CVE-2025-9476: HR Information System Auth Bypass Flaw

CVE-2025-9476 Overview

A critical unrestricted file upload vulnerability has been identified in SourceCodester Human Resource Information System version 1.0. The vulnerability exists within the file /Superadmin_Dashboard/process/editemployee_process.php, where improper handling of the employee_file201 parameter allows attackers to upload arbitrary files without proper validation or restrictions. This flaw can be exploited remotely, potentially enabling attackers to upload malicious scripts and gain unauthorized access to the affected system.

Critical Impact
Remote attackers can exploit this unrestricted file upload vulnerability to upload malicious files (such as web shells) to the server, potentially leading to remote code execution, data theft, or complete system compromise.

Affected Products

SourceCodester Human Resource Information System 1.0
nelzkie15 human_resource_information_system version 1.0
Applications using the vulnerable editemployee_process.php endpoint

Discovery Timeline

2025-08-26 - CVE-2025-9476 published to NVD
2025-09-02 - Last updated in NVD database

Technical Details for CVE-2025-9476

Vulnerability Analysis

This vulnerability stems from improper access control (CWE-284) in the employee file upload functionality. The affected endpoint /Superadmin_Dashboard/process/editemployee_process.php fails to properly validate and restrict file uploads submitted through the employee_file201 parameter. Without adequate file type validation, size restrictions, or content verification, the application accepts arbitrary file uploads from remote attackers.

The vulnerability is network-accessible and requires no user interaction or authentication to exploit. An attacker can craft malicious HTTP requests to upload files with dangerous extensions (such as .php, .asp, or .jsp) that can then be executed on the server, leading to complete system compromise.

Root Cause

The root cause of this vulnerability is inadequate input validation and missing access controls on the file upload functionality. The application fails to implement essential security measures including:

File extension whitelisting or blacklisting
MIME type verification
File content inspection
Upload directory isolation with execution restrictions
Authentication and authorization checks on the upload endpoint

This represents a classic CWE-284 (Improper Access Control) vulnerability where the application does not properly restrict the types of files that can be uploaded.

Attack Vector

The attack can be launched remotely over the network by sending crafted HTTP POST requests to the vulnerable endpoint. An attacker would manipulate the employee_file201 parameter to upload malicious files.

The exploitation flow typically involves:

Identifying the vulnerable upload endpoint at /Superadmin_Dashboard/process/editemployee_process.php
Crafting a malicious file (e.g., a PHP web shell)
Submitting the file through the employee_file201 parameter via HTTP POST
Accessing the uploaded file to execute malicious code on the server

Since this vulnerability has been publicly disclosed, organizations using this system should take immediate action to mitigate the risk. Technical details are available through the GitHub Issue Discussion and VulDB entry #321345.

Detection Methods for CVE-2025-9476

Indicators of Compromise

Unexpected files with executable extensions (.php, .jsp, .asp, .aspx) appearing in upload directories
Web server logs showing POST requests to /Superadmin_Dashboard/process/editemployee_process.php from suspicious IP addresses
Newly created or modified files in web-accessible directories that were not authorized
Unusual outbound network connections from the web server
Evidence of web shell access patterns in server logs

Detection Strategies

Monitor HTTP POST requests to the editemployee_process.php endpoint for suspicious file uploads
Implement file integrity monitoring on web server directories to detect unauthorized file creation
Deploy web application firewalls (WAF) with rules to detect and block malicious file upload attempts
Review web server access logs for patterns indicative of exploitation attempts

Monitoring Recommendations

Enable detailed logging on the web application and web server to capture all upload activity
Configure alerts for file creation events in upload directories with executable extensions
Monitor for unusual process execution originating from web server directories
Implement network traffic analysis to detect command-and-control communications from potential web shells

How to Mitigate CVE-2025-9476

Immediate Actions Required

Restrict access to the /Superadmin_Dashboard/ directory to trusted IP addresses only
Implement authentication and authorization checks on all administrative endpoints
Disable or remove the vulnerable editemployee_process.php file if not essential
Review existing uploaded files for any suspicious or unauthorized content
Consider taking the application offline until proper mitigations are in place

Patch Information

No official vendor patch has been released at this time. Organizations should monitor the SourceCodester website for security updates. Given the public disclosure of this vulnerability, implementing defensive measures is critical until an official patch becomes available.

Additional technical information can be found at:

Workarounds

Implement server-side file type validation using whitelist-only approach (e.g., allow only .jpg, .png, .pdf)
Configure the web server to prevent script execution in upload directories using .htaccess or equivalent
Add authentication requirements to the vulnerable endpoint
Use a Web Application Firewall (WAF) to filter malicious upload attempts
Rename uploaded files and store them outside the web root with non-executable permissions

bash

# Example Apache .htaccess configuration to disable script execution in upload directory
# Place this file in the uploads directory

# Disable script execution
<FilesMatch "\.(php|php3|php4|php5|phtml|pl|cgi|asp|aspx|jsp)$">
    Order Deny,Allow
    Deny from all
</FilesMatch>

# Alternative: Disable PHP entirely in this directory
php_flag engine off