CVE-2025-4034: Online Examination System SQLi Vulnerability

CVE-2025-4034 Overview

A critical SQL injection vulnerability has been identified in Projectworlds Online Examination System version 1.0. This vulnerability affects the /inser_doc_process.php file, where improper handling of the Doc_ID argument allows attackers to inject malicious SQL queries. The vulnerability can be exploited remotely without authentication, potentially enabling unauthorized access to the underlying database, data exfiltration, and manipulation of examination records.

Critical Impact

Unauthenticated attackers can remotely exploit this SQL injection vulnerability to compromise database integrity, access sensitive student and examination data, and potentially escalate attacks against the underlying server infrastructure.

Affected Products

• Projectworlds Online Examination System 1.0

Discovery Timeline

• April 28, 2025 - CVE-2025-4034 published to NVD
• May 10, 2025 - Last updated in NVD database

Technical Details for CVE-2025-4034

Vulnerability Analysis

This SQL injection vulnerability exists in the /inser_doc_process.php file of the Projectworlds Online Examination System. The application fails to properly sanitize user-supplied input passed through the Doc_ID parameter before incorporating it into SQL queries. This classic injection flaw allows attackers to manipulate database queries by injecting arbitrary SQL syntax.

The vulnerability is network-accessible and requires no authentication or user interaction to exploit, making it particularly dangerous for publicly exposed installations. Successful exploitation could allow attackers to read, modify, or delete database contents, bypass authentication mechanisms, or potentially achieve remote code execution depending on database configuration and privileges.

Root Cause

The root cause of this vulnerability is improper input validation and missing parameterized query implementation in the /inser_doc_process.php file. The Doc_ID parameter is directly concatenated into SQL statements without proper sanitization or use of prepared statements, creating a classic injection point that violates secure coding practices.

Attack Vector

The attack can be launched remotely over the network. An attacker can craft malicious HTTP requests containing SQL injection payloads in the Doc_ID parameter. Since the vulnerability requires no authentication and no user interaction, any network-accessible instance of the Online Examination System is at risk.

The exploit has been publicly disclosed, as documented in the GitHub Issue Report and VulDB entries. Attackers can leverage standard SQL injection techniques including UNION-based, error-based, blind, or time-based injection methods depending on the application's response behavior.

Detection Methods for CVE-2025-4034

Indicators of Compromise

• Unusual or malformed HTTP requests to /inser_doc_process.php containing SQL syntax characters such as single quotes, semicolons, or SQL keywords in the Doc_ID parameter
• Database error messages in application logs indicating SQL syntax errors
• Unexpected database queries or access patterns in database audit logs
• Evidence of data exfiltration or unauthorized database modifications

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns in requests targeting /inser_doc_process.php
• Monitor web server access logs for requests containing suspicious characters or SQL keywords in query parameters
• Implement database activity monitoring to detect anomalous query patterns or unauthorized data access
• Use intrusion detection systems (IDS) with signatures for SQL injection attack patterns

Monitoring Recommendations

• Enable verbose logging on the web application to capture all requests to the affected endpoint
• Configure database audit logging to track queries executed against sensitive tables
• Set up alerts for failed or malformed database queries that may indicate exploitation attempts
• Monitor for unusual outbound network traffic that could indicate data exfiltration

How to Mitigate CVE-2025-4034

Immediate Actions Required

• Remove or disable public access to the /inser_doc_process.php file until a patch is available
• Implement WAF rules to filter SQL injection attempts targeting the vulnerable endpoint
• Review database permissions and restrict the application's database user to minimum required privileges
• Audit database logs for evidence of prior exploitation attempts

Patch Information

No official vendor patch is currently available for this vulnerability. The affected software, Projectworlds Online Examination System 1.0, is an open-source project. Organizations using this software should monitor the VulDB advisory and vendor channels for patch releases. In the absence of an official fix, implementing the workarounds below is strongly recommended.

Workarounds

• Restrict network access to the application using firewall rules, limiting access to trusted IP addresses only
• Implement server-side input validation to sanitize the Doc_ID parameter, rejecting any non-numeric input
• Modify the vulnerable code to use prepared statements with parameterized queries for all database interactions
• Deploy a reverse proxy or WAF with SQL injection filtering capabilities in front of the application
• Consider migrating to a more actively maintained examination system if vendor support is unavailable

# Example: Block access to vulnerable endpoint via .htaccess
# Add to .htaccess in the application root directory
<Files "inser_doc_process.php">
    Order Deny,Allow
    Deny from all
    # Optionally allow specific trusted IPs
    # Allow from 192.168.1.0/24
</Files>