CVE-2024-5313
📋 TL;DR
This vulnerability exposes an SSH interface on Schneider Electric products' network interfaces, allowing attackers to discover and potentially target the service. While authentication protects against direct exploitation, it enables reconnaissance activities like port scanning and fingerprinting. Organizations using affected Schneider Electric products are at risk.
💻 Affected Systems
- Schneider Electric products with exposed SSH interfaces (specific products not detailed in provided references)
📦 What is this software?
Evlink Home Firmware by Schneider Electric
Evlink Home Firmware by Schneider Electric
⚠️ Risk & Real-World Impact
Worst Case
Successful brute-force attacks on SSH credentials leading to unauthorized access, or denial of service attacks disrupting SSH service availability.
Likely Case
Network reconnaissance revealing SSH service presence, version information, and potential DoS attempts against the exposed interface.
If Mitigated
Limited to port scanning detection with no successful exploitation due to strong authentication controls and network segmentation.
🎯 Exploit Status
Exploitation requires bypassing authentication or conducting DoS attacks; reconnaissance tools can easily detect the exposed service.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in provided references
Vendor Advisory: https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2024-163-03&p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2024-163-03.pdf
Restart Required: Yes
Instructions:
1. Consult Schneider Electric advisory SEVD-2024-163-03. 2. Apply recommended firmware updates. 3. Restart affected devices. 4. Verify SSH interface is no longer unnecessarily exposed.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to SSH interfaces using firewalls or VLANs
SSH Hardening
linuxImplement strong authentication, disable root login, and use key-based authentication
# Edit /etc/ssh/sshd_config
PermitRootLogin no
PasswordAuthentication no
PubkeyAuthentication yes
🧯 If You Can't Patch
- Implement strict network access controls to limit SSH interface exposure
- Monitor SSH logs for brute-force attempts and unauthorized access attempts
🔍 How to Verify
Check if Vulnerable:
Use nmap or similar tools to scan for open SSH ports (typically port 22) on affected devices: nmap -p 22 <target_ip>Check Version:
Consult device management interface or Schneider Electric documentation for firmware version checkingVerify Fix Applied:
After patching, verify SSH port is no longer accessible from unauthorized networks and check firmware version matches patched release📡 Detection & Monitoring
Log Indicators:
- Failed SSH authentication attempts
- SSH service start/stop events
- Port scan detection alerts
Network Indicators:
- SSH banner grabs
- Unusual SSH traffic patterns
- Brute-force attack patterns
SIEM Query:
source="ssh_logs" AND (event="Failed password" OR event="Invalid user") | stats count by src_ip