CVE-2024-50387: QNAP SMB Service SQL Injection Vulnerability

CVE-2024-50387 Overview

A SQL injection vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow remote attackers to inject malicious code into affected QNAP SMB Service deployments. This critical vulnerability enables unauthenticated attackers to manipulate database queries through specially crafted input, potentially leading to data exfiltration, data modification, or complete system compromise.

Critical Impact

This SQL injection vulnerability allows remote attackers to inject malicious code without authentication, potentially compromising data confidentiality, integrity, and availability across affected QNAP NAS devices.

Affected Products

• QNAP SMB Service versions prior to 4.15.002
• QNAP SMB Service versions prior to h4.15.002
• QNAP SMB Service 4.15.001
• QNAP SMB Service h4.15.001

Discovery Timeline

• December 6, 2024 - CVE-2024-50387 published to NVD
• December 8, 2025 - Last updated in NVD database

Technical Details for CVE-2024-50387

Vulnerability Analysis

This vulnerability is classified as CWE-89 (Improper Neutralization of Special Elements used in an SQL Command), commonly known as SQL Injection. The flaw exists in QNAP's SMB Service component, which handles file sharing functionality on QNAP NAS devices. The vulnerability can be exploited remotely over the network without requiring authentication or user interaction.

The exploitation of this vulnerability could result in unauthorized access to sensitive data stored on the NAS, modification or deletion of database records, execution of administrative operations on the database, and potential lateral movement to other systems connected to the compromised NAS. Given that QNAP NAS devices typically store critical business and personal data, successful exploitation poses significant risks to data confidentiality and integrity.

Root Cause

The root cause of CVE-2024-50387 lies in insufficient input validation and sanitization within the SMB Service component. User-supplied input is incorporated into SQL queries without proper escaping or parameterization, allowing attackers to manipulate the query structure. This failure to properly neutralize special characters used in SQL syntax enables malicious actors to inject arbitrary SQL commands that execute with the privileges of the database service.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no authentication or user interaction. An attacker can exploit this vulnerability by sending specially crafted requests to the SMB Service. The malicious payload would contain SQL meta-characters and commands that, when processed by the vulnerable service, are interpreted as part of the SQL query rather than as data.

The exploitation process typically involves identifying injection points in the SMB Service interface, crafting SQL payloads that manipulate query logic, and leveraging the injected commands to extract data, modify records, or potentially execute system commands depending on database configuration and privileges.

Detection Methods for CVE-2024-50387

Indicators of Compromise

• Unusual database queries containing SQL keywords in unexpected fields (UNION, SELECT, INSERT, DROP, etc.)
• Anomalous network traffic patterns to QNAP NAS devices on SMB ports
• Unexpected database errors or timeouts in SMB Service logs
• Evidence of data exfiltration or unauthorized data access on QNAP devices

Detection Strategies

• Monitor SMB Service logs for suspicious query patterns or SQL syntax in user-controllable fields
• Implement network intrusion detection rules to identify SQL injection attack signatures targeting QNAP devices
• Deploy web application firewall (WAF) rules to filter common SQL injection payloads
• Audit database access logs for unauthorized queries or abnormal query volumes

Monitoring Recommendations

• Enable verbose logging on QNAP NAS devices to capture detailed SMB Service activity
• Configure SIEM alerts for SQL injection indicator patterns targeting NAS infrastructure
• Monitor for unexpected outbound connections from QNAP devices that may indicate data exfiltration
• Regularly review database query logs for anomalous patterns

How to Mitigate CVE-2024-50387

Immediate Actions Required

• Update QNAP SMB Service to version 4.15.002 or later immediately
• For h-series versions, update to SMB Service h4.15.002 or later
• Restrict network access to QNAP NAS devices from untrusted networks
• Review audit logs for any signs of prior exploitation

Patch Information

QNAP has released security patches addressing this vulnerability. The fixed versions are:

• SMB Service 4.15.002 and later
• SMB Service h4.15.002 and later

Administrators should apply these updates immediately through the QNAP App Center or by downloading the latest firmware from QNAP's official website. For detailed patch information, refer to the QNAP Security Advisory QSA-24-42.

Workarounds

• Implement network segmentation to isolate QNAP NAS devices from untrusted network segments
• Configure firewall rules to restrict SMB Service access to trusted IP addresses only
• Disable SMB Service if not required for business operations until patching is completed
• Consider deploying a reverse proxy with SQL injection filtering capabilities in front of QNAP services

# Example: Restrict SMB access via firewall (adjust IP ranges as needed)
# Block external access to SMB ports on QNAP device
iptables -A INPUT -p tcp --dport 445 -s ! 192.168.1.0/24 -j DROP
iptables -A INPUT -p tcp --dport 139 -s ! 192.168.1.0/24 -j DROP