CVE-2019-25343
📋 TL;DR
NextVPN 4.10 has insecure file permissions that allow local users to modify executable files with full access rights. Attackers can replace system executables with malicious files to gain SYSTEM or Administrator privileges through unauthorized file modification. This affects systems running NextVPN 4.10 with local user access.
💻 Affected Systems
- NextVPN
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Local attacker gains SYSTEM/Administrator privileges, enabling complete system compromise, data theft, persistence, and lateral movement.
Likely Case
Local user with standard privileges escalates to administrative rights, potentially installing malware or accessing sensitive data.
If Mitigated
Attack prevented through proper file permissions, privilege separation, or patching, limiting impact to user's own files.
🎯 Exploit Status
Exploit requires local user access but is simple to execute. Public exploit code exists on Exploit-DB.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 4.10
Vendor Advisory: https://vm3max.site
Restart Required: Yes
Instructions:
1. Download latest NextVPN version from official source. 2. Uninstall NextVPN 4.10. 3. Install updated version. 4. Restart system.
🔧 Temporary Workarounds
Restrict file permissions
allManually set proper file permissions on NextVPN executable directories to prevent unauthorized modifications.
chmod 755 /path/to/nextvpn/binaries (Linux)
icacls "C:\Program Files\NextVPN" /inheritance:r /grant:r "Users:RX" (Windows)
Remove local user access
allRestrict local access to systems running NextVPN to trusted administrators only.
🧯 If You Can't Patch
- Remove NextVPN 4.10 entirely from production systems
- Implement strict access controls and monitoring on affected systems
🔍 How to Verify
Check if Vulnerable:
Check NextVPN version: On Windows check Add/Remove Programs, on Linux check package manager or 'nextvpn --version'. If version is 4.10, system is vulnerable.Check Version:
nextvpn --version (Linux) or check program properties (Windows)Verify Fix Applied:
Verify NextVPN version is greater than 4.10 and check file permissions on NextVPN directories (should not be world-writable).📡 Detection & Monitoring
Log Indicators:
- Unexpected file modifications in NextVPN directories
- Process execution from unusual locations
- Privilege escalation events
Network Indicators:
- Unusual outbound connections from NextVPN processes
SIEM Query:
EventID=4688 AND (ProcessName LIKE '%nextvpn%' OR CommandLine LIKE '%nextvpn%') AND NewProcessName NOT LIKE '%nextvpn%'