CVE-2017-7625
📋 TL;DR
This vulnerability allows unauthenticated attackers to upload malicious PHP files (webshells) to Fiyo CMS servers and execute arbitrary code. It affects all Fiyo CMS 2.x installations up to version 2.0.7. Attackers can achieve full system compromise through remote code execution.
💻 Affected Systems
- Fiyo CMS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete server takeover with attacker gaining root/system-level access, data exfiltration, ransomware deployment, and use as pivot point for lateral movement.
Likely Case
Webshell installation leading to website defacement, data theft, cryptocurrency mining, or botnet recruitment.
If Mitigated
Attack blocked at WAF/web application firewall level with file upload restrictions and input validation.
🎯 Exploit Status
Multiple public exploit scripts available. Attack requires only HTTP POST request to vulnerable endpoint with malicious content.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.0.8 or later
Vendor Advisory: https://github.com/FiyoCMS/FiyoCMS
Restart Required: No
Instructions:
1. Backup current installation and database. 2. Download latest version from official repository. 3. Replace all files except config.php and uploads directory. 4. Verify functionality.
🔧 Temporary Workarounds
Block vulnerable endpoint
allRestrict access to the vulnerable PHP file via web server configuration
# Apache: add to .htaccess
<Files "save_file.php">
Order Deny,Allow
Deny from all
</Files>
# Nginx: add to server block
location ~* /dapur/apps/app_theme/libs/save_file\.php$ {
deny all;
return 403;
}
Disable file uploads
linuxRemove write permissions from upload directories
chmod -R 755 /path/to/fiyo/dapur/apps/app_theme/libs/
chown -R root:www-data /path/to/fiyo/dapur/apps/app_theme/libs/
🧯 If You Can't Patch
- Implement strict WAF rules to block requests containing webshell patterns and file uploads to the vulnerable endpoint.
- Isolate the Fiyo CMS instance in a DMZ with strict outbound firewall rules and monitor for suspicious file creation.
🔍 How to Verify
Check if Vulnerable:
Check if file exists at /dapur/apps/app_theme/libs/save_file.php and test with harmless payload using curl: curl -X POST -d 'content=<?php echo "test"; ?>' http://target/dapur/apps/apps/app_theme/libs/save_file.phpCheck Version:
grep -r "version" /path/to/fiyo/ | grep -i "2.0"Verify Fix Applied:
Attempt the same exploit after patching - should receive 403/404 error or proper validation failure. Check version number in admin panel.📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /dapur/apps/app_theme/libs/save_file.php
- File creation in theme directories with .php extension
- Unusual PHP file execution patterns
Network Indicators:
- POST requests with PHP code in content parameter
- Subsequent connections to uploaded PHP files from unusual IPs
SIEM Query:
source="web_logs" AND (url="/dapur/apps/app_theme/libs/save_file.php" OR url CONTAINS ".php" AND referer CONTAINS "save_file.php")