CVE-2024-41936
📋 TL;DR
An unauthenticated directory traversal vulnerability in Vonets industrial wifi bridge devices allows remote attackers to read arbitrary files and bypass authentication. This affects Vonets industrial wifi bridge relays and repeaters running software versions 3.3.23.6.9 and earlier. Attackers can exploit this without credentials to access sensitive system files.
💻 Affected Systems
- Vonets industrial wifi bridge relays
- Vonets industrial wifi bridge repeaters
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to industrial network infiltration, data exfiltration, and potential disruption of industrial operations.
Likely Case
Unauthorized access to configuration files, credentials, and sensitive data stored on the device, enabling further attacks on connected industrial systems.
If Mitigated
Limited to information disclosure if device is isolated and file access is restricted through other controls.
🎯 Exploit Status
Directory traversal vulnerabilities are typically easy to exploit with simple HTTP requests. The authentication bypass aspect makes this particularly dangerous.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.3.23.6.10 or later
Vendor Advisory: https://www.cisa.gov/news-events/ics-advisories/icsa-24-214-08
Restart Required: Yes
Instructions:
1. Check current firmware version. 2. Download latest firmware from Vonets vendor portal. 3. Upload firmware via device web interface. 4. Apply update and restart device. 5. Verify new version is running.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Vonets devices from internet and restrict network access to trusted industrial networks only.
Access Control Lists
allImplement firewall rules to restrict access to Vonets device management interfaces.
🧯 If You Can't Patch
- Immediately remove internet-facing access and place devices behind firewalls with strict ingress filtering.
- Implement network monitoring for unusual file access patterns and authentication bypass attempts.
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or SSH. If version is 3.3.23.6.9 or earlier, device is vulnerable.Check Version:
Check via device web interface at System > Firmware or via SSH: cat /etc/versionVerify Fix Applied:
Verify firmware version is 3.3.23.6.10 or later after patching. Test authentication requirements and file access restrictions.📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns
- Authentication bypass attempts
- Directory traversal strings in HTTP logs
Network Indicators:
- HTTP requests with '../' sequences
- Unauthenticated access to sensitive endpoints
SIEM Query:
http.uri contains "../" AND (device.vendor="Vonets" OR device.type="industrial_wifi_bridge")