CVE-2025-9529: Campcodes Payroll Management System RCE

CVE-2025-9529 Overview

A file inclusion vulnerability has been identified in Campcodes Payroll Management System version 1.0. The vulnerability exists in the include function within the /index.php file, where improper handling of the page argument allows attackers to manipulate file paths and include arbitrary files. This weakness enables remote attackers to potentially access sensitive files or execute malicious code on the affected system.

Critical Impact

Remote attackers can exploit this file inclusion vulnerability to access sensitive configuration files, source code, or potentially achieve code execution by including malicious files on vulnerable Campcodes Payroll Management System installations.

Affected Products

• Campcodes Payroll Management System 1.0

Discovery Timeline

• 2025-08-27 - CVE-2025-9529 published to NVD
• 2026-04-29 - Last updated in NVD database

Technical Details for CVE-2025-9529

Vulnerability Analysis

This vulnerability is classified as CWE-73 (External Control of File Name or Path), a file inclusion weakness that occurs when an application uses user-supplied input to construct file paths without adequate validation. In the case of Campcodes Payroll Management System, the /index.php file accepts a page parameter that is passed directly to PHP's include function without proper sanitization.

The vulnerability is exploitable remotely over the network without requiring authentication or user interaction. An attacker can craft malicious requests containing path traversal sequences or references to sensitive files, potentially leading to information disclosure, source code exposure, or in some scenarios, remote code execution if the attacker can control a file on the server.

Root Cause

The root cause of this vulnerability lies in insufficient input validation of the page parameter in /index.php. The application fails to properly sanitize or whitelist the user-supplied input before using it in the include function. This allows attackers to manipulate the file path and include files outside the intended directory scope.

Common issues contributing to this vulnerability include:

• Lack of input validation on the page parameter
• Absence of path canonicalization to prevent directory traversal
• Missing whitelist of allowed pages/files
• Direct use of user input in file system operations

Attack Vector

The attack is carried out remotely via HTTP requests to the vulnerable /index.php endpoint. An attacker manipulates the page parameter to include arbitrary files from the server's file system. This can be achieved through Local File Inclusion (LFI) techniques, potentially using path traversal sequences like ../ to navigate to sensitive directories.

The vulnerability is publicly documented and exploit details have been made available, increasing the risk of exploitation in the wild. Attackers could leverage this to read configuration files containing database credentials, access PHP source code for further vulnerability discovery, or potentially achieve code execution through techniques like log file poisoning or PHP wrapper abuse.

For technical details regarding this vulnerability, refer to the GitHub CVE Issue Discussion and VulDB #321548.

Detection Methods for CVE-2025-9529

Indicators of Compromise

• HTTP requests to /index.php containing path traversal sequences (../, ..\\) in the page parameter
• Requests attempting to access sensitive files like /etc/passwd, wp-config.php, or .htaccess through the page parameter
• Web server logs showing unusual file path patterns in GET or POST requests to /index.php
• Attempts to include PHP wrapper protocols (e.g., php://filter, php://input) in the page parameter

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block path traversal patterns in HTTP requests
• Configure web server access logs to capture full request URIs and monitor for suspicious page parameter values
• Implement file integrity monitoring on sensitive system and configuration files
• Use intrusion detection systems (IDS) with signatures for Local File Inclusion attack patterns

Monitoring Recommendations

• Monitor web application logs for anomalous requests targeting /index.php with unusual page parameter values
• Set up alerts for any access attempts to system files or directories outside the web root
• Track failed file access attempts that may indicate exploitation attempts
• Review PHP error logs for file inclusion warnings or errors that could indicate attack activity

How to Mitigate CVE-2025-9529

Immediate Actions Required

• Restrict access to the Campcodes Payroll Management System to trusted networks only until a patch is available
• Implement web application firewall rules to block requests containing path traversal sequences
• Disable the vulnerable application if it is not critical to business operations
• Review server logs for signs of prior exploitation attempts

Patch Information

At the time of publication, no official patch has been released by Campcodes for this vulnerability. Organizations are advised to monitor the Campcodes website for security updates. In the meantime, implement the workarounds and compensating controls described below.

For additional technical information, consult:

• VulDB CTI ID #321548
• VulDB Submission ID #635551

Workarounds

• Implement a whitelist approach in the application code to only allow specific, predefined values for the page parameter
• Use PHP's basename() function to strip directory path components from user input before file inclusion
• Configure PHP's open_basedir directive to restrict file operations to the web application directory
• Disable PHP wrappers that could be abused for code execution by configuring allow_url_include = Off in php.ini

# PHP configuration hardening for file inclusion mitigation
# Add to php.ini or .htaccess

# Disable remote file inclusion
allow_url_include = Off
allow_url_fopen = Off

# Restrict file operations to application directory
open_basedir = /var/www/payroll-system/

# Disable dangerous PHP functions
disable_functions = exec,passthru,shell_exec,system,proc_open,popen