CVE-2023-29411
📋 TL;DR
This vulnerability allows unauthenticated attackers to change administrative credentials via the Java RMI interface, potentially leading to remote code execution. It affects Schneider Electric products with vulnerable Java RMI implementations. Systems exposed to untrusted networks are at highest risk.
💻 Affected Systems
- Schneider Electric products with vulnerable Java RMI implementations
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via remote code execution, allowing attackers to take full control of affected devices, steal data, or disrupt operations.
Likely Case
Unauthenticated attackers gain administrative access, modify configurations, and potentially execute arbitrary code on vulnerable systems.
If Mitigated
Limited impact with proper network segmentation and authentication controls, though the vulnerability still exists in the software.
🎯 Exploit Status
Exploitation requires access to the Java RMI interface. Attackers can directly call administrative functions without credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to 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. Review Schneider Electric advisory SEVD-2023-101-04. 2. Identify affected products and versions. 3. Apply vendor-provided patches or updates. 4. Restart affected systems as required. 5. Verify the fix is applied.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to Java RMI interface using firewall rules
# Example iptables rule to block RMI port (default 1099)
iptables -A INPUT -p tcp --dport 1099 -j DROP
# Windows Firewall rule
New-NetFirewallRule -DisplayName "Block Java RMI" -Direction Inbound -Protocol TCP -LocalPort 1099 -Action Block
Disable Java RMI Interface
allDisable the vulnerable Java RMI interface if not required
# Check Java RMI configuration
# Typically in java.rmi.server.hostname or com.sun.management.jmxremote.* properties
# Disable by setting -Djava.rmi.server.disableHttp=true or removing RMI configuration
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure of Java RMI interface
- Monitor for unauthorized administrative credential changes and RMI interface access
🔍 How to Verify
Check if Vulnerable:
Check if Java RMI interface is exposed on port 1099 (default) or configured ports: nmap -p 1099 <target_ip> or netstat -an | grep 1099Check Version:
Check product version using vendor-specific commands or administrative interfacesVerify Fix Applied:
Verify patch version matches vendor recommendations and test that administrative functions now require proper authentication📡 Detection & Monitoring
Log Indicators:
- Unauthenticated RMI connections
- Administrative credential changes from unexpected sources
- Failed authentication attempts on RMI interface
Network Indicators:
- Unusual traffic to Java RMI port (default 1099)
- RMI protocol traffic from untrusted networks
SIEM Query:
source_port=1099 AND (event_type="authentication_failure" OR event_type="credential_change")