CVE-2020-37199
📋 TL;DR
NBMonitor 1.6.6.0 contains a buffer overflow vulnerability in its registration key input field that allows attackers to crash the application by pasting a 1000-character payload. This creates a denial of service condition where the monitoring software becomes unavailable. All users running NBMonitor 1.6.6.0 are affected.
💻 Affected Systems
- NBMonitor
📦 What is this software?
Nbmonitor by Nsasoft
⚠️ Risk & Real-World Impact
Worst Case
Complete application crash leading to loss of monitoring capabilities, potentially affecting business operations that rely on NBMonitor for system oversight.
Likely Case
Application becomes unresponsive and requires restart, causing temporary monitoring gaps until service is restored.
If Mitigated
Minimal impact with proper input validation and monitoring redundancy in place.
🎯 Exploit Status
Exploit requires physical or remote access to the application interface to paste the payload into the key field.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://www.nsauditor.com/
Restart Required: No
Instructions:
Check vendor website for updated version. If available, download and install the patched version. No specific patch version is documented for this CVE.
🔧 Temporary Workarounds
Input Validation
windowsImplement input validation to restrict key field length to reasonable values
Application Isolation
windowsRun NBMonitor in isolated environment with limited user access
🧯 If You Can't Patch
- Restrict physical and remote access to NBMonitor application interface
- Implement redundant monitoring solutions to maintain visibility if NBMonitor crashes
🔍 How to Verify
Check if Vulnerable:
Check NBMonitor version in application Help > About menu. If version is 1.6.6.0, system is vulnerable.Check Version:
Check Help > About menu in NBMonitor applicationVerify Fix Applied:
Test by attempting to paste a 1000-character string into the registration key field. If application does not crash, fix is likely applied.📡 Detection & Monitoring
Log Indicators:
- Application crash logs
- Unexpected NBMonitor termination events
Network Indicators:
- Sudden cessation of monitoring traffic from NBMonitor host
SIEM Query:
EventID: 1000 OR EventID: 1001 Source: NBMonitor.exe