CVE-2023-4990
📋 TL;DR
A directory traversal vulnerability in MCL-Net versions before 4.6 Update Package (P01) allows attackers to read arbitrary files on the system. This affects organizations using vulnerable MCL-Net software for mobility platform management.
💻 Affected Systems
- MCL-Net
📦 What is this software?
Espeak Ng by Espeak Ng
Mcl Net Firmware by Mcl Collection
⚠️ Risk & Real-World Impact
Worst Case
Attackers could read sensitive system files, configuration files, or credential files, potentially leading to full system compromise.
Likely Case
Attackers read configuration files containing sensitive information or application data.
If Mitigated
Limited to reading non-sensitive files if proper file permissions and access controls are implemented.
🎯 Exploit Status
Directory traversal vulnerabilities typically have low exploitation complexity and may not require authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.6 Update Package (P01)
Vendor Advisory: https://www.mcl-mobilityplatform.com/downloads.php
Restart Required: Yes
Instructions:
1. Download the 4.6 Update Package (P01) from the vendor website. 2. Apply the update following vendor instructions. 3. Restart the MCL-Net service or system.
🔧 Temporary Workarounds
Restrict file access permissions
linuxSet strict file permissions on sensitive directories and files to limit what can be read.
chmod 600 /path/to/sensitive/files
chown root:root /path/to/sensitive/files
Implement web application firewall rules
allBlock directory traversal patterns in HTTP requests.
🧯 If You Can't Patch
- Isolate the vulnerable system from untrusted networks
- Implement strict network segmentation and access controls
🔍 How to Verify
Check if Vulnerable:
Check MCL-Net version number in application interface or configuration files.Check Version:
Check application documentation for version command, typically in admin interface.Verify Fix Applied:
Verify version shows 4.6 Update Package (P01) or later after patching.📡 Detection & Monitoring
Log Indicators:
- Unusual file access patterns
- HTTP requests containing '../' sequences
- Access to files outside expected directories
Network Indicators:
- HTTP requests with directory traversal payloads (e.g., ../../../etc/passwd)
SIEM Query:
http.url:*../* AND (http.status:200 OR http.status:404)