CVE-2024-3741
📋 TL;DR
Electrolink transmitters have an authentication bypass vulnerability where attackers can gain full system access by setting any value except 'NO' in the login cookie. This affects all organizations using vulnerable Electrolink transmitter devices. Attackers can compromise industrial control systems without valid credentials.
💻 Affected Systems
- Electrolink transmitters
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of industrial control systems allowing attackers to manipulate transmitter operations, disrupt critical infrastructure, or cause physical damage to equipment.
Likely Case
Unauthorized access to transmitter configuration and control interfaces, potentially allowing manipulation of industrial processes or data exfiltration.
If Mitigated
Limited impact if devices are isolated in segmented networks with strict access controls and monitoring.
🎯 Exploit Status
Exploitation requires only setting a cookie value, making it trivial for attackers with network access to vulnerable devices.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched versions
Vendor Advisory: https://www.cisa.gov/news-events/ics-advisories/icsa-24-107-02
Restart Required: Yes
Instructions:
1. Contact Electrolink vendor for patched firmware. 2. Backup current configuration. 3. Apply firmware update following vendor instructions. 4. Restart device. 5. Verify authentication now properly validates login cookies.
🔧 Temporary Workarounds
Network segmentation
allIsolate Electrolink transmitters in dedicated network segments with strict firewall rules
Access control lists
allImplement strict IP-based access controls to limit which systems can communicate with transmitters
🧯 If You Can't Patch
- Implement network segmentation to isolate vulnerable devices from untrusted networks
- Deploy intrusion detection systems to monitor for authentication bypass attempts
🔍 How to Verify
Check if Vulnerable:
Attempt to access transmitter web interface with a cookie value other than 'NO' (e.g., 'YES', '1', 'true') and check if authentication is bypassedCheck Version:
Check device web interface or console for firmware version informationVerify Fix Applied:
After patching, attempt the same cookie manipulation and verify proper authentication is required📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts followed by successful access with unusual cookie values
- Access from unauthorized IP addresses
Network Indicators:
- HTTP requests with manipulated login cookies to transmitter endpoints
- Unusual traffic patterns to industrial control devices
SIEM Query:
source="transmitter_logs" AND (cookie="YES" OR cookie="1" OR cookie="true") AND action="login_success"