CVE-2025-29892 Overview
CVE-2025-29892 is a SQL injection vulnerability [CWE-89] affecting QNAP Qsync Central. The flaw allows remote attackers with authenticated user access to inject malicious SQL statements through the application interface. Successful exploitation enables execution of unauthorized code or commands against the underlying database and application context.
QNAP addressed the issue in Qsync Central version 4.5.0.6 released on 2025/03/20. Administrators running earlier versions remain exposed to credentialed remote attacks targeting the file synchronization service deployed on QNAP NAS appliances.
Critical Impact
Authenticated remote attackers can execute unauthorized SQL queries and commands against Qsync Central, compromising confidentiality, integrity, and availability of the synchronization database and associated NAS data.
Affected Products
- QNAP Qsync Central versions prior to 4.5.0.6
- QNAP NAS appliances running vulnerable Qsync Central builds
- Centrally managed file synchronization deployments using QNAP storage
Discovery Timeline
- 2025-06-06 - CVE-2025-29892 published to NVD
- 2025-09-20 - Last updated in NVD database
Technical Details for CVE-2025-29892
Vulnerability Analysis
The vulnerability is a SQL injection flaw classified under [CWE-89] (Improper Neutralization of Special Elements used in an SQL Command). Qsync Central is QNAP's centralized file synchronization application running on QNAP NAS devices. The product accepts user-supplied input that is incorporated into SQL queries without sufficient sanitization or parameterization.
An attacker authenticated to the application can supply crafted SQL payloads through vulnerable request parameters. The database engine then interprets the injected fragments as part of the query, breaking out of the intended logic. QNAP's advisory confirms the impact extends beyond data theft to execution of unauthorized code or commands.
The attack is performed over the network and requires low privileges. No user interaction is needed for exploitation, which broadens the threat from any compromised low-privilege account on a QNAP appliance exposing Qsync Central.
Root Cause
The root cause is improper neutralization of special characters in SQL statements constructed from user-controllable input. Qsync Central concatenates request parameters into queries instead of binding them as parameters, allowing attacker-controlled syntax to alter query structure.
Attack Vector
Exploitation requires network access to the Qsync Central management interface and valid user credentials. The attacker submits requests containing SQL metacharacters and crafted clauses to a vulnerable endpoint. The application appends the input to a backend SQL query, executing attacker-defined statements with the privileges of the Qsync Central database account.
Given QNAP's note that exploitation can lead to unauthorized code or command execution, the database role likely supports stacked queries or extension functions that allow operating system command execution on the NAS appliance.
No public proof-of-concept exploit is available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Refer to the QNAP Security Advisory QSA-25-10 for vendor technical details.
Detection Methods for CVE-2025-29892
Indicators of Compromise
- Unexpected SQL syntax fragments such as UNION SELECT, --, ;, or OR 1=1 in Qsync Central HTTP request logs
- Anomalous database queries or errors logged by Qsync Central referencing unexpected tables or columns
- New or modified administrator accounts within Qsync Central not created through standard provisioning
- Outbound connections from the QNAP NAS to unrecognized hosts following authenticated Qsync Central sessions
Detection Strategies
- Inspect Qsync Central web access logs for request parameters containing SQL keywords and metacharacters
- Correlate authenticated user sessions with subsequent database errors or unusually large response payloads
- Hunt for process execution on the NAS spawned by Qsync Central or its database service outside normal operational baselines
Monitoring Recommendations
- Forward QNAP NAS system logs and Qsync Central application logs to a centralized log platform for retention and analysis
- Alert on repeated failed login attempts followed by anomalous request patterns against the Qsync Central interface
- Monitor file integrity on Qsync Central installation directories and database files for unauthorized modification
How to Mitigate CVE-2025-29892
Immediate Actions Required
- Upgrade Qsync Central to version 4.5.0.6 or later, released 2025/03/20
- Restrict network exposure of QNAP NAS administrative interfaces to trusted management networks only
- Audit Qsync Central user accounts and revoke unused or excessive privileges
- Rotate credentials for all Qsync Central users following the upgrade to invalidate any previously stolen sessions
Patch Information
QNAP released a fixed build in Qsync Central 4.5.0.6 on 2025/03/20. Administrators should install the update through the QNAP App Center on affected NAS devices. Full remediation details are published in the QNAP Security Advisory QSA-25-10.
Workarounds
- Disable Qsync Central on affected NAS devices until the patched version is installed
- Place the QNAP appliance behind a VPN or firewall rule set that limits access to authenticated administrators
- Enforce strong, unique passwords and multi-factor authentication for all QNAP user accounts to reduce the risk of credential compromise that precedes exploitation
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
