CVE-2023-29413
📋 TL;DR
This vulnerability allows unauthenticated attackers to cause Denial-of-Service on Schneider UPS Monitor service by exploiting missing authentication for critical functions. It affects organizations using Schneider Electric UPS monitoring systems with vulnerable versions exposed to untrusted networks.
💻 Affected Systems
- Schneider Electric UPS Monitor
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption of UPS monitoring, potentially affecting power management visibility and alerting capabilities for critical infrastructure.
Likely Case
Temporary service interruption requiring manual restart of UPS Monitor service, disrupting monitoring but not affecting actual UPS power delivery.
If Mitigated
No impact if proper network segmentation and authentication controls prevent unauthorized access to the service.
🎯 Exploit Status
Exploitation requires network access to the UPS Monitor service port but no authentication or special tools.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Consult Schneider Electric advisory SEVD-2023-101-04 for specific patched versions
Vendor Advisory: https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2023-101-04&p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2023-101-04.pdf
Restart Required: Yes
Instructions:
1. Download patch from Schneider Electric portal. 2. Apply to affected UPS Monitor installations. 3. Restart UPS Monitor service. 4. Verify service functionality.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to UPS Monitor service to only authorized management systems
firewall rules to block unauthorized access to UPS Monitor port
Service Access Control
allImplement network-level authentication or VPN for remote access to UPS management
🧯 If You Can't Patch
- Implement strict network firewall rules to allow only trusted IPs to access UPS Monitor service
- Place UPS Monitor systems on isolated management network segments
🔍 How to Verify
Check if Vulnerable:
Check if UPS Monitor service is accessible without authentication from untrusted networksCheck Version:
Check UPS Monitor software version in application interface or consult vendor documentationVerify Fix Applied:
Verify patch version installed and test that unauthenticated requests no longer cause service disruption📡 Detection & Monitoring
Log Indicators:
- Multiple connection attempts to UPS Monitor service from unauthorized sources
- Service restart events without legitimate cause
Network Indicators:
- Unusual traffic patterns to UPS Monitor service port from unexpected sources
SIEM Query:
source_ip NOT IN (trusted_management_ips) AND destination_port = ups_monitor_port AND protocol = TCP