CVE-2020-37069
📋 TL;DR
CVE-2020-37069 is a critical buffer overflow vulnerability in Konica Minolta FTP Utility 1.0 that allows attackers to crash the FTP server and potentially execute arbitrary code by sending an oversized buffer to the NLST command. This affects all users running the vulnerable FTP utility version. The vulnerability requires network access to the FTP service.
💻 Affected Systems
- Konica Minolta FTP Utility
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Denial of service (FTP server crash) with potential for limited code execution in constrained environments.
If Mitigated
Service disruption only if proper network segmentation and exploit mitigations are in place.
🎯 Exploit Status
Public exploit code available on Exploit-DB (ID 48502) demonstrates buffer overflow with 1500 'A' characters.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: https://www.konicaminolta.us/
Restart Required: No
Instructions:
No official patch available. Consider alternative FTP solutions or implement workarounds.
🔧 Temporary Workarounds
Disable FTP Service
windowsStop and disable the Konica Minolta FTP Utility service
sc stop "Konica Minolta FTP Utility"
sc config "Konica Minolta FTP Utility" start= disabled
Network Segmentation
windowsRestrict network access to FTP service using firewall rules
netsh advfirewall firewall add rule name="Block Konica FTP" dir=in action=block protocol=TCP localport=21
🧯 If You Can't Patch
- Replace with alternative secure FTP server software
- Implement strict network access controls and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check if Konica Minolta FTP Utility 1.0 is installed and running on port 21Check Version:
Check installed programs in Control Panel or registry: HKEY_LOCAL_MACHINE\SOFTWARE\Konica Minolta\FTP UtilityVerify Fix Applied:
Verify service is stopped/disabled or replaced with alternative software📡 Detection & Monitoring
Log Indicators:
- FTP service crash logs
- Unusual large NLST command patterns in FTP logs
Network Indicators:
- TCP port 21 traffic with large payloads (>1000 bytes) to NLST command
SIEM Query:
source="ftp.log" AND command="NLST" AND size>1000