CVE-2025-9592: Apartment Management System SQLi Flaw

CVE-2025-9592 Overview

A SQL Injection vulnerability has been identified in itsourcecode Apartment Management System 1.0. This vulnerability affects the file /report/bill_info.php, where improper handling of the vid argument enables attackers to inject malicious SQL statements. The vulnerability can be exploited remotely without authentication, allowing attackers to manipulate database queries and potentially access, modify, or delete sensitive data stored in the application's database.

Critical Impact

Remote attackers can exploit this SQL Injection vulnerability to bypass authentication, extract sensitive tenant and billing information, or compromise the integrity of the apartment management database.

Affected Products

• Admerc Apartment Management System 1.0
• itsourcecode Apartment Management System 1.0

Discovery Timeline

• 2025-08-28 - CVE-2025-9592 published to NVD
• 2025-09-03 - Last updated in NVD database

Technical Details for CVE-2025-9592

Vulnerability Analysis

This SQL Injection vulnerability exists due to insufficient input validation and sanitization in the bill_info.php file within the Apartment Management System. The application fails to properly validate or parameterize user-supplied input passed through the vid argument before incorporating it into SQL queries. This allows attackers to inject arbitrary SQL code that is executed by the database engine with the privileges of the application's database user.

The vulnerability is classified under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), specifically manifesting as a classic SQL Injection attack vector. Since the exploit has been made public, the risk of exploitation in production environments is elevated.

Root Cause

The root cause of this vulnerability is the direct incorporation of user-controlled input from the vid parameter into SQL queries without proper sanitization, parameterization, or use of prepared statements. The application trusts user input and concatenates it directly into database queries, allowing malicious SQL syntax to be interpreted and executed by the database management system.

Attack Vector

The attack can be conducted remotely over the network without any authentication requirements. An attacker can craft malicious HTTP requests targeting the /report/bill_info.php endpoint with a specially crafted vid parameter containing SQL injection payloads. Since no user interaction is required and the attack complexity is low, exploitation is straightforward for attackers with basic SQL injection knowledge.

The vulnerability enables attackers to perform various SQL injection techniques including:

• UNION-based injection to extract data from other database tables
• Boolean-based blind injection to infer database contents
• Time-based blind injection for data extraction when direct output is not visible
• Potential for authentication bypass if the endpoint is related to user management

For detailed technical analysis and exploitation details, refer to the GitHub Issue #3 Discussion and VulDB CVE Analysis #321766.

Detection Methods for CVE-2025-9592

Indicators of Compromise

• Unusual SQL syntax or special characters (single quotes, double dashes, UNION statements) appearing in web server access logs for /report/bill_info.php
• Abnormal database query patterns or errors logged by the database server
• Unexpected data extraction or modifications in tenant billing records
• Spike in requests to the bill_info.php endpoint with varying vid parameter values

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns in the vid parameter
• Implement SQL injection detection signatures in intrusion detection/prevention systems (IDS/IPS)
• Monitor application and database logs for SQL syntax errors or unexpected query structures
• Configure database activity monitoring to alert on unusual SELECT, UNION, or data extraction operations

Monitoring Recommendations

• Enable detailed logging for the /report/bill_info.php endpoint to capture all incoming request parameters
• Set up alerts for database errors that may indicate injection attempts
• Monitor for bulk data access patterns that deviate from normal billing report generation behavior
• Implement rate limiting on the affected endpoint to slow down automated exploitation attempts

How to Mitigate CVE-2025-9592

Immediate Actions Required

• If possible, restrict access to the /report/bill_info.php endpoint until a patch is available
• Implement input validation to allow only numeric values for the vid parameter
• Deploy WAF rules specifically targeting SQL injection attempts on the vulnerable endpoint
• Consider taking the Apartment Management System offline if it contains sensitive data and cannot be adequately protected

Patch Information

As of the last update on 2025-09-03, no official patch has been released by the vendor. Organizations using itsourcecode Apartment Management System 1.0 should monitor the IT Source Code website for security updates. Given that this is an open-source project available through itsourcecode, users may need to implement their own code-level fixes using prepared statements and parameterized queries.

For additional vulnerability details and community discussion, refer to VulDB #321766.

Workarounds

• Modify the source code to use prepared statements with parameterized queries for all database operations involving the vid parameter
• Implement server-side input validation to reject non-numeric values for the vid parameter before processing
• Deploy a reverse proxy or WAF in front of the application to filter malicious requests
• Restrict network access to the application to trusted IP addresses only until proper remediation is implemented
• Consider migrating to a more actively maintained apartment management solution if vendor support is unavailable

# Example: Apache mod_rewrite rules to block suspicious vid parameter values
# Add to .htaccess or Apache configuration

RewriteEngine On
RewriteCond %{QUERY_STRING} vid=.*['";\-\-] [NC,OR]
RewriteCond %{QUERY_STRING} vid=.*union [NC,OR]
RewriteCond %{QUERY_STRING} vid=.*select [NC]
RewriteRule ^report/bill_info\.php$ - [F,L]