CVE-2025-8250: Exam Form Submission SQL Injection Flaw

CVE-2025-8250 Overview

A critical SQL injection vulnerability has been identified in code-projects Exam Form Submission version 1.0. The vulnerability exists in the /admin/update_s4.php file, where improper handling of the credits parameter allows attackers to inject malicious SQL commands. This flaw enables remote attackers to manipulate database queries without authentication, potentially leading to unauthorized data access, data modification, or complete database compromise.

Critical Impact

Remote attackers can exploit the SQL injection vulnerability in the credits parameter to bypass authentication, extract sensitive data, modify database records, or potentially gain full control over the underlying database server.

Affected Products

• code-projects Exam Form Submission 1.0

Discovery Timeline

• 2025-07-28 - CVE-2025-8250 published to NVD
• 2025-07-30 - Last updated in NVD database

Technical Details for CVE-2025-8250

Vulnerability Analysis

This SQL injection vulnerability affects the administrative functionality of the Exam Form Submission application. The vulnerable endpoint /admin/update_s4.php processes the credits parameter without proper input validation or parameterized queries. When user-supplied input is directly concatenated into SQL statements, attackers can inject arbitrary SQL code that gets executed by the database engine.

The network-accessible nature of this vulnerability means attackers do not require local access to the target system. No authentication or user interaction is needed to exploit this flaw, making it particularly dangerous for publicly exposed instances of this application.

Root Cause

The root cause of this vulnerability is improper input validation and the lack of parameterized queries in the /admin/update_s4.php file. The application directly incorporates user-controlled data from the credits parameter into SQL queries without sanitization, escaping, or use of prepared statements. This represents a classic CWE-74 (Injection) vulnerability pattern where the application fails to properly neutralize special elements used in SQL commands.

Attack Vector

The attack can be launched remotely over the network by sending crafted HTTP requests to the vulnerable /admin/update_s4.php endpoint. An attacker would manipulate the credits parameter by injecting SQL metacharacters and malicious SQL statements. Depending on the database configuration and application privileges, successful exploitation could allow attackers to:

• Extract sensitive information from the database including student records and credentials
• Modify or delete database entries
• Bypass authentication mechanisms
• Potentially execute operating system commands if database permissions allow

The exploit has been publicly disclosed, increasing the risk of active exploitation attempts against vulnerable installations. For detailed technical information about this vulnerability, refer to the GitHub CVE Issue Discussion and VulDB #317838.

Detection Methods for CVE-2025-8250

Indicators of Compromise

• Unusual or malformed HTTP requests targeting /admin/update_s4.php with SQL metacharacters in the credits parameter
• Web server logs containing SQL injection patterns such as single quotes, UNION SELECT statements, or comment sequences in request parameters
• Database error messages exposed in application responses indicating failed injection attempts
• Unexpected database queries or modifications to student records and credit values

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common SQL injection patterns targeting the credits parameter
• Implement database activity monitoring to identify anomalous queries originating from the web application
• Enable detailed logging on the web server and configure alerts for requests to /admin/update_s4.php containing suspicious characters
• Use intrusion detection systems (IDS) with SQL injection signature rules

Monitoring Recommendations

• Monitor web application logs for repeated requests to /admin/update_s4.php from single IP addresses
• Track database query patterns for unexpected UNION, SELECT, or information_schema queries
• Alert on HTTP 500 errors from the vulnerable endpoint that may indicate injection attempts
• Review authentication logs for unusual admin access patterns following exploitation attempts

How to Mitigate CVE-2025-8250

Immediate Actions Required

• Restrict network access to the administrative interface /admin/ to trusted IP addresses only
• Implement a Web Application Firewall with SQL injection protection rules
• Consider taking the vulnerable application offline until a proper fix can be implemented
• Audit database logs for any signs of prior exploitation or unauthorized data access

Patch Information

No official vendor patch has been identified for this vulnerability at the time of publication. The application vendor, code-projects, has not released a security advisory addressing this issue. Organizations using code-projects Exam Form Submission 1.0 should implement the workarounds below and monitor for vendor updates through the Code Projects Resource Hub.

Workarounds

• Implement input validation on the credits parameter to allow only expected numeric values
• Use prepared statements or parameterized queries when interacting with the database
• Deploy network-level access controls to limit exposure of the administrative interface
• Consider using a reverse proxy with SQL injection filtering capabilities

To implement basic input validation for the credits parameter, ensure your application sanitizes input before processing:

# Example: Configure Apache mod_security rule to block SQL injection attempts
# Add to your Apache configuration or .htaccess file
SecRule ARGS:credits "@detectSQLi" "id:1001,phase:2,deny,status:403,msg:'SQL Injection Attempt Blocked'"

# Alternatively, restrict access to admin directory by IP
<Directory /var/www/html/admin>
    Require ip 192.168.1.0/24
    Require ip 10.0.0.0/8
</Directory>