CVE-2025-6903: Anisha Car Rental System SQLi Vulnerability

CVE-2025-6903 Overview

A critical SQL injection vulnerability has been identified in Code-Projects Car Rental System version 1.0. This vulnerability exists within the /admin/approve.php file, where improper handling of the ID argument allows attackers to inject malicious SQL commands. The flaw can be exploited remotely without authentication, potentially enabling unauthorized access to sensitive database information, data manipulation, or complete system compromise.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to bypass authentication, extract sensitive data, modify database contents, or potentially gain unauthorized administrative access to the Car Rental System application.

Affected Products

• Anisha Car Rental System 1.0
• Code-Projects Car Rental System /admin/approve.php endpoint

Discovery Timeline

• 2025-06-30 - CVE-2025-6903 published to NVD
• 2025-07-11 - Last updated in NVD database

Technical Details for CVE-2025-6903

Vulnerability Analysis

This SQL injection vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) affects the administrative approval functionality within the Car Rental System application. The vulnerable endpoint at /admin/approve.php fails to properly sanitize user-supplied input through the ID parameter before incorporating it into SQL queries.

The vulnerability can be exploited remotely over the network with low attack complexity. No special privileges or user interaction are required to launch an attack, making this a significant security risk for any deployment of this application. The exploit has been publicly disclosed, increasing the likelihood of active exploitation attempts against vulnerable installations.

Root Cause

The root cause of this vulnerability is insufficient input validation and the absence of parameterized queries in the /admin/approve.php file. The application directly concatenates user-controlled input from the ID parameter into SQL statements without proper sanitization or escaping, allowing attackers to inject arbitrary SQL code.

Attack Vector

The attack vector is network-based, allowing remote exploitation. An attacker can craft malicious HTTP requests to the /admin/approve.php endpoint with specially crafted values in the ID parameter. These malicious inputs can modify the intended SQL query logic to:

• Extract sensitive information from the database (data exfiltration)
• Bypass authentication mechanisms
• Modify or delete database records
• Potentially execute administrative operations

The vulnerability manifests when the application processes the ID parameter without proper validation. Attackers can inject SQL syntax such as single quotes, UNION statements, or boolean-based payloads to manipulate query execution. For detailed technical information, refer to the GitHub CVE Issue Tracker and VulDB #314395.

Detection Methods for CVE-2025-6903

Indicators of Compromise

• Unusual HTTP requests to /admin/approve.php containing SQL injection patterns in the ID parameter
• Database error messages in application logs indicating malformed SQL queries
• Unexpected database access patterns or queries containing UNION, OR, AND operators with suspicious payloads
• Evidence of data extraction or unauthorized administrative actions in system logs

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns targeting the ID parameter
• Monitor access logs for requests to /admin/approve.php with encoded characters, single quotes, or SQL keywords
• Deploy database activity monitoring to identify anomalous query patterns or unauthorized data access
• Enable verbose logging on the application to capture suspicious parameter values

Monitoring Recommendations

• Configure alerting for any requests to administrative endpoints containing potential SQL injection payloads
• Implement real-time database query monitoring to detect injection attempts
• Establish baseline traffic patterns for /admin/approve.php and alert on deviations
• Review application and database logs regularly for evidence of exploitation attempts

How to Mitigate CVE-2025-6903

Immediate Actions Required

• Restrict network access to the Car Rental System administrative interface (/admin/) to trusted IP addresses only
• Deploy a Web Application Firewall with SQL injection protection rules in front of the application
• Consider temporarily disabling the /admin/approve.php functionality until a proper fix can be implemented
• Review database access logs for evidence of prior exploitation

Patch Information

As of the last update on 2025-07-11, no official vendor patch has been released for this vulnerability. Organizations using Code-Projects Car Rental System 1.0 should implement the workarounds below and monitor for vendor updates. For additional technical details, consult the VulDB CTI ID #314395 or the Code Projects Resource Hub.

Workarounds

• Implement prepared statements or parameterized queries for all database interactions involving user input
• Add strict input validation to whitelist only numeric values for the ID parameter
• Deploy network-level access controls to limit administrative interface exposure
• Apply defense-in-depth measures including database user privilege restrictions

# Example: Restrict access to admin directory via Apache configuration
<Directory "/var/www/html/admin">
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from 10.0.0.0/8
</Directory>