CVE-2025-4486: Gym Management System SQL Injection Flaw

CVE-2025-4486 Overview

A critical SQL injection vulnerability has been identified in itsourcecode Gym Management System version 1.0. This vulnerability exists in the /ajax.php?action=delete_plan endpoint where the ID parameter is improperly handled, allowing attackers to inject malicious SQL statements. The vulnerability can be exploited remotely without authentication, potentially enabling unauthorized access to the database, data exfiltration, or modification of sensitive gym member information.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to manipulate database queries, potentially leading to unauthorized data access, data modification, or complete database compromise in affected Gym Management System installations.

Affected Products

• Admerc Gym Management System 1.0
• itsourcecode Gym Management System 1.0

Discovery Timeline

• 2025-05-09 - CVE-2025-4486 published to NVD
• 2025-12-22 - Last updated in NVD database

Technical Details for CVE-2025-4486

Vulnerability Analysis

This SQL injection vulnerability affects the delete_plan action handler within the ajax.php file of the Gym Management System. The application fails to properly sanitize or parameterize the ID argument before incorporating it into SQL queries. This lack of input validation allows attackers to craft malicious requests that can alter the intended SQL query logic.

The vulnerability is remotely exploitable and requires no authentication, making it particularly dangerous for internet-facing installations. An attacker can leverage this flaw to extract sensitive data from the database, modify or delete records, or potentially escalate their attack to achieve broader system compromise depending on database permissions and configuration.

Root Cause

The root cause of CVE-2025-4486 is improper input validation (CWE-74: Injection) in the application's data processing logic. The ID parameter passed to the delete_plan action is directly concatenated into SQL queries without proper sanitization, parameterization, or use of prepared statements. This common coding error allows user-controlled input to break out of the intended SQL context and inject arbitrary SQL commands.

Attack Vector

The attack vector for this vulnerability is network-based, meaning attackers can exploit it remotely over HTTP/HTTPS connections. The exploitation flow involves:

1. An attacker identifies the vulnerable endpoint at /ajax.php?action=delete_plan
2. The attacker crafts a malicious HTTP request with SQL injection payloads in the ID parameter
3. The application incorporates the malicious input directly into a SQL query
4. The database executes the modified query, potentially returning unauthorized data or performing unintended operations

The vulnerability requires no user interaction and can be exploited by unauthenticated remote attackers. Successful exploitation can compromise the confidentiality, integrity, and availability of the database and its contents, including gym member personal information, payment details, and administrative credentials.

Detection Methods for CVE-2025-4486

Indicators of Compromise

• Unusual database queries containing SQL syntax in the ID parameter field in web server access logs
• Error messages in application logs indicating SQL syntax errors from malformed injection attempts
• Unexpected database modifications, deletions, or data exfiltration patterns
• Access log entries showing requests to /ajax.php?action=delete_plan with encoded special characters or SQL keywords

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block common SQL injection patterns targeting the ajax.php endpoint
• Configure intrusion detection systems (IDS) to monitor for SQL injection signatures in HTTP request parameters
• Review web server access logs for suspicious requests containing SQL keywords like UNION, SELECT, DROP, or comment sequences (--, /**/)
• Deploy database activity monitoring to detect anomalous query patterns or unauthorized data access

Monitoring Recommendations

• Enable detailed logging for all requests to the ajax.php endpoint and monitor for injection patterns
• Implement rate limiting on the affected endpoint to slow down automated exploitation attempts
• Set up alerting for database errors that may indicate SQL injection probing activity
• Monitor for any unauthorized changes to database records, particularly in plan-related tables

How to Mitigate CVE-2025-4486

Immediate Actions Required

• Restrict access to the /ajax.php?action=delete_plan endpoint using network-level controls or authentication requirements
• Implement input validation to reject non-numeric values in the ID parameter
• Deploy a web application firewall (WAF) with SQL injection protection rules
• Review application logs for evidence of prior exploitation attempts
• Consider taking the vulnerable application offline until a patch can be applied

Patch Information

No official vendor patch has been identified for this vulnerability at the time of publication. Organizations using itsourcecode Gym Management System 1.0 should contact the vendor for remediation guidance or consider implementing the workarounds below. Additional technical details can be found in the GitHub Issue Discussion and VulDB advisory.

Workarounds

• Modify the source code to use prepared statements or parameterized queries for the ID parameter in the delete_plan action
• Implement server-side input validation to ensure the ID parameter contains only numeric values
• Restrict network access to the Gym Management System to trusted IP ranges only
• Add authentication requirements to the ajax.php endpoint to prevent anonymous exploitation
• Consider deploying a reverse proxy with SQL injection filtering capabilities in front of the application

# Example: Apache .htaccess rule to restrict access to ajax.php
<Files "ajax.php">
    # Require authentication for ajax.php access
    AuthType Basic
    AuthName "Restricted Access"
    AuthUserFile /path/to/.htpasswd
    Require valid-user
    
    # Or restrict by IP address
    # Require ip 192.168.1.0/24
</Files>