CVE-2024-50389: QNAP QuRouter SQL Injection Vulnerability

CVE-2024-50389 Overview

A critical SQL injection vulnerability has been identified in QNAP QuRouter, the firmware powering QNAP's line of network routers. This vulnerability allows remote attackers to inject malicious SQL code into the application, potentially leading to unauthorized data access, data manipulation, and remote code execution on affected devices.

SQL injection vulnerabilities in network infrastructure devices like routers are particularly dangerous as they often serve as the gateway to internal networks. Successful exploitation could allow attackers to bypass authentication, extract sensitive configuration data, modify router settings, or pivot to attack other devices on the network.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to inject malicious code into QNAP QuRouter devices, potentially compromising network security and enabling unauthorized access to connected systems.

Affected Products

• QNAP QuRouter 2.4.0.190 (build 20240522)
• QNAP QuRouter 2.4.1.172 (build 20240606)
• QNAP QuRouter 2.4.1.634 (build 20240710)
• QNAP QuRouter 2.4.2.317 (build 20240903)
• QNAP QuRouter 2.4.2.538 (build 20240923)
• QNAP QuRouter 2.4.3.103 (build 20241011)
• QNAP QuRouter 2.4.4.106 (build 20241017)

Discovery Timeline

• 2024-12-06 - CVE-2024-50389 published to NVD
• 2025-09-24 - Last updated in NVD database

Technical Details for CVE-2024-50389

Vulnerability Analysis

CVE-2024-50389 is classified under CWE-89 (SQL Injection), indicating that the QuRouter firmware fails to properly sanitize user-supplied input before incorporating it into SQL queries. This fundamental input validation failure allows attackers to manipulate database queries by injecting specially crafted SQL statements through vulnerable parameters.

The vulnerability is network-accessible without requiring authentication or user interaction, making it particularly dangerous for internet-exposed QuRouter devices. Successful exploitation can result in complete compromise of confidentiality, integrity, and availability of the affected system, with potential for downstream impact on connected network infrastructure.

Router firmware vulnerabilities present elevated risk because these devices typically operate with elevated privileges and serve as network chokepoints. An attacker who gains control of a router can intercept traffic, redirect DNS queries, create persistent backdoors, or launch attacks against internal network resources.

Root Cause

The root cause of this vulnerability is improper input validation and sanitization in the QuRouter web management interface or API endpoints. User-controlled input is directly concatenated into SQL query strings without proper parameterization or escaping, allowing attackers to break out of the intended query context and execute arbitrary SQL commands.

This type of vulnerability typically occurs when developers use string concatenation to build SQL queries rather than using parameterized queries or prepared statements. The lack of input validation allows special SQL characters and keywords to be interpreted as part of the query structure rather than as literal data values.

Attack Vector

The attack vector for CVE-2024-50389 is network-based, meaning exploitation can be performed remotely over the network. Attackers can target vulnerable QuRouter devices by sending specially crafted HTTP requests containing malicious SQL payloads to the router's management interface.

The attack does not require prior authentication or user interaction, significantly lowering the barrier for exploitation. Attackers could potentially chain this vulnerability with other techniques to achieve complete device compromise, including extracting administrator credentials, modifying firewall rules, or implanting persistent backdoors in the router configuration.

Typical SQL injection attack techniques that may be applicable include:

• UNION-based injection: Extracting data from other database tables by appending UNION SELECT statements
• Blind SQL injection: Inferring database contents through boolean-based or time-based response analysis
• Stacked queries: Executing multiple SQL statements to modify or delete data
• Error-based injection: Extracting information through database error messages

Detection Methods for CVE-2024-50389

Indicators of Compromise

• Unusual SQL error messages in QuRouter logs or web interface responses
• Unexpected database query patterns or malformed requests in network traffic
• Authentication anomalies or unauthorized configuration changes on the router
• Presence of unexpected user accounts or modified access control settings

Detection Strategies

• Monitor network traffic to QuRouter devices for HTTP requests containing SQL injection patterns such as ' OR 1=1, UNION SELECT, --, or ;DROP
• Implement web application firewall (WAF) rules to detect and block common SQL injection payloads targeting router management interfaces
• Review QuRouter access logs for suspicious request patterns, especially requests with unusually long parameters or special characters
• Deploy network-based intrusion detection signatures for SQL injection attacks targeting QNAP devices

Monitoring Recommendations

• Enable verbose logging on QuRouter devices and forward logs to a centralized SIEM for analysis
• Implement alerting for failed authentication attempts and configuration changes on network infrastructure
• Conduct regular vulnerability scans of network devices to identify unpatched systems
• Monitor for unexpected outbound connections from router devices that could indicate compromise

How to Mitigate CVE-2024-50389

Immediate Actions Required

• Update all QNAP QuRouter devices to version 2.4.5.032 or later immediately
• Restrict access to the QuRouter management interface to trusted IP addresses only
• Disable remote management access if not required for operational purposes
• Audit router configurations for any unauthorized changes that may indicate prior exploitation

Patch Information

QNAP has released a security patch addressing this vulnerability in QuRouter version 2.4.5.032 and later. Organizations should apply this update as soon as possible through the QuRouter web management interface or QNAP's QTS/QuTS application center.

For detailed patch information and download instructions, refer to the QNAP Security Advisory QSA-24-45.

Workarounds

• Implement network segmentation to isolate QuRouter management interfaces from untrusted networks
• Configure firewall rules to restrict access to the router's web management port (typically 443 or 8080) from only authorized administrator IP addresses
• Enable two-factor authentication if available on the QuRouter platform
• Consider placing a web application firewall in front of the router management interface to filter malicious requests

# Example: Restrict management access via firewall rules
# Block external access to QuRouter management port
iptables -A INPUT -p tcp --dport 443 -s ! 192.168.1.0/24 -j DROP
iptables -A INPUT -p tcp --dport 8080 -s ! 192.168.1.0/24 -j DROP