CVE-2020-37205
📋 TL;DR
CVE-2020-37205 is a buffer overflow vulnerability in RemShutdown 2.9.0.0 that allows attackers to crash the application by sending overly long input to the 'Name' registration field. This affects users of RemShutdown 2.9.0.0 who have the application installed and accessible. The vulnerability enables denial of service attacks against the application.
💻 Affected Systems
- RemShutdown
📦 What is this software?
Remshutdown by Nsasoft
⚠️ Risk & Real-World Impact
Worst Case
Complete application crash leading to denial of service, potentially disrupting remote shutdown operations and system management functions.
Likely Case
Application becomes unresponsive and crashes, requiring manual restart to restore functionality.
If Mitigated
No impact if input validation is implemented or vulnerable version is not in use.
🎯 Exploit Status
Exploit code is publicly available and requires minimal technical skill to execute.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://www.nsauditor.com/
Restart Required: No
Instructions:
Check vendor website for updated version. If unavailable, consider alternative software or implement workarounds.
🔧 Temporary Workarounds
Input Length Restriction
windowsImplement input validation to restrict the 'Name' field to a reasonable character limit (e.g., 255 characters).
Not applicable - requires code modification
Network Access Control
windowsRestrict network access to RemShutdown to trusted users only using firewall rules.
netsh advfirewall firewall add rule name="Block RemShutdown" dir=in action=block program="C:\Path\To\RemShutdown.exe" enable=yes
🧯 If You Can't Patch
- Disable or uninstall RemShutdown if not essential for operations.
- Monitor application logs for crash events and investigate any suspicious activity.
🔍 How to Verify
Check if Vulnerable:
Check if RemShutdown version 2.9.0.0 is installed. Attempt to input a 1000+ character string into the 'Name' registration field to test for crash.Check Version:
Check application properties or About dialog in RemShutdown GUI.Verify Fix Applied:
Verify that input validation prevents buffer overflow by testing with long strings. Check that the application version has been updated if a patch becomes available.📡 Detection & Monitoring
Log Indicators:
- Application crash logs
- Unexpected termination events in Windows Event Viewer
Network Indicators:
- Unusual network traffic to RemShutdown port (default 8080)
- Multiple connection attempts with long payloads
SIEM Query:
EventID=1000 OR EventID=1001 AND SourceName="RemShutdown"