CVE-2019-25329
📋 TL;DR
CVE-2019-25329 is a buffer overflow vulnerability in FTP Navigator 8.03 that allows attackers to crash the application via denial of service by overwriting the Structured Exception Handler with malicious input. Users of FTP Navigator 8.03 on Windows systems are affected. The vulnerability is triggered when attackers paste a specific payload into the custom command input field.
💻 Affected Systems
- FTP Navigator
📦 What is this software?
Ftp Navigator by Internet Soft
⚠️ Risk & Real-World Impact
Worst Case
Complete application crash and denial of service, potentially disrupting file transfer operations and causing data loss if transfers are interrupted.
Likely Case
Application crash requiring restart, temporary disruption of FTP operations, and potential loss of unsaved work or interrupted transfers.
If Mitigated
Minimal impact with proper input validation and application hardening in place.
🎯 Exploit Status
Exploit requires user interaction to paste payload into the application. Public exploit code is available with specific payload pattern (4108 'A' + 4 'B' + 40 'C').
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://www.internet-soft.com/
Restart Required: No
Instructions:
No official patch available. Consider upgrading to newer versions if available or using alternative FTP clients.
🔧 Temporary Workarounds
Disable Custom Command Input
windowsRestrict or disable the custom command input functionality in FTP Navigator to prevent exploitation.
Application Hardening
windowsRun FTP Navigator with reduced privileges and implement application whitelisting to prevent unauthorized code execution.
🧯 If You Can't Patch
- Replace FTP Navigator with alternative FTP client software
- Implement network segmentation to isolate FTP Navigator systems from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check FTP Navigator version in Help > About. If version is 8.03, the system is vulnerable.Check Version:
Check Help > About menu within FTP Navigator applicationVerify Fix Applied:
Test by attempting to paste the exploit payload (4108 'A' + 4 'B' + 40 'C') into custom command input. If application doesn't crash, fix may be working.📡 Detection & Monitoring
Log Indicators:
- Application crash logs
- Windows Event Logs showing application termination
Network Indicators:
- Unusual FTP command patterns
- Large input strings in FTP sessions
SIEM Query:
EventID=1000 OR EventID=1001 AND ProcessName="ftpnav.exe" AND Version="8.03"