CVE-2025-6835: Library System SQL Injection Vulnerability

CVE-2025-6835 Overview

A critical SQL Injection vulnerability has been identified in Code-projects Library System version 1.0. The vulnerability exists in the /student-issue-book.php file, where insufficient input validation of the reg parameter allows attackers to inject malicious SQL queries. This flaw enables unauthorized database access and manipulation through remotely initiated attacks. The exploit has been publicly disclosed, increasing the risk of active exploitation.

Critical Impact

Remote attackers can exploit this SQL Injection vulnerability to access, modify, or delete sensitive data in the library system database, potentially compromising student records and library management data.

Affected Products

• Code-projects Library System 1.0

Discovery Timeline

• 2025-06-29 - CVE-2025-6835 published to NVD
• 2025-07-01 - Last updated in NVD database

Technical Details for CVE-2025-6835

Vulnerability Analysis

This vulnerability represents a classic SQL Injection flaw (CWE-89) resulting from improper neutralization of special elements used in SQL commands. The vulnerable endpoint /student-issue-book.php processes the reg parameter without proper sanitization, allowing attackers to manipulate database queries. Due to the network-accessible nature of web applications, exploitation requires no authentication or special privileges, making it particularly dangerous for internet-facing deployments.

The broader classification under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component) indicates that user-supplied input is being incorporated directly into SQL statements without proper encoding or parameterization.

Root Cause

The root cause stems from inadequate input validation and the absence of parameterized queries or prepared statements when processing the reg parameter. The application directly concatenates user input into SQL queries, allowing malicious SQL syntax to alter the intended query logic. This is a fundamental secure coding violation that enables injection attacks.

Attack Vector

The attack can be initiated remotely over the network without requiring authentication. An attacker can craft malicious HTTP requests containing SQL injection payloads in the reg parameter of the /student-issue-book.php endpoint. Successful exploitation could allow the attacker to:

• Extract sensitive data from the database including student records
• Modify or delete database entries
• Bypass authentication mechanisms
• Potentially escalate to remote code execution depending on database configuration

The vulnerability has been publicly disclosed with technical details available through the GitHub CVE Issue Discussion, which increases the likelihood of exploitation attempts.

Detection Methods for CVE-2025-6835

Indicators of Compromise

• Unusual SQL error messages in web server logs originating from /student-issue-book.php
• Requests containing SQL syntax characters such as single quotes, semicolons, or UNION keywords in the reg parameter
• Abnormal database query patterns including time-based delays or error-based extraction attempts
• Unexpected data modifications or access to student records

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns targeting the reg parameter
• Configure intrusion detection systems to alert on requests containing common SQL injection payloads
• Enable detailed logging for the /student-issue-book.php endpoint and monitor for suspicious input patterns
• Deploy database activity monitoring to identify anomalous query execution

Monitoring Recommendations

• Review web server access logs for requests to /student-issue-book.php with encoded or suspicious reg parameter values
• Monitor database logs for failed queries, syntax errors, or unusual SELECT statements
• Set up alerts for multiple rapid requests to the vulnerable endpoint from single IP addresses
• Implement rate limiting on the affected endpoint to slow automated exploitation attempts

How to Mitigate CVE-2025-6835

Immediate Actions Required

• Restrict network access to the Library System application to trusted networks only
• Implement input validation on the reg parameter to allow only expected alphanumeric patterns
• Deploy a Web Application Firewall with SQL injection protection rules in front of the application
• Consider taking the application offline if it contains sensitive data until a permanent fix is implemented

Patch Information

No official patch or vendor advisory is currently available from Code-projects for this vulnerability. Organizations using this software should monitor the Code Projects Resource for security updates. Additional technical details are available through VulDB #314279.

Workarounds

• Implement prepared statements or parameterized queries in the application code for all database interactions
• Apply strict input validation using allowlist patterns for the reg parameter
• Use a WAF to filter requests containing SQL injection patterns before they reach the application
• Implement least-privilege database access so the application account has minimal permissions

# Example WAF rule concept for Apache ModSecurity
# Block SQL injection attempts on the reg parameter
SecRule ARGS:reg "@detectSQLi" \
    "id:100001,\
    phase:2,\
    deny,\
    status:403,\
    msg:'SQL Injection attempt detected in reg parameter',\
    log,\
    auditlog"