CVE-2025-57714
📋 TL;DR
An unquoted search path vulnerability in NetBak Replicator allows local attackers with user accounts to execute arbitrary code by placing malicious executables in paths that Windows searches before the legitimate application. This affects all users running vulnerable versions of NetBak Replicator on Windows systems.
💻 Affected Systems
- QNAP NetBak Replicator
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation to SYSTEM-level access, enabling complete system compromise, data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Local attacker gains elevated privileges to install malware, steal credentials, or pivot to other systems on the network.
If Mitigated
Limited to user-level impact if proper application whitelisting and path restrictions are enforced.
🎯 Exploit Status
Unquoted path vulnerabilities are well-understood and easily weaponized. Requires local access but exploitation is straightforward once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: NetBak Replicator 4.5.15.0807 and later
Vendor Advisory: https://www.qnap.com/en/security-advisory/qsa-25-39
Restart Required: Yes
Instructions:
1. Download NetBak Replicator 4.5.15.0807 or later from QNAP website. 2. Uninstall current version. 3. Install updated version. 4. Restart the system.
🔧 Temporary Workarounds
Restrict write permissions to application directories
windowsPrevent users from writing to directories in the NetBak Replicator installation path
icacls "C:\Program Files\QNAP\NetBak Replicator" /deny Users:(OI)(CI)W
Quote service paths in registry
windowsManually add quotes around the service executable path in Windows Registry
reg add "HKLM\SYSTEM\CurrentControlSet\Services\NetBakReplicator" /v ImagePath /t REG_EXPAND_SZ /d "\"C:\Program Files\QNAP\NetBak Replicator\nb_service.exe\"" /f
🧯 If You Can't Patch
- Remove NetBak Replicator from systems where it's not essential
- Implement application control/whitelisting to prevent execution of unauthorized binaries
🔍 How to Verify
Check if Vulnerable:
Check NetBak Replicator version via Control Panel > Programs and Features. If version is below 4.5.15.0807, system is vulnerable.Check Version:
wmic product where "name like 'NetBak Replicator%'" get versionVerify Fix Applied:
Confirm version is 4.5.15.0807 or higher in Control Panel > Programs and Features.📡 Detection & Monitoring
Log Indicators:
- Windows Event ID 4688 with parent process from NetBak Replicator paths
- Unexpected child processes spawned from NetBak Replicator service
Network Indicators:
- Unusual outbound connections from systems running NetBak Replicator
SIEM Query:
source="windows" EventCode=4688 ParentProcessName="*\NetBak Replicator\*" | stats count by ProcessName