CVE-2025-7220: Campcodes Payroll Management SQLi Flaw

CVE-2025-7220 Overview

A critical SQL injection vulnerability has been identified in Campcodes Payroll Management System version 1.0. This vulnerability exists within the /ajax.php?action=save_deductions endpoint, where improper handling of the ID parameter allows attackers to inject malicious SQL queries. The vulnerability can be exploited remotely without authentication, potentially allowing unauthorized access to sensitive payroll data, modification of employee records, and complete database compromise.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to extract sensitive payroll and employee data, modify financial records, or potentially gain further access to the underlying system through database-level attacks.

Affected Products

• Campcodes Payroll Management System 1.0
• Web applications using the vulnerable /ajax.php?action=save_deductions endpoint

Discovery Timeline

• 2025-07-09 - CVE-2025-7220 published to NVD
• 2025-07-11 - Last updated in NVD database

Technical Details for CVE-2025-7220

Vulnerability Analysis

This SQL injection vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) affects the Campcodes Payroll Management System's deductions management functionality. The vulnerable endpoint at /ajax.php?action=save_deductions fails to properly sanitize or parameterize the ID argument before incorporating it into SQL queries.

The flaw allows attackers to manipulate database queries by injecting malicious SQL syntax through the ID parameter. Since this is a payroll management system, successful exploitation could expose highly sensitive information including employee personal data, salary information, tax records, and banking details. The network-accessible nature of this vulnerability means it can be exploited remotely by any attacker who can reach the application.

The exploit has been publicly disclosed, increasing the risk that threat actors may actively target installations of this software. Organizations using Campcodes Payroll Management System should treat this vulnerability with high priority.

Root Cause

The root cause of this vulnerability is insufficient input validation and the lack of parameterized queries in the application's database layer. The ID parameter passed to the save_deductions action is directly concatenated into SQL statements without proper sanitization, escaping, or the use of prepared statements with bound parameters.

This is a classic SQL injection pattern where user-controlled input flows directly into database queries. The application trusts the ID parameter implicitly rather than treating it as potentially malicious input that requires validation and safe handling.

Attack Vector

The attack vector for CVE-2025-7220 is network-based, requiring no authentication or user interaction. An attacker can craft malicious HTTP requests to the /ajax.php?action=save_deductions endpoint with SQL injection payloads embedded in the ID parameter.

The vulnerability allows for various SQL injection techniques including:

• Union-based injection to extract data from other database tables
• Boolean-based blind injection to infer database contents
• Time-based blind injection for data exfiltration when direct output is not available
• Stacked queries (if supported by the database driver) for executing arbitrary SQL commands

Additional technical details and proof-of-concept information are available in the GitHub CVE Issue Discussion and VulDB entry #315169.

Detection Methods for CVE-2025-7220

Indicators of Compromise

• Unusual or malformed requests to /ajax.php?action=save_deductions containing SQL syntax characters such as single quotes, double dashes, semicolons, or UNION keywords
• Database error messages in application logs indicating syntax errors from injected SQL
• Unexpected database query patterns or access to tables outside normal application behavior
• Evidence of data exfiltration or bulk data access from payroll-related database tables

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns targeting the /ajax.php endpoint
• Enable detailed logging for all requests to the save_deductions action and monitor for suspicious ID parameter values
• Deploy database activity monitoring to identify anomalous query patterns or unauthorized data access
• Use intrusion detection systems with signatures for common SQL injection attack patterns

Monitoring Recommendations

• Set up real-time alerting for HTTP requests containing SQL injection indicators (quotes, comments, UNION statements) in the ID parameter
• Monitor database logs for failed authentication attempts or privilege escalation queries
• Track application error rates, as SQL injection attempts often trigger parsing errors before successful exploitation
• Implement anomaly detection for data access patterns that deviate from normal payroll processing workflows

How to Mitigate CVE-2025-7220

Immediate Actions Required

• Restrict network access to the Campcodes Payroll Management System to trusted IP addresses only until a patch is available
• Implement input validation on the ID parameter to accept only numeric values
• Deploy a Web Application Firewall with SQL injection protection in front of the application
• Review database logs for signs of prior exploitation and assess potential data exposure
• Consider taking the application offline if it contains highly sensitive data and cannot be adequately protected

Patch Information

At the time of publication, no official patch from the vendor has been identified for this vulnerability. Organizations should monitor the CampCodes website for security updates. Given the critical nature of this SQL injection vulnerability and the sensitivity of payroll data, organizations unable to apply mitigations should strongly consider alternative solutions.

Workarounds

• Implement application-level input validation to ensure the ID parameter only accepts expected integer values
• Use a reverse proxy or WAF to filter requests containing SQL injection patterns before they reach the application
• Apply database-level access controls to limit the application's database user permissions to the minimum required
• If source code access is available, modify the vulnerable code to use parameterized queries or prepared statements

# Example WAF rule to block SQL injection in ID parameter (ModSecurity syntax)
SecRule ARGS:ID "@rx (\%27)|(\')|(\-\-)|(%23)|(#)" \
    "id:1001,phase:2,deny,status:403,msg:'SQL Injection Attempt Blocked in ID parameter'"