CVE-2014-7175
📋 TL;DR
This vulnerability allows attackers to write arbitrary data to the fsUI.xyz file via the fsSaveUIPersistence.php script in FarLinX X25 Gateway. This could lead to remote code execution or system compromise. Organizations using FarLinX X25 Gateway through version 2014-09-25 are affected.
💻 Affected Systems
- FarLinX X25 Gateway
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
File system manipulation allowing attackers to modify configuration files, install backdoors, or disrupt operations.
If Mitigated
Limited impact with proper network segmentation and file system permissions preventing arbitrary writes.
🎯 Exploit Status
The vulnerability involves a simple HTTP POST request to write arbitrary data to a file, making exploitation straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No known vendor advisory
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available, or implement workarounds.
🔧 Temporary Workarounds
Remove vulnerable script
linuxDelete or rename the fsSaveUIPersistence.php file to prevent exploitation.
rm /path/to/farlinx/fsSaveUIPersistence.php
mv /path/to/farlinx/fsSaveUIPersistence.php /path/to/farlinx/fsSaveUIPersistence.php.disabled
Restrict file permissions
linuxSet strict file permissions on the fsUI.xyz file and directory to prevent unauthorized writes.
chmod 600 /path/to/farlinx/fsUI.xyz
chown root:root /path/to/farlinx/fsUI.xyz
🧯 If You Can't Patch
- Implement strict network access controls to limit access to the FarLinX X25 Gateway to trusted IP addresses only.
- Deploy a web application firewall (WAF) with rules to block requests to fsSaveUIPersistence.php and monitor for exploitation attempts.
🔍 How to Verify
Check if Vulnerable:
Check if the file /path/to/farlinx/fsSaveUIPersistence.php exists and is accessible via HTTP POST requests.Check Version:
Check the FarLinX X25 Gateway documentation or configuration files for version information, as specific commands may vary.Verify Fix Applied:
Verify that fsSaveUIPersistence.php is removed, renamed, or inaccessible, and that fsUI.xyz has restricted permissions.📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to fsSaveUIPersistence.php in web server logs
- Unauthorized file modifications to fsUI.xyz in system logs
Network Indicators:
- HTTP POST requests to /fsSaveUIPersistence.php with file write parameters
SIEM Query:
source="web_server" AND (url="/fsSaveUIPersistence.php" OR method="POST" AND url CONTAINS "fsSaveUIPersistence")