CVE-2025-29893
📋 TL;DR
An SQL injection vulnerability in Qsync Central allows authenticated remote attackers to execute arbitrary SQL commands. This could lead to unauthorized data access, modification, or command execution on affected systems. Organizations using vulnerable versions of Qsync Central are at risk.
💻 Affected Systems
- Qsync Central
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing data theft, data destruction, or installation of persistent backdoors
Likely Case
Unauthorized database access leading to data exfiltration or manipulation
If Mitigated
Limited impact due to network segmentation and minimal user privileges
🎯 Exploit Status
Requires authenticated access but SQL injection is typically straightforward to exploit
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Qsync Central 4.5.0.7 (2025/04/23) and later
Vendor Advisory: https://www.qnap.com/en/security-advisory/qsa-25-22
Restart Required: Yes
Instructions:
1. Log into QNAP App Center
2. Check for updates to Qsync Central
3. Update to version 4.5.0.7 or later
4. Restart Qsync Central service
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to Qsync Central to trusted networks only
Credential Hardening
allImplement strong password policies and multi-factor authentication
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach Qsync Central
- Apply principle of least privilege to Qsync Central user accounts
🔍 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 4.5.0.7 or higher in App Center📡 Detection & Monitoring
Log Indicators:
- Unusual SQL query patterns in application logs
- Multiple failed login attempts followed by successful login
Network Indicators:
- SQL syntax in HTTP POST parameters to Qsync Central endpoints
SIEM Query:
source="qsync.log" AND ("sql" OR "injection" OR "union select" OR "sleep(")