CVE-2023-4516
📋 TL;DR
A local attacker can change the update source in IGSS Update Service without authentication, potentially leading to remote code execution by forcing updates with malicious content. This affects systems running vulnerable versions of Schneider Electric's IGSS software. The vulnerability requires local access to the system.
💻 Affected Systems
- Schneider Electric IGSS (Interactive Graphical SCADA System)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with system-level privileges, allowing complete compromise of the industrial control system.
Likely Case
Unauthorized modification of update sources leading to installation of malicious software or denial of service.
If Mitigated
Limited impact with proper network segmentation and access controls preventing local attacker access.
🎯 Exploit Status
Exploitation requires local access but no authentication. The vulnerability is in the update service authentication mechanism.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: IGSS Version 16.0.0.23040 and later
Vendor Advisory: https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2023-255-01&p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2023-255-01.pdf
Restart Required: Yes
Instructions:
1. Download IGSS Version 16.0.0.23040 or later from Schneider Electric. 2. Stop IGSS services. 3. Install the update. 4. Restart services and verify functionality.
🔧 Temporary Workarounds
Restrict Local Access
allLimit local access to IGSS systems to authorized personnel only using network segmentation and access controls.
Disable Unnecessary Services
windowsDisable IGSS Update Service if automatic updates are not required in your environment.
sc stop "IGSS Update Service"
sc config "IGSS Update Service" start= disabled
🧯 If You Can't Patch
- Implement strict network segmentation to isolate IGSS systems from untrusted networks.
- Apply principle of least privilege and restrict local access to authorized personnel only.
🔍 How to Verify
Check if Vulnerable:
Check IGSS version in Control Panel > Programs and Features. Versions below 16.0.0.23040 are vulnerable.Check Version:
wmic product where name="IGSS" get versionVerify Fix Applied:
Verify installed version is 16.0.0.23040 or higher and that the IGSS Update Service is running with proper authentication.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to IGSS Update Service
- Unexpected update source changes in IGSS logs
Network Indicators:
- Unusual network traffic from IGSS systems to non-standard update servers
SIEM Query:
source="IGSS" AND (event_type="update_source_change" OR auth_failure="true")