CVE-2025-41664
📋 TL;DR
This vulnerability allows low-privileged remote attackers to access critical system resources like firmware and certificates due to improper permission handling in FTP/SFTP services. Attackers could escalate privileges and modify firmware, potentially compromising device integrity. Systems running vulnerable FTP/SFTP services with improper permission configurations are affected.
💻 Affected Systems
- Specific products not identified in provided reference
⚠️ 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
Complete system compromise through firmware modification, allowing persistent backdoors, credential theft, and lateral movement across the network.
Likely Case
Unauthorized access to sensitive files and certificates, enabling privilege escalation and potential data exfiltration.
If Mitigated
Limited impact with proper access controls, network segmentation, and monitoring preventing exploitation.
🎯 Exploit Status
Requires low-privileged access to exploit. Attack path involves abusing improper permission handling during service runtime.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://certvde.com/de/advisories/VDE-2025-048
Restart Required: Yes
Instructions:
1. Check VDE advisory for specific vendor patches. 2. Apply vendor-provided security updates. 3. Restart affected services. 4. Verify permissions are properly configured.
🔧 Temporary Workarounds
Disable unnecessary FTP/SFTP services
linuxTurn off FTP/SFTP services that are not required for business operations
systemctl stop ftp
systemctl disable ftp
systemctl stop sftp
systemctl disable sftp
Implement strict file permissions
linuxSet proper ownership and permissions on sensitive directories and files
chmod 600 /path/to/sensitive/files
chown root:root /path/to/sensitive/files
🧯 If You Can't Patch
- Implement network segmentation to isolate FTP/SFTP services
- Enable strict access controls and monitoring for file access patterns
🔍 How to Verify
Check if Vulnerable:
Review service configurations and file permissions for FTP/SFTP services. Check if low-privileged users can access sensitive directories.Check Version:
Check with vendor-specific commands or consult VDE-2025-048 advisoryVerify Fix Applied:
Verify file permissions are properly set and low-privileged users cannot access sensitive resources. Test access attempts.📡 Detection & Monitoring
Log Indicators:
- Unauthorized file access attempts in FTP/SFTP logs
- Permission denied errors followed by successful access
- Unusual file access patterns from low-privileged accounts
Network Indicators:
- Unusual FTP/SFTP traffic patterns
- Multiple failed followed by successful authentication attempts
SIEM Query:
source="ftp.log" OR source="sftp.log" | search (event="access" OR event="read") AND (file="*firmware*" OR file="*certificate*") AND user!="root"