CVE-2025-59387: MARS SQL Injection Vulnerability

CVE-2025-59387 Overview

An SQL injection vulnerability has been identified in QNAP MARS (Multi-Application Recovery Service). This vulnerability allows remote attackers to exploit improper input validation to execute unauthorized code or commands on affected systems. The flaw exists in the application's database query handling, where user-supplied input is not properly sanitized before being incorporated into SQL statements.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to execute unauthorized code or commands, potentially leading to complete system compromise, data exfiltration, or denial of service.

Affected Products

• QNAP MARS (Multi-Application Recovery Service) versions prior to 1.2.1.1686

Discovery Timeline

• 2026-01-02 - CVE CVE-2025-59387 published to NVD
• 2026-01-02 - Last updated in NVD database

Technical Details for CVE-2025-59387

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 MARS application fails to properly sanitize user-controlled input before incorporating it into SQL queries, allowing attackers to inject malicious SQL commands.

SQL injection vulnerabilities in backup and recovery services like MARS are particularly dangerous because these applications typically have elevated database privileges needed for their recovery operations. An attacker exploiting this vulnerability could potentially access or modify backup configurations, retrieve sensitive backup data, or leverage the database access to pivot to other systems.

The network-accessible nature of this vulnerability means attackers do not require prior authentication or user interaction to exploit the flaw, making it an attractive target for opportunistic attacks against exposed QNAP devices.

Root Cause

The root cause of CVE-2025-59387 is improper input validation and inadequate sanitization of user-supplied data before its use in SQL queries. The MARS application constructs SQL statements using concatenation or improper parameterization, allowing specially crafted input to break out of the intended query context and execute arbitrary SQL commands.

Attack Vector

This vulnerability is exploitable over the network without requiring authentication or user interaction. An attacker can craft malicious requests containing SQL injection payloads and send them to the vulnerable MARS service. Upon processing these requests, the application executes the injected SQL commands with the privileges of the database user, potentially allowing:

• Extraction of sensitive data from the database
• Modification or deletion of backup configurations and data
• Execution of database administrative commands
• In some configurations, operating system command execution through database features

The vulnerability is accessible remotely, making internet-exposed QNAP devices with MARS installed particularly at risk.

Detection Methods for CVE-2025-59387

Indicators of Compromise

• Unusual SQL error messages in MARS application logs indicating malformed queries
• Unexpected database queries containing SQL keywords like UNION, SELECT, INSERT, DELETE, or DROP
• Anomalous network traffic patterns to MARS service endpoints with encoded special characters
• Evidence of data exfiltration from MARS database tables

Detection Strategies

• Monitor MARS application logs for SQL syntax errors or injection-related error patterns
• Deploy web application firewall (WAF) rules to detect common SQL injection payloads targeting MARS endpoints
• Implement network intrusion detection signatures for SQL injection attack patterns
• Review database audit logs for unauthorized queries or privilege escalation attempts

Monitoring Recommendations

• Enable verbose logging on MARS application and associated database services
• Configure alerts for failed or malformed SQL query attempts in database logs
• Monitor network traffic to QNAP devices for suspicious payload patterns
• Implement file integrity monitoring on MARS configuration and database files

How to Mitigate CVE-2025-59387

Immediate Actions Required

• Update MARS to version 1.2.1.1686 or later immediately
• Restrict network access to MARS service to trusted IP addresses only
• Review MARS and database logs for evidence of exploitation attempts
• Consider temporarily disabling the MARS service if patching is not immediately possible

Patch Information

QNAP has released a security update addressing this vulnerability. Users should upgrade MARS (Multi-Application Recovery Service) to version 1.2.1.1686 or later. The patch is available through the QNAP App Center or can be downloaded directly from QNAP's website. For detailed patch information and installation instructions, refer to the QNAP Security Advisory QSA-25-53.

Workarounds

• Implement network segmentation to limit access to MARS service endpoints from untrusted networks
• Deploy a web application firewall (WAF) with SQL injection protection rules in front of MARS
• Disable remote access to MARS if the feature is not required for operations
• Apply principle of least privilege to database accounts used by MARS

# Example: Restrict access to MARS port using iptables
iptables -A INPUT -p tcp --dport <MARS_PORT> -s <TRUSTED_IP_RANGE> -j ACCEPT
iptables -A INPUT -p tcp --dport <MARS_PORT> -j DROP