CVE-2025-20620: STEALTHONE D220/D340 SQLi Vulnerability

CVE-2025-20620 Overview

A SQL Injection vulnerability exists in the STEALTHONE D220/D340 network-attached storage (NAS) devices manufactured by Y'S corporation. This vulnerability allows an attacker with network access to the affected product to exploit improper input validation and obtain the administrative password of the web management interface. Successful exploitation could lead to complete administrative control over the device, potentially exposing sensitive data and enabling further attacks within the network.

Critical Impact

Attackers can extract administrative credentials from the web management interface, enabling complete device takeover and unauthorized access to stored data.

Affected Products

• STEALTHONE D220 (prior to firmware version 6.03.03)
• STEALTHONE D340 (prior to firmware version 6.03.03)

Discovery Timeline

• 2025-01-14 - CVE-2025-20620 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-20620

Vulnerability Analysis

This vulnerability is classified as CWE-89 (SQL Injection), a critical web application security flaw that occurs when user-supplied data is incorporated into SQL queries without proper sanitization or parameterization. In the context of the STEALTHONE D220/D340 devices, the web management interface fails to adequately validate input parameters before passing them to backend database queries.

The attack surface is network-accessible, requiring no authentication or user interaction, which significantly increases the risk profile. An attacker can craft malicious SQL statements that, when processed by the vulnerable application, can bypass authentication mechanisms and directly extract sensitive information from the underlying database—including the administrative password for the web management console.

Root Cause

The root cause of CVE-2025-20620 is improper input validation in the web management interface of STEALTHONE D220/D340 devices. User-supplied data is directly concatenated into SQL queries without proper sanitization, prepared statements, or parameterized queries. This allows attackers to inject arbitrary SQL code that gets executed by the database engine with the same privileges as the application.

Attack Vector

The attack is conducted remotely over the network (AV:N) against the web management interface. The attacker does not require any prior authentication (PR:N), and no user interaction is needed (UI:N) for successful exploitation. The attack complexity is low (AC:L), meaning the attacker can reliably exploit the vulnerability without requiring special conditions.

A typical attack scenario involves:

1. The attacker identifies a STEALTHONE D220/D340 device with an accessible web management interface
2. The attacker crafts malicious SQL injection payloads targeting vulnerable input fields
3. The payload manipulates the SQL query to extract the administrative password from the database
4. With the admin password, the attacker gains full control over the device configuration and stored data

The vulnerability primarily impacts confidentiality (C:H), as it allows extraction of sensitive credential data, while integrity (I:N) and availability (A:N) are not directly affected by the SQL injection itself.

Detection Methods for CVE-2025-20620

Indicators of Compromise

• Unusual or malformed HTTP requests to the web management interface containing SQL syntax characters such as single quotes ('), double dashes (--), or UNION SELECT statements
• Database error messages appearing in HTTP responses that may indicate failed SQL injection attempts
• Unexpected authentication successes from unknown IP addresses accessing the admin interface
• Anomalous database query patterns or execution times in backend logs

Detection Strategies

• Deploy web application firewalls (WAF) with SQL injection detection rules to monitor and block malicious requests targeting the device's management interface
• Implement network intrusion detection systems (IDS) with signatures for common SQL injection patterns
• Enable detailed logging on the STEALTHONE devices and forward logs to a SIEM for centralized analysis
• Monitor for authentication events from unexpected source IPs or at unusual times

Monitoring Recommendations

• Establish baseline network traffic patterns to the management interface and alert on deviations
• Configure alerts for multiple failed login attempts followed by successful authentication
• Regularly review access logs for the web management interface for suspicious query strings
• Implement network segmentation to restrict management interface access to authorized administrative networks only

How to Mitigate CVE-2025-20620

Immediate Actions Required

• Update STEALTHONE D220/D340 devices to firmware version 6.03.03 or later, which addresses this SQL injection vulnerability
• Restrict network access to the web management interface using firewall rules or network segmentation
• Change administrative passwords immediately if there is any suspicion the device may have been compromised
• Review access logs for indicators of past exploitation attempts

Patch Information

Y'S corporation has released firmware version 6.03.03 for the STEALTHONE D220/D340 devices to address this vulnerability. Detailed patch information and firmware downloads are available from the StealthOne Product Information page. Additional vulnerability details can be found in the JVN Vulnerability Report.

Workarounds

• Isolate the management interface by placing STEALTHONE devices on a dedicated management VLAN accessible only to authorized administrators
• Implement IP address whitelisting to restrict access to the web management interface from trusted administrative workstations only
• Deploy a reverse proxy or web application firewall in front of the management interface with SQL injection filtering capabilities
• If the management interface is not required for daily operations, consider disabling remote web management until the firmware can be updated

# Example: Firewall rule to restrict management interface access (adapt to your environment)
# Allow management access only from trusted admin subnet
iptables -A INPUT -p tcp --dport 443 -s 10.0.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP