CVE-2025-57714 Overview
CVE-2025-57714 is an unquoted search path or element vulnerability [CWE-428] affecting QNAP NetBak Replicator. A local attacker with a valid user account can exploit the flaw to execute unauthorized code or commands on the affected host. QNAP addressed the issue in NetBak Replicator version 4.5.15.0807 and later. The vulnerability requires local access and low-level privileges but yields high impact on confidentiality, integrity, and availability of the affected system.
Critical Impact
A local user can hijack the execution path of the NetBak Replicator service to run attacker-controlled binaries, typically with the privileges of the service account.
Affected Products
- QNAP NetBak Replicator versions prior to 4.5.15.0807
- Windows hosts running the vulnerable NetBak Replicator client
- Backup workflows that depend on the NetBak Replicator service
Discovery Timeline
- 2025-10-03 - CVE-2025-57714 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-57714
Vulnerability Analysis
The flaw stems from an unquoted service path in NetBak Replicator. When Windows encounters a service executable path containing spaces without surrounding quotes, it attempts to resolve each space-delimited segment as a potential executable. An attacker who can write to any intermediate directory in the search path can plant a malicious binary that Windows will load in place of the intended service executable.
Exploitation requires local access and a valid user account on the system. The attack does not depend on user interaction and is straightforward once write access to an intermediate directory exists. Successful exploitation typically yields code execution under the privileges of the NetBak Replicator service account, which often runs with elevated permissions.
Root Cause
The root cause is improper quoting of the service binary path during installation or registration of the NetBak Replicator Windows service. This falls under CWE-428: Unquoted Search Path or Element. The Windows Service Control Manager parses unquoted paths ambiguously, allowing precedence for attacker-supplied executables placed earlier in the resolved path.
Attack Vector
A local attacker with a standard user account identifies the unquoted service path referenced by NetBak Replicator. The attacker then places a malicious executable named to match an intermediate path segment (for example, Program.exe in C:\). When the service starts, whether at boot or through a triggered restart, Windows executes the planted binary. The vulnerability enables local privilege escalation rather than remote compromise. See the QNAP Security Advisory QSA-25-39 for vendor-supplied technical details.
Detection Methods for CVE-2025-57714
Indicators of Compromise
- Presence of unexpected executables in root directories such as C:\Program.exe or C:\Program Files\Common.exe
- New or unauthorized files placed within any directory referenced by the NetBak Replicator service path
- NetBak Replicator service starting from an unexpected binary location
- Anomalous child processes spawned by the NetBak Replicator service account
Detection Strategies
- Enumerate installed Windows services and flag any service whose ImagePath contains spaces without surrounding quotes
- Compare running NetBak Replicator binary paths against the expected installation location
- Audit file creation events in top-level drive directories and Program Files parent folders
- Track service start events (Event ID 7036) correlated with recent file writes in intermediate path segments
Monitoring Recommendations
- Enable Windows process creation logging (Event ID 4688) with command line auditing enabled
- Monitor writes to directories that appear in unquoted service paths, particularly by non-administrative accounts
- Alert on modifications to the NetBak Replicator service configuration in the registry under HKLM\SYSTEM\CurrentControlSet\Services
How to Mitigate CVE-2025-57714
Immediate Actions Required
- Upgrade NetBak Replicator to version 4.5.15.0807 or later on all Windows hosts
- Inventory Windows services on hosts running NetBak Replicator and confirm the ImagePath value is properly quoted after upgrade
- Restrict write permissions on root directories and intermediate path segments to administrators only
- Review NetBak Replicator service account privileges and apply least privilege where possible
Patch Information
QNAP fixed the vulnerability in NetBak Replicator 4.5.15.0807 and later. Refer to QNAP Security Advisory QSA-25-39 for the official patch guidance and download instructions.
Workarounds
- Manually quote the service ImagePath value in the registry if immediate patching is not possible
- Remove write permissions for non-administrative users on C:\ and any Program Files parent directory referenced in the service path
- Disable the NetBak Replicator service on hosts where it is not required until patching can be completed
# Query the NetBak Replicator service configuration to inspect ImagePath
sc qc "NetBak Replicator"
# Example fix: rewrite the ImagePath with proper quoting (run as administrator)
sc config "NetBak Replicator" binPath= "\"C:\Program Files\QNAP\NetBak Replicator\NetBakService.exe\""
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
