CVE-2024-50390: QNAP QuRouter RCE Vulnerability

CVE-2024-50390 Overview

A command injection vulnerability has been identified in QNAP QHora devices running the QuRouter firmware. This security flaw allows remote attackers to execute arbitrary commands on affected systems, potentially leading to complete device compromise. The vulnerability stems from improper input validation in the QuRouter firmware, enabling attackers to inject malicious commands through network-accessible interfaces.

Critical Impact

Remote attackers can execute arbitrary commands on vulnerable QNAP QHora devices, potentially gaining full control over network infrastructure and enabling lateral movement within enterprise environments.

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

• March 7, 2025 - CVE-2024-50390 published to NVD
• September 24, 2025 - Last updated in NVD database

Technical Details for CVE-2024-50390

Vulnerability Analysis

CVE-2024-50390 is classified as CWE-78: Improper Neutralization of Special Elements used in an OS Command (OS Command Injection). This vulnerability affects the QuRouter firmware on QNAP QHora devices, where user-supplied input is incorporated into operating system commands without adequate sanitization.

The attack requires network access with some user interaction involved. When successfully exploited, attackers can achieve high impact across confidentiality, integrity, and availability of the affected device. Given that QHora devices serve as network routers, a compromised device could provide attackers with a strategic foothold for intercepting network traffic, pivoting to internal systems, or establishing persistent access to the network infrastructure.

Root Cause

The vulnerability originates from insufficient input validation and sanitization within the QuRouter firmware. When processing user-supplied data through network-accessible interfaces, the firmware fails to properly neutralize special characters and command separators before passing input to shell commands. This allows attackers to break out of the intended command context and inject arbitrary operating system commands that execute with the privileges of the underlying service or process.

Attack Vector

The attack vector is network-based, meaning exploitation can occur remotely without requiring local access to the device. The attack involves some prerequisites (user interaction required) but does not require authentication. An attacker would craft malicious input containing shell metacharacters such as command separators (;, |, &&), command substitution patterns (`command` or $(command)), or input/output redirection operators. When this malicious input is processed by the vulnerable component, the injected commands are executed on the underlying operating system.

Since no verified proof-of-concept code is available for this vulnerability, administrators should refer to the QNAP Security Advisory QSA-25-01 for technical details and remediation guidance.

Detection Methods for CVE-2024-50390

Indicators of Compromise

• Unexpected outbound network connections from QHora devices to unknown external hosts
• Unusual process execution or shell activity on the device outside normal operational patterns
• Modifications to system configuration files or firmware settings
• Evidence of privilege escalation attempts or new user account creation on the device
• Anomalous log entries indicating command execution failures or syntax errors from injected payloads

Detection Strategies

• Monitor network traffic to and from QHora devices for suspicious patterns including unusual ports, protocols, or destinations
• Implement intrusion detection system (IDS) rules to detect common command injection patterns in HTTP requests targeting QNAP devices
• Review device logs regularly for authentication anomalies or unexpected administrative actions
• Deploy network segmentation to limit exposure and enable more targeted monitoring of management interfaces

Monitoring Recommendations

• Enable comprehensive logging on all QHora devices and forward logs to a centralized SIEM solution
• Configure alerts for any firmware changes, configuration modifications, or user account changes on network devices
• Establish baseline behavior for QHora devices and alert on deviations from normal traffic patterns
• Monitor for reconnaissance activity targeting QNAP device management interfaces

How to Mitigate CVE-2024-50390

Immediate Actions Required

• Update all affected QNAP QuRouter devices to version 2.4.5.032 or later immediately
• Restrict network access to device management interfaces using firewall rules or access control lists
• Disable remote management access from untrusted networks, particularly the public internet
• Conduct a security audit to determine if any QHora devices may have been compromised prior to patching

Patch Information

QNAP has addressed this vulnerability in QuRouter version 2.4.5.032 and later releases. Administrators should apply this update as soon as possible to remediate the command injection vulnerability. The official security advisory is available at the QNAP Security Advisory QSA-25-01 page, which provides detailed information about the fix and installation instructions.

Workarounds

• Implement strict network segmentation to isolate QHora devices from untrusted network segments
• Use a firewall or access control list to whitelist only trusted IP addresses for management access
• Disable any unnecessary services or remote access features on the device until patching is complete
• Consider placing vulnerable devices behind a VPN to limit exposure during the remediation window

# Example firewall rule to restrict management access (Linux-based network)
# Allow management access only from trusted admin subnet
iptables -A INPUT -p tcp --dport 443 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP