CVE-2023-4487
📋 TL;DR
This vulnerability in GE CIMPLICITY 2023 allows a local attacker to insert malicious configuration files into the web server execution path, leading to privilege escalation and full control of the HMI software. It affects users of GE CIMPLICITY 2023 who have not applied the security patch.
💻 Affected Systems
- GE CIMPLICITY
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full compromise of the HMI system allowing an attacker to manipulate industrial processes, disrupt operations, or cause physical damage.
Likely Case
Local privilege escalation leading to unauthorized access to sensitive HMI functions and potential lateral movement within the control network.
If Mitigated
Limited impact with proper access controls and monitoring, though the vulnerability remains present.
🎯 Exploit Status
Exploitation requires local access to the system. The attacker needs to place malicious files in specific directories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: GE recommends updating to the latest version as per their advisory
Vendor Advisory: https://digitalsupport.ge.com/s/article/GE-Digital-CIMPLICITY-Privilege-Escalation-Vulnerability
Restart Required: Yes
Instructions:
1. Download the latest patch from GE Digital Support. 2. Backup current configuration. 3. Apply the patch following GE's installation instructions. 4. Restart the system. 5. Verify the update was successful.
🔧 Temporary Workarounds
Restrict File Permissions
windowsLimit write access to the web server execution path directories to prevent malicious file insertion.
icacls "C:\Program Files\GE\CIMPLICITY\webpath" /deny Users:(W)
icacls "C:\Program Files\GE\CIMPLICITY\webpath" /grant Administrators:(F)
Enable File Integrity Monitoring
allMonitor changes to configuration files in the web server path to detect unauthorized modifications.
🧯 If You Can't Patch
- Implement strict access controls to limit local user privileges on affected systems.
- Isolate affected systems from critical network segments and monitor for suspicious file activity.
🔍 How to Verify
Check if Vulnerable:
Check if running GE CIMPLICITY 2023 version without the latest security patches from GE.Check Version:
Check the software version through GE CIMPLICITY's About dialog or installed programs list in Windows.Verify Fix Applied:
Verify the software version matches the patched version specified in GE's advisory and test that unauthorized file writes to the web path are blocked.📡 Detection & Monitoring
Log Indicators:
- Unauthorized file creation/modification in CIMPLICITY web server directories
- Unexpected process execution from web server path
Network Indicators:
- Unusual network traffic from the HMI system indicating compromise
SIEM Query:
EventID=4663 OR EventID=4656 AND ObjectName LIKE '%CIMPLICITY%webpath%' AND AccessMask=0x2🔗 References
- https://digitalsupport.ge.com/s/article/GE-Digital-CIMPLICITY-Privilege-Escalation-Vulnerability
- https://www.cisa.gov/news-events/ics-advisories/icsa-23-243-02
- https://digitalsupport.ge.com/s/article/GE-Digital-CIMPLICITY-Privilege-Escalation-Vulnerability
- https://www.cisa.gov/news-events/ics-advisories/icsa-23-243-02
