CVE-2025-4363: Admerc Gym Management System SQLi Flaw

CVE-2025-4363 Overview

A SQL injection vulnerability has been identified in Admerc Gym Management System version 1.0. This vulnerability exists in the /ajax.php?action=end_membership endpoint, where the rid parameter is improperly handled, allowing attackers to inject malicious SQL queries. The vulnerability can be exploited remotely without authentication, potentially enabling unauthorized access to sensitive database information, data manipulation, or further compromise of the underlying system.

Critical Impact
Remote attackers can exploit this SQL injection vulnerability to extract sensitive membership data, modify database records, or potentially gain unauthorized access to the backend database server.

Affected Products

Admerc Gym Management System 1.0
admerc gym_management_system

Discovery Timeline

2025-05-06 - CVE-2025-4363 published to NVD
2025-12-19 - Last updated in NVD database

Technical Details for CVE-2025-4363

Vulnerability Analysis

This SQL injection vulnerability occurs when user-supplied input through the rid parameter is incorporated into SQL queries without proper sanitization or parameterization. The affected endpoint /ajax.php?action=end_membership processes membership termination requests but fails to validate the rid argument before including it in database operations.

The vulnerability is classified under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), which encompasses injection flaws where untrusted data is sent to an interpreter as part of a command or query. In this case, the application constructs SQL statements using user input directly, allowing an attacker to alter the intended query logic.

Root Cause

The root cause of this vulnerability is the lack of input validation and the use of unsanitized user input in SQL query construction. The rid parameter, intended to identify membership records for termination, is directly concatenated into SQL statements rather than being properly escaped or handled through prepared statements with parameterized queries.

Attack Vector

The attack can be initiated remotely over the network without requiring authentication. An attacker can craft malicious HTTP requests to the vulnerable endpoint, manipulating the rid parameter to inject arbitrary SQL commands. This could allow the attacker to:

Extract sensitive data from the database including member information, credentials, and financial records
Modify or delete existing database records
Bypass authentication mechanisms
Potentially execute system-level commands if database permissions allow

The vulnerability has been publicly disclosed with exploit information available through the GitHub Issue for CVE, increasing the risk of exploitation in the wild.

Detection Methods for CVE-2025-4363

Indicators of Compromise

Unusual SQL error messages in web server logs related to the /ajax.php endpoint
Suspicious requests to /ajax.php?action=end_membership containing SQL syntax characters such as single quotes, double dashes, or UNION keywords in the rid parameter
Unexpected database query patterns or execution times
Unauthorized data access or modifications in the gym management database

Detection Strategies

Implement Web Application Firewall (WAF) rules to detect SQL injection patterns in requests to the affected endpoint
Monitor application logs for requests containing SQL injection signatures such as ' OR 1=1, UNION SELECT, or comment sequences (--, #)
Deploy database activity monitoring to identify anomalous query patterns or unauthorized data access
Use intrusion detection systems (IDS) configured with SQL injection detection rules

Monitoring Recommendations

Enable detailed logging for the /ajax.php endpoint and review logs regularly for suspicious activity
Set up alerts for database errors or unexpected query execution patterns
Monitor network traffic for unusual outbound connections from the database server
Implement real-time alerting for multiple failed or malformed requests to the vulnerable endpoint

How to Mitigate CVE-2025-4363

Immediate Actions Required

Restrict access to the /ajax.php?action=end_membership endpoint using network-level controls or authentication requirements
Deploy a Web Application Firewall (WAF) with SQL injection protection rules
Consider taking the Gym Management System offline if it contains sensitive data until a patch is applied
Review database logs for signs of prior exploitation

Patch Information

No official vendor patch is currently available for this vulnerability. Administrators should monitor ITSourceCode for security updates. Additional vulnerability details can be found at VulDB #307487.

Workarounds

Implement input validation on the rid parameter to accept only numeric values
Use prepared statements with parameterized queries in the PHP code to prevent SQL injection
Apply the principle of least privilege to database accounts used by the application
Deploy network segmentation to isolate the web application from critical internal systems

bash

# Configuration example - Apache .htaccess to restrict access to vulnerable endpoint
<Files "ajax.php">
    # Restrict to trusted IP addresses only
    <RequireAll>
        Require ip 192.168.1.0/24
        Require ip 10.0.0.0/8
    </RequireAll>
</Files>