CVE-2025-6888: Teachers Record Management System SQLi

CVE-2025-6888 Overview

A critical SQL injection vulnerability has been identified in PHPGurukul Teachers Record Management System version 2.1. The vulnerability exists in the /admin/changeimage.php file, where the tid parameter is not properly sanitized before being used in database queries. This flaw allows remote attackers to inject malicious SQL statements, potentially leading to unauthorized data access, modification, or deletion within the application's database.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to bypass authentication, extract sensitive data including teacher records and credentials, modify database contents, or potentially gain administrative access to the system.

Affected Products

• PHPGurukul Teachers Record Management System version 2.1
• Systems running the vulnerable /admin/changeimage.php endpoint
• Web servers hosting unpatched installations of the Teachers Record Management System

Discovery Timeline

• June 30, 2025 - CVE-2025-6888 published to NVD
• July 8, 2025 - Last updated in NVD database

Technical Details for CVE-2025-6888

Vulnerability Analysis

This vulnerability is classified as CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), specifically manifesting as a SQL injection attack. The vulnerable component resides in the /admin/changeimage.php file, which handles teacher image update functionality within the administrative panel.

The application fails to implement proper input validation and parameterized queries when processing the tid (teacher ID) parameter. This allows an attacker to craft malicious input that escapes the intended SQL query context and executes arbitrary SQL commands against the underlying database.

Since the vulnerability is accessible via network-based requests and requires no authentication or user interaction, attackers can exploit this remotely with minimal effort. The exploit has been publicly disclosed, increasing the risk of active exploitation in the wild.

Root Cause

The root cause of this vulnerability is the direct incorporation of user-supplied input (the tid parameter) into SQL queries without proper sanitization, validation, or the use of prepared statements. PHP applications that concatenate user input directly into SQL strings are inherently vulnerable to injection attacks when special characters or SQL syntax are not escaped or filtered.

Attack Vector

The attack vector for CVE-2025-6888 is network-based, requiring an attacker to send crafted HTTP requests to the /admin/changeimage.php endpoint. By manipulating the tid parameter with SQL injection payloads, attackers can:

1. Extract sensitive information from the database through UNION-based or blind SQL injection techniques
2. Bypass authentication mechanisms by altering query logic
3. Modify or delete database records, potentially corrupting teacher data
4. In certain configurations, achieve command execution on the underlying server through SQL features like INTO OUTFILE or stored procedures

The vulnerability manifests when the application processes the tid parameter in database operations without proper input sanitization. Technical details and proof-of-concept information can be found in the GitHub Issue Discussion and VulDB entry #314367.

Detection Methods for CVE-2025-6888

Indicators of Compromise

• Anomalous HTTP requests to /admin/changeimage.php containing SQL syntax characters such as single quotes, semicolons, or SQL keywords (SELECT, UNION, INSERT, DELETE)
• Unexpected database errors or unusual response times from the changeimage.php endpoint
• Database logs showing malformed or unauthorized queries originating from the web application
• Evidence of data exfiltration or unauthorized database modifications in audit logs

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block SQL injection patterns targeting the tid parameter
• Monitor HTTP request logs for suspicious payloads containing SQL injection signatures
• Deploy intrusion detection systems (IDS) with rules specifically targeting SQL injection attempts against PHP applications
• Enable database query logging and alert on anomalous query patterns or errors

Monitoring Recommendations

• Set up real-time alerting for HTTP requests to /admin/changeimage.php with unusual parameter values
• Monitor database connection logs for queries with injection characteristics
• Implement file integrity monitoring on the Teachers Record Management System installation directory
• Review access logs regularly for reconnaissance patterns preceding exploitation attempts

How to Mitigate CVE-2025-6888

Immediate Actions Required

• Restrict network access to the /admin/changeimage.php endpoint to trusted IP addresses only
• Consider taking the affected system offline until a patch is available or workarounds are implemented
• Implement a web application firewall with SQL injection protection rules
• Audit the database for any signs of unauthorized access or data manipulation

Patch Information

At the time of publication, no official patch has been released by PHPGurukul for this vulnerability. System administrators should monitor the PHPGurukul website for security updates and apply patches immediately when available. Given the public disclosure of this exploit, prioritizing mitigation measures is essential.

Workarounds

• Implement input validation on the tid parameter to accept only numeric values
• Deploy a web application firewall (WAF) with SQL injection detection capabilities in front of the application
• Restrict access to the administrative panel using IP-based access controls or VPN requirements
• Consider implementing prepared statements or parameterized queries at the application code level if source code modification is possible
• Disable the vulnerable changeimage.php functionality temporarily if the feature is not critical to operations

# Example Apache .htaccess configuration to restrict admin access
<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>