CVE-2024-8567: Payroll Management System SQLi Vulnerability

CVE-2024-8567 Overview

A critical SQL injection vulnerability has been identified in itsourcecode Payroll Management System version 1.0. The vulnerability exists in the file /ajax.php?action=delete_deductions where improper handling of the id parameter allows attackers to inject malicious SQL queries. This flaw can be exploited remotely without authentication, potentially leading to unauthorized data access, modification, or deletion within the payroll database.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to manipulate database queries, potentially accessing sensitive payroll data, employee information, and financial records without requiring authentication.

Affected Products

• itsourcecode Payroll Management System 1.0
• payroll_management_system_project payroll_management_system

Discovery Timeline

• 2024-09-08 - CVE-2024-8567 published to NVD
• 2024-09-10 - Last updated in NVD database

Technical Details for CVE-2024-8567

Vulnerability Analysis

This SQL injection vulnerability (CWE-89) occurs in the deduction deletion functionality of the Payroll Management System. The application fails to properly sanitize user-supplied input in the id parameter before incorporating it into SQL queries. When a user submits a request to /ajax.php?action=delete_deductions, the id parameter value is directly concatenated into the database query without proper parameterization or input validation.

The vulnerability is network-accessible, meaning attackers can exploit it remotely. The exploit has been publicly disclosed, increasing the risk of widespread exploitation against unpatched systems. Successful exploitation could allow attackers to read sensitive employee and payroll data, modify salary records, delete critical database entries, or potentially gain further access to the underlying database server.

Root Cause

The root cause of this vulnerability is the failure to implement proper input validation and parameterized queries (prepared statements) when handling user-supplied data. The application directly incorporates the id parameter into SQL queries without sanitization, allowing specially crafted input to modify the intended query structure and execute arbitrary SQL commands.

Attack Vector

The attack can be initiated remotely over the network. An attacker sends a malicious HTTP request to the vulnerable endpoint /ajax.php?action=delete_deductions with a crafted id parameter containing SQL injection payloads. No authentication or user interaction is required to exploit this vulnerability.

The vulnerability mechanism involves manipulating the id parameter to inject SQL syntax that alters the query logic. For example, an attacker could inject SQL commands to extract data from other tables, bypass deletion restrictions, or perform administrative database operations. Technical details and proof-of-concept information are available in the GitHub Issue Tracker.

Detection Methods for CVE-2024-8567

Indicators of Compromise

• Unusual SQL error messages in application logs indicating malformed queries to /ajax.php
• Unexpected database queries containing SQL keywords like UNION, SELECT, DROP, or -- in the id parameter
• Access logs showing requests to /ajax.php?action=delete_deductions with abnormally long or encoded id values
• Database audit logs revealing unauthorized data access or modification operations

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns in HTTP requests
• Monitor application logs for SQL syntax errors and suspicious query patterns targeting the delete_deductions action
• Deploy database activity monitoring to detect anomalous queries originating from the application
• Use SentinelOne Singularity platform to detect exploitation attempts and post-exploitation activity

Monitoring Recommendations

• Enable detailed logging for the /ajax.php endpoint to capture all request parameters
• Configure alerts for database query failures or timeouts associated with the payroll application
• Monitor for unauthorized data exfiltration attempts from the payroll database
• Review access patterns to sensitive payroll data for anomalous behavior

How to Mitigate CVE-2024-8567

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 detection rules
• Disable or remove the affected /ajax.php?action=delete_deductions functionality if not critical
• Conduct a security audit of the database to identify any unauthorized access or data modifications

Patch Information

No official vendor patch has been released for this vulnerability at the time of publication. Organizations using itsourcecode Payroll Management System 1.0 should implement the workarounds below and monitor IT Source Code for any security updates. Additional vulnerability details are available at VulDB #276797.

Workarounds

• Implement input validation to ensure the id parameter contains only numeric values
• Modify the application code to use parameterized queries (prepared statements) for all database operations
• Deploy network segmentation to isolate the payroll system from untrusted networks
• Consider migrating to a more actively maintained payroll management solution with better security practices

# Example: Restrict access to the vulnerable endpoint via .htaccess
# Add to your Apache configuration or .htaccess file

<Files "ajax.php">
    # Deny access from all by default
    Require all denied
    # Allow only from trusted internal network
    Require ip 192.168.1.0/24
    Require ip 10.0.0.0/8
</Files>