CVE-2020-37200
📋 TL;DR
NetShareWatcher 1.5.8.0 contains a buffer overflow vulnerability in the registration key input field. Attackers can crash the application by supplying oversized input (1000+ characters), causing denial of service. This affects all users running the vulnerable version of NetShareWatcher.
💻 Affected Systems
- NetShareWatcher
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete application crash leading to denial of service, potentially disrupting network monitoring and file sharing visibility.
Likely Case
Application crash requiring manual restart, temporarily disrupting network share monitoring functionality.
If Mitigated
Minimal impact if application is isolated or has automatic restart capabilities.
🎯 Exploit Status
Exploit requires access to the application interface to paste payload into registration key field. Public exploit code available on Exploit-DB.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://www.nsauditor.com/
Restart Required: No
Instructions:
No official patch available. Check vendor website for updated version. Consider workarounds or alternative software.
🔧 Temporary Workarounds
Input Validation Restriction
windowsImplement input validation to restrict registration key field to reasonable length
Not applicable - requires code modification
Application Isolation
windowsRun NetShareWatcher in isolated environment with limited user access
Use Windows Sandbox or VM for running the application
🧯 If You Can't Patch
- Restrict access to NetShareWatcher interface to trusted users only
- Implement monitoring for application crashes and unusual registration key attempts
🔍 How to Verify
Check if Vulnerable:
Check Help > About in NetShareWatcher to confirm version is 1.5.8.0Check Version:
Check application interface: Help > AboutVerify Fix Applied:
Test by attempting to paste 1000+ characters into registration key field - application should not crash📡 Detection & Monitoring
Log Indicators:
- Application crash logs
- Unexpected termination events in Windows Event Log
Network Indicators:
- Sudden cessation of network monitoring traffic from NetShareWatcher
SIEM Query:
EventID: 1000 OR EventID: 1001 Source: NetShareWatcher.exe