CVE-2017-17103
📋 TL;DR
CVE-2017-17103 is a SQL injection vulnerability in Fiyo CMS 2.0.7 that allows attackers to manipulate database queries through user input fields. This enables privilege escalation from normal user to administrator, potentially granting full system control. Anyone running Fiyo CMS 2.0.7 with the vulnerable component enabled is affected.
💻 Affected Systems
- Fiyo CMS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with administrative access, data theft, and potential ransomware deployment
Likely Case
Unauthorized administrative access leading to website defacement, data manipulation, and backdoor installation
If Mitigated
Limited impact with proper input validation and database permissions restricting query execution
🎯 Exploit Status
Exploitation requires authenticated user access but SQL injection payloads are well-documented
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.0.8 or later
Vendor Advisory: https://github.com/FiyoCMS/FiyoCMS/issues/10
Restart Required: No
Instructions:
1. Backup current installation. 2. Download Fiyo CMS 2.0.8 or later. 3. Replace vulnerable files. 4. Verify functionality.
🔧 Temporary Workarounds
Input Validation Filter
allAdd parameterized queries and input validation to sys_user.php
Modify /apps/app_user/sys_user.php to use prepared statements for $_POST[name] and $_POST[email]
Access Restriction
linuxTemporarily disable or restrict access to vulnerable component
chmod 000 /apps/app_user/sys_user.php
Add authentication middleware to restrict access
🧯 If You Can't Patch
- Implement web application firewall (WAF) with SQL injection rules
- Restrict database user permissions to minimum required
🔍 How to Verify
Check if Vulnerable:
Check if running Fiyo CMS 2.0.7 and if /apps/app_user/sys_user.php exists and processes $_POST parameters without validationCheck Version:
Check CMS configuration files or admin panel for version informationVerify Fix Applied:
Verify version is 2.0.8+ and test SQL injection payloads against name/email fields return errors instead of executing📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed login attempts followed by successful admin access
- POST requests to sys_user.php with SQL keywords
Network Indicators:
- HTTP POST requests containing SQL injection patterns to vulnerable endpoint
SIEM Query:
source="web_logs" AND uri="/apps/app_user/sys_user.php" AND (request_body CONTAINS "UNION" OR request_body CONTAINS "SELECT" OR request_body CONTAINS "OR 1=1")