CVE-2024-37036
📋 TL;DR
CVE-2024-37036 is an out-of-bounds write vulnerability in Schneider Electric products that allows authentication bypass when attackers send malformed POST requests under specific configurations. This affects Schneider Electric systems with particular parameter settings, potentially exposing critical infrastructure to unauthorized access.
💻 Affected Systems
- Schneider Electric products listed in SEVD-2024-163-05 advisory
📦 What is this software?
Sage Rtu Firmware by Schneider Electric
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to bypass authentication, gain administrative access, and potentially execute arbitrary code on affected Schneider Electric devices.
Likely Case
Authentication bypass leading to unauthorized access to control systems, configuration modification, and potential disruption of industrial operations.
If Mitigated
Limited impact with proper network segmentation, authentication controls, and monitoring in place to detect and block malicious requests.
🎯 Exploit Status
Exploitation requires sending malformed POST requests to vulnerable endpoints with specific configuration parameters enabled
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions specified in Schneider Electric advisory SEVD-2024-163-05
Vendor Advisory: https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2024-163-05&p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2024-163-05.pdf
Restart Required: Yes
Instructions:
1. Review Schneider Electric advisory SEVD-2024-163-05. 2. Identify affected products and versions. 3. Apply vendor-provided patches or firmware updates. 4. Restart affected systems as required. 5. Verify patch application and system functionality.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected Schneider Electric systems from untrusted networks and internet access
Configuration Hardening
allDisable or modify the specific configuration parameters that enable this vulnerability
🧯 If You Can't Patch
- Implement strict network access controls to limit access to affected systems
- Enable comprehensive logging and monitoring for authentication bypass attempts
🔍 How to Verify
Check if Vulnerable:
Check system version against affected versions in Schneider Electric advisory SEVD-2024-163-05 and verify specific configuration parameters are setCheck Version:
Vendor-specific command to check firmware/software version (consult product documentation)Verify Fix Applied:
Verify system version is updated to patched version specified in vendor advisory and test authentication functionality📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts followed by successful access
- Malformed POST requests to authentication endpoints
- Unusual authentication patterns
Network Indicators:
- Malformed HTTP POST requests to Schneider Electric system endpoints
- Traffic patterns indicating authentication bypass attempts
SIEM Query:
source="schneider_system" AND (http_method="POST" AND http_status="200" AND (uri CONTAINS "auth" OR uri CONTAINS "login") AND request_size>threshold)