CVE-2025-8328: Exam Form Submission SQLi Vulnerability

CVE-2025-8328 Overview

A critical SQL injection vulnerability has been identified in code-projects Exam Form Submission version 1.0. The vulnerability exists within the /register.php file, where the USN parameter is susceptible to SQL injection attacks due to improper input validation. This flaw allows remote attackers to manipulate database queries, potentially leading to unauthorized data access, data modification, or complete database compromise. The exploit has been publicly disclosed and other parameters within the application may also be affected.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to extract sensitive data, modify database records, or potentially gain unauthorized access to the underlying system through the publicly accessible /register.php endpoint.

Affected Products

• code-projects Exam Form Submission 1.0

Discovery Timeline

• 2025-07-30 - CVE-2025-8328 published to NVD
• 2025-08-05 - Last updated in NVD database

Technical Details for CVE-2025-8328

Vulnerability Analysis

This SQL injection vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) occurs in the registration functionality of the Exam Form Submission application. The /register.php endpoint fails to properly sanitize user-supplied input in the USN parameter before incorporating it into SQL queries. This allows attackers to inject malicious SQL commands that are executed by the database server.

The vulnerability is network-accessible, requiring no authentication or user interaction to exploit. While the immediate impact affects data confidentiality, integrity, and availability at a limited level, successful exploitation could allow attackers to enumerate database contents, bypass authentication mechanisms, or escalate to more severe attacks depending on the database configuration and privileges.

Root Cause

The root cause of this vulnerability is improper input validation in the /register.php file. The application directly incorporates the USN parameter value into SQL queries without proper sanitization, parameterized queries, or prepared statements. This classic SQL injection pattern allows user-controlled input to alter the intended SQL query structure.

The vulnerability likely stems from string concatenation used to build SQL queries, a common anti-pattern in legacy PHP applications. The absence of input validation, output encoding, or database abstraction layers exposes the application to injection attacks.

Attack Vector

The attack is executed remotely via network access to the web application. An attacker can craft malicious HTTP requests to the /register.php endpoint with specially crafted USN parameter values containing SQL injection payloads. No authentication or special privileges are required to reach the vulnerable endpoint.

Typical exploitation techniques include:

• Union-based injection: Appending UNION SELECT statements to extract data from other database tables
• Error-based injection: Triggering database errors that reveal table structure and data
• Boolean-based blind injection: Using conditional queries to extract data one bit at a time
• Time-based blind injection: Using database sleep functions to infer data through response delays

For detailed technical analysis and proof-of-concept information, refer to the GitHub CVE Issue Tracker and VulDB #318278.

Detection Methods for CVE-2025-8328

Indicators of Compromise

• Unusual or malformed requests to /register.php containing SQL syntax characters such as single quotes, double dashes, semicolons, or UNION keywords in the USN parameter
• Database error messages appearing in application logs or HTTP responses
• Unexpected database queries or query execution patterns in database audit logs
• Anomalous data access patterns or bulk data extraction from user-related tables

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection payloads targeting the USN parameter and /register.php endpoint
• Implement application-layer monitoring to alert on requests containing SQL injection signatures
• Enable database query logging and monitor for unusual query patterns, particularly those involving UNION, SELECT, or data extraction operations
• Use intrusion detection systems (IDS) configured with SQL injection signature rules

Monitoring Recommendations

• Monitor HTTP access logs for requests to /register.php with suspicious query string or POST body content
• Configure database audit logging to track all queries executed against sensitive tables
• Set up alerts for failed database queries or SQL syntax errors that may indicate injection attempts
• Implement real-time log correlation to identify patterns of reconnaissance or exploitation attempts

How to Mitigate CVE-2025-8328

Immediate Actions Required

• Restrict access to the /register.php endpoint via network segmentation or access control lists until a patch is applied
• Deploy WAF rules to block known SQL injection patterns on the affected endpoint
• Review and audit all user input parameters in the application for similar vulnerabilities
• Consider taking the application offline if it processes sensitive data and cannot be immediately patched

Patch Information

As of the last update, no official patch has been released by code-projects for this vulnerability. Organizations using this software should monitor the Code Projects website for security updates. In the absence of an official patch, organizations must implement defensive measures at the application and network layers to mitigate risk.

Workarounds

• Implement input validation to sanitize the USN parameter and reject requests containing SQL metacharacters
• Modify the application code to use parameterized queries or prepared statements for all database operations
• Deploy a reverse proxy with SQL injection filtering capabilities in front of the application
• Implement database user privilege restrictions to limit the impact of successful injection attacks
• Enable database connection pooling with read-only users for registration queries where write access is not required

Recommended defensive configuration for Apache with mod_security:

# ModSecurity rule to block SQL injection in USN parameter
SecRule ARGS:USN "@detectSQLi" \
    "id:1001,\
    phase:2,\
    deny,\
    status:403,\
    log,\
    msg:'SQL Injection attempt detected in USN parameter',\
    tag:'attack-sqli'"

# Block access to register.php from untrusted networks (example)
<Location /register.php>
    Require ip 192.168.1.0/24
</Location>