CVE-2025-53595
📋 TL;DR
An SQL injection vulnerability in Qsync Central allows authenticated attackers to execute arbitrary SQL commands. This could lead to unauthorized data access, modification, or command execution. Organizations using vulnerable versions of Qsync Central are affected.
💻 Affected Systems
- Qsync Central
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise including data exfiltration, ransomware deployment, or persistent backdoor installation
Likely Case
Data theft, privilege escalation, or service disruption
If Mitigated
Limited impact due to network segmentation and least privilege controls
🎯 Exploit Status
SQL injection vulnerabilities are typically easy to exploit once discovered
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.0.0.2 (2025/07/31) and later
Vendor Advisory: https://www.qnap.com/en/security-advisory/qsa-25-35
Restart Required: Yes
Instructions:
1. Backup configuration and data. 2. Download Qsync Central 5.0.0.2 or later from QNAP website. 3. Install update via QNAP App Center. 4. Restart Qsync Central service.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to Qsync Central to trusted networks only
Account Review
allAudit and remove unnecessary user accounts, enforce strong passwords
🧯 If You Can't Patch
- Implement web application firewall with SQL injection rules
- Disable Qsync Central service if not essential
🔍 How to Verify
Check if Vulnerable:
Check Qsync Central version in QNAP App Center or via SSH: cat /etc/config/uLinux.conf | grep qsyncCheck Version:
cat /etc/config/uLinux.conf | grep 'qsync.*version'Verify Fix Applied:
Verify version is 5.0.0.2 or higher in App Center📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in application logs
- Multiple failed login attempts followed by SQL syntax in requests
Network Indicators:
- SQL keywords in HTTP POST parameters to Qsync Central endpoints
SIEM Query:
source="qsync.log" AND ("UNION" OR "SELECT *" OR "DROP TABLE" OR "INSERT INTO")