exploit Status
Stack-based buffer overflow typically requires minimal exploitation complexity, especially with public advisory details available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.13 or later
Vendor Advisory: https://www.deltaww.com/en-US/Services/DownloadCenter/Detail/COMMGR
Restart Required: Yes
Instructions:
1. Download COMMGR version 1.13 or later from Delta's official website. 2. Backup current configuration. 3. Install the updated version. 4. Restart the system. 5. Verify the update was successful.
🔧 Temporary Workarounds
Network Segmentation
allIsolate COMMGR systems from untrusted networks and implement strict firewall rules
Access Control
allImplement strict network access controls and authentication requirements
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems from untrusted networks
- Deploy intrusion detection/prevention systems to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check COMMGR version in the software interface or installation directory. Versions 1.12 and below are vulnerable.Check Version:
Check the software interface or look for version information in the installation directory (typically C:\Program Files\Delta Industrial Automation\COMMGR)Verify Fix Applied:
Verify installed version is 1.13 or higher through the software interface or version file.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation
- Abnormal network connections from COMMGR process
- Buffer overflow error messages in application logs
Network Indicators:
- Unusual traffic patterns to COMMGR ports
- Malformed packets targeting COMMGR services
SIEM Query:
source="COMMGR" AND (event_type="buffer_overflow" OR process_name="cmd.exe" OR process_name="powershell.exe")