CVE-2025-5106
📋 TL;DR
This critical vulnerability in Fujian Kelixun 1.0 allows remote attackers to execute arbitrary operating system commands via command injection in the fax_view.php file. Attackers can exploit this to gain unauthorized access and control over affected systems. Any organization using Fujian Kelixun 1.0 with the vulnerable component exposed is at risk.
💻 Affected Systems
- Fujian Kelixun
⚠️ 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
Full system compromise allowing attackers to execute arbitrary commands, install malware, exfiltrate data, pivot to other systems, and maintain persistent access.
Likely Case
Remote code execution leading to data theft, system disruption, or deployment of ransomware/cryptominers on vulnerable servers.
If Mitigated
Limited impact if proper network segmentation, least privilege, and input validation are implemented, though exploitation may still occur.
🎯 Exploit Status
Exploit details are publicly disclosed on GitHub, making it easy for attackers to weaponize. The vendor has not responded to disclosure attempts.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch exists. Consider workarounds or replacing the software if vendor does not provide updates.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict input validation and sanitization for the fax_file parameter to prevent command injection.
# Example PHP input sanitization
$fax_file = escapeshellarg($_GET['fax_file']);
# Use whitelisting for allowed characters
if (!preg_match('/^[a-zA-Z0-9._-]+$/', $fax_file)) {
die('Invalid input');
}
Disable or Restrict Access
linuxDisable the vulnerable fax_view.php component or restrict access via web server configuration.
# Apache: Deny access to fax_view.php
<Location "/app/fax/fax_view.php">
Deny from all
</Location>
# Nginx: Block access
location /app/fax/fax_view.php {
deny all;
}
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected systems from critical assets
- Deploy web application firewall (WAF) rules to block command injection patterns
🔍 How to Verify
Check if Vulnerable:
Check if /app/fax/fax_view.php exists and accepts fax_file parameter. Test with controlled input to see if command injection is possible.Check Version:
# Check Fujian Kelixun version if documented in files
find / -name "*kelixun*" -type f -exec grep -l "version" {} \; 2>/dev/nullVerify Fix Applied:
Verify that input validation prevents command execution by testing with malicious payloads. Ensure fax_view.php is disabled or properly secured.📡 Detection & Monitoring
Log Indicators:
- Unusual commands in web server logs containing fax_view.php with suspicious fax_file parameters
- System logs showing unexpected process execution from web server user
Network Indicators:
- HTTP requests to /app/fax/fax_view.php with shell metacharacters in parameters
- Outbound connections from web server to unexpected destinations
SIEM Query:
source="web_server_logs" AND uri_path="/app/fax/fax_view.php" AND (param="fax_file" AND value MATCHES "[;&|`$()]+")