CVE-2024-1827: Library System SQL Injection Vulnerability

CVE-2024-1827 Overview

A critical SQL Injection vulnerability has been identified in code-projects Library System 1.0. This vulnerability exists in the file Source/librarian/user/teacher/login.php where improper handling of the username and password parameters allows attackers to inject malicious SQL commands. The attack can be initiated remotely without authentication, potentially allowing unauthorized access to the database, data exfiltration, or complete system compromise.

Critical Impact

This SQL Injection vulnerability enables unauthenticated remote attackers to bypass authentication, extract sensitive data, modify database contents, or potentially gain complete control over the underlying database server through the teacher login functionality.

Affected Products

• code-projects Library System 1.0

Discovery Timeline

• 2024-02-23 - CVE-2024-1827 published to NVD
• 2024-12-06 - Last updated in NVD database

Technical Details for CVE-2024-1827

Vulnerability Analysis

This SQL Injection vulnerability (CWE-89) occurs in the teacher login authentication mechanism of the Library System application. The vulnerability stems from the direct concatenation of user-supplied input into SQL queries without proper sanitization or parameterization. When a user submits login credentials through the login.php file, the username and password parameters are incorporated directly into the SQL query that authenticates users against the database.

The lack of input validation allows attackers to craft malicious input strings containing SQL syntax that alters the intended query logic. This can result in authentication bypass, unauthorized data access, data manipulation, or in severe cases, command execution on the database server depending on database configuration and privileges.

Root Cause

The root cause of this vulnerability is insufficient input validation and the failure to use parameterized queries (prepared statements) when handling user authentication. The login.php script directly incorporates user-controlled input from the username and password form fields into SQL statements, creating an injection point that attackers can exploit to manipulate database queries.

Attack Vector

The vulnerability is exploited remotely over the network by submitting specially crafted input to the teacher login form at Source/librarian/user/teacher/login.php. An attacker does not need any prior authentication or special privileges to exploit this vulnerability. By injecting SQL syntax into the username or password fields, an attacker can manipulate the authentication query to:

• Bypass authentication entirely by injecting conditions that always evaluate to true
• Extract sensitive information from the database using UNION-based or error-based injection techniques
• Modify or delete database records
• Potentially execute system commands if database permissions allow

The vulnerability has been publicly disclosed, and technical details are available through the GitHub SQL Injection Guide.

Detection Methods for CVE-2024-1827

Indicators of Compromise

• Unusual or malformed login attempts containing SQL syntax characters such as single quotes ('), double dashes (--), or OR 1=1 patterns in web server logs
• Unexpected database queries or errors logged by the database server
• Successful authentication events from unknown IP addresses or at unusual times
• Database audit logs showing unauthorized SELECT, INSERT, UPDATE, or DELETE operations

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns in POST requests to login.php
• Enable database query logging and monitor for anomalous or malformed queries
• Deploy intrusion detection systems (IDS) with signatures for common SQL injection attack patterns
• Implement application-level logging for failed authentication attempts and monitor for injection patterns

Monitoring Recommendations

• Monitor web server access logs for requests to /Source/librarian/user/teacher/login.php containing suspicious characters or SQL keywords
• Set up alerts for multiple failed login attempts followed by a successful login from the same source
• Establish baseline authentication patterns and alert on deviations
• Review database audit logs regularly for unauthorized data access or modifications

How to Mitigate CVE-2024-1827

Immediate Actions Required

• Restrict access to the Library System application to trusted networks only until a patch is applied
• Implement a Web Application Firewall (WAF) with SQL injection protection rules
• Review database user permissions and limit privileges to the minimum required
• Back up the database and audit for signs of compromise

Patch Information

No official vendor patch information is currently available for this vulnerability. System administrators should consider the following interim measures:

• Contact code-projects for patch availability or updated software versions
• Review the technical details available at VulDB #254615 for additional guidance
• Consider replacing the vulnerable authentication code with secure implementation using prepared statements

Workarounds

• Disable or restrict access to the teacher login functionality (login.php) until a proper fix can be implemented
• Deploy a reverse proxy or WAF with SQL injection filtering capabilities in front of the application
• Implement network-level access controls to limit who can reach the login page
• If source code access is available, modify the authentication code to use parameterized queries (prepared statements) instead of string concatenation

# Example: Block access to vulnerable endpoint using Apache .htaccess
# Add to .htaccess file in the application root
<Files "login.php">
    # Only allow specific IP ranges
    Require ip 192.168.1.0/24
    # Or deny all external access
    # Require all denied
</Files>