CVE-2024-37873: Payroll Management System SQLi Flaw

CVE-2024-37873 Overview

CVE-2024-37873 is a SQL injection vulnerability affecting the view_payslip.php file in Itsourcecode Payroll Management System Project In PHP With Source Code version 1.0. This vulnerability allows remote attackers to execute arbitrary SQL commands via the id parameter, potentially leading to complete database compromise, unauthorized data access, and system takeover.

Critical Impact

This SQL injection flaw enables unauthenticated remote attackers to execute arbitrary SQL commands, potentially exposing sensitive payroll data including employee salaries, personal information, and financial records stored in the database.

Affected Products

• Itsourcecode Payroll Management System Project In PHP With Source Code version 1.0
• PHP-based payroll management deployments using the vulnerable view_payslip.php component

Discovery Timeline

• 2024-07-09 - CVE-2024-37873 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-37873

Vulnerability Analysis

This SQL injection vulnerability exists in the view_payslip.php file of the Payroll Management System. The application fails to properly sanitize or parameterize user input passed through the id parameter before incorporating it into SQL queries. This classic input validation failure allows attackers to manipulate database queries by injecting malicious SQL syntax.

The vulnerability is particularly dangerous because it requires no authentication to exploit, can be triggered remotely over the network, and provides attackers with full control over database operations. Successful exploitation can lead to unauthorized access to sensitive payroll information, modification or deletion of database records, and in some configurations, execution of operating system commands through database functionality.

Root Cause

The root cause of CVE-2024-37873 is improper input validation (CWE-89: Improper Neutralization of Special Elements used in an SQL Command). The view_payslip.php script directly incorporates user-supplied input from the id parameter into SQL queries without proper sanitization, escaping, or the use of parameterized queries/prepared statements.

Attack Vector

The attack vector is network-based, requiring no user interaction or prior authentication. An attacker can craft malicious HTTP requests containing SQL injection payloads in the id parameter of the view_payslip.php endpoint. By manipulating this parameter with SQL syntax such as UNION-based queries, boolean-based blind injection, or time-based blind injection techniques, attackers can extract data, modify records, or potentially gain further system access.

The vulnerability can be exploited by sending a crafted GET or POST request to the view_payslip.php endpoint with a malicious id parameter value. For example, injecting SQL operators like single quotes, UNION SELECT statements, or OR-based conditions can alter the intended query logic. For detailed technical information, refer to the GitHub Issue Discussion documenting this vulnerability.

Detection Methods for CVE-2024-37873

Indicators of Compromise

• Unusual or malformed HTTP requests to view_payslip.php containing SQL syntax characters (single quotes, double dashes, UNION, SELECT, OR, AND)
• Database error messages appearing in application logs or HTTP responses indicating SQL syntax errors
• Unexpected database queries or access patterns in database audit logs
• Evidence of data exfiltration or unauthorized access to payroll records

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common SQL injection patterns in HTTP requests
• Monitor application logs for requests containing SQL injection indicators such as ', --, UNION, SELECT, OR 1=1, and similar patterns
• Enable database query logging and alert on anomalous query patterns or syntax errors
• Deploy intrusion detection systems (IDS) with SQL injection signature detection capabilities

Monitoring Recommendations

• Enable verbose logging on web servers for all requests to PHP endpoints, particularly view_payslip.php
• Configure database audit logging to capture all queries executed against the payroll database
• Set up real-time alerting for database errors or unusual query execution times that may indicate time-based blind SQL injection attempts
• Monitor for bulk data access patterns that may indicate successful data exfiltration

How to Mitigate CVE-2024-37873

Immediate Actions Required

• Restrict network access to the Payroll Management System to trusted IP addresses only
• Implement a Web Application Firewall (WAF) with SQL injection protection rules in front of the application
• Consider taking the affected application offline until a proper fix can be implemented
• Review database access logs for signs of prior exploitation

Patch Information

No official vendor patch is currently available for this vulnerability. Organizations using Itsourcecode Payroll Management System Project In PHP With Source Code version 1.0 should implement the workarounds listed below and consider migrating to a more actively maintained payroll management solution.

Workarounds

• Modify the view_payslip.php source code to use prepared statements or parameterized queries instead of string concatenation for SQL queries
• Implement strict input validation on the id parameter to ensure only numeric values are accepted
• Deploy a WAF configured to filter SQL injection attempts targeting the application
• Apply the principle of least privilege to the database user account used by the application to limit potential damage from exploitation
• Isolate the payroll management system in a separate network segment with restricted access

# Example: Restrict access to view_payslip.php via Apache .htaccess
# Add to .htaccess in the application directory

<Files "view_payslip.php">
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from 10.0.0.0/8
</Files>

# Alternatively, disable the vulnerable endpoint entirely
# until a code-level fix can be implemented
# <Files "view_payslip.php">
#     Deny from all
# </Files>