CVE-2023-5402
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on affected Schneider Electric systems by exploiting improper privilege management in the transfer command over the network. It affects Schneider Electric products with vulnerable versions exposed to network access. Attackers can gain full system control without authentication.
💻 Affected Systems
- Schneider Electric products with vulnerable transfer command functionality
📦 What is this software?
C Bus Toolkit by Schneider Electric
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise leading to data theft, ransomware deployment, or disruption of industrial operations
Likely Case
Remote code execution allowing attacker to install malware, pivot to other systems, or disrupt operations
If Mitigated
Limited impact if systems are isolated, patched, or have network access restricted
🎯 Exploit Status
CVSS 9.8 suggests low attack complexity; network access to vulnerable service required
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific fixed versions
Vendor Advisory: https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2023-283-01&p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2023-283-01.pdf
Restart Required: Yes
Instructions:
1. Download patch from Schneider Electric portal 2. Apply according to vendor instructions 3. Restart affected systems 4. Verify patch application
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected systems from untrusted networks
Disable Network Transfer
allDisable network-accessible transfer command functionality if not required
🧯 If You Can't Patch
- Implement strict network access controls and firewall rules
- Monitor for suspicious transfer command activity and network connections
🔍 How to Verify
Check if Vulnerable:
Check system version against vendor advisory; test if transfer command is network-accessibleCheck Version:
Vendor-specific command; check product documentationVerify Fix Applied:
Verify patch version installed and test transfer command functionality📡 Detection & Monitoring
Log Indicators:
- Unusual transfer command usage
- Network connections to transfer service port
- Privilege escalation attempts
Network Indicators:
- Traffic to transfer service port from unexpected sources
- Malformed transfer commands
SIEM Query:
source_ip OUTSIDE trusted_networks AND dest_port = [transfer_service_port] AND protocol = TCP