CVE-2024-4966: Sinamjackson Schoolwebtech RCE Vulnerability

CVE-2024-4966 Overview

A critical unrestricted file upload vulnerability has been identified in SourceCodester SchoolWebTech version 1.0. The vulnerability exists in the /improve/home.php file, where improper validation of the image parameter allows attackers to upload arbitrary files to the server. This flaw can be exploited remotely without authentication, potentially leading to remote code execution if malicious scripts are uploaded and executed on the target system.

Critical Impact

Remote attackers can upload malicious files without authentication, potentially achieving code execution on vulnerable SchoolWebTech installations.

Affected Products

• SourceCodester SchoolWebTech 1.0
• Sinamjackson SchoolWebTech 1.0

Discovery Timeline

• 2024-05-16 - CVE-2024-4966 published to NVD
• 2025-02-10 - Last updated in NVD database

Technical Details for CVE-2024-4966

Vulnerability Analysis

This vulnerability is classified as CWE-434 (Unrestricted Upload of File with Dangerous Type). The affected component /improve/home.php fails to properly validate uploaded files through the image parameter. Without adequate file type restrictions, content-type validation, or file extension checks, an attacker can upload files containing malicious code such as PHP web shells.

The attack can be executed remotely over the network without requiring user interaction or prior authentication. Once a malicious file is uploaded, if the server processes or executes the uploaded content, it could result in full system compromise. The vulnerability affects confidentiality, integrity, and availability of the system, though the immediate impact is considered limited in scope.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and missing security controls for file upload functionality. The application fails to implement proper checks including:

• File extension validation against an allowlist
• MIME type verification
• File content inspection
• Secure storage location configuration

This allows any file type to be uploaded to the server through the vulnerable endpoint.

Attack Vector

The attack vector is network-based, allowing remote exploitation. An attacker can craft a malicious HTTP request targeting the /improve/home.php endpoint with a specially crafted file in the image parameter. The attack requires no authentication and no user interaction, making it particularly dangerous for publicly accessible installations.

The exploit has been disclosed publicly, as documented in the GitHub Issue Discussion and VulDB Entry #264534. Attackers can leverage this information to craft exploit payloads targeting vulnerable systems.

Detection Methods for CVE-2024-4966

Indicators of Compromise

• Unexpected files appearing in upload directories, particularly files with executable extensions (.php, .phtml, .phar)
• HTTP POST requests to /improve/home.php containing suspicious file uploads
• Web server logs showing access to newly uploaded files in upload directories
• Unusual process execution originating from the web server process

Detection Strategies

• Monitor web server access logs for POST requests to /improve/home.php with multipart/form-data content
• Implement file integrity monitoring on web server upload directories
• Deploy web application firewall (WAF) rules to detect and block suspicious file upload attempts
• Use SentinelOne Singularity to detect malicious file execution and behavioral anomalies on web servers

Monitoring Recommendations

• Enable detailed logging for the SchoolWebTech application and web server
• Configure alerts for new file creation events in web-accessible directories
• Monitor for outbound network connections from the web server that may indicate reverse shell activity
• Review uploaded files periodically for suspicious content or unexpected file types

How to Mitigate CVE-2024-4966

Immediate Actions Required

• Restrict network access to the SchoolWebTech application to trusted networks only
• Implement web application firewall rules to block malicious file upload attempts
• Disable the affected upload functionality if not required for business operations
• Review web server directories for any suspicious or unauthorized files
• Consider taking the application offline until a permanent fix is applied

Patch Information

No official patch has been released by the vendor at the time of this publication. Organizations using SchoolWebTech 1.0 should contact the vendor for remediation guidance or consider implementing the workarounds described below. Additional technical information is available from VulDB CTI Entry #264534 and the VulDB Submission #334216.

Workarounds

• Implement strict file type validation at the web server level (e.g., via .htaccess rules for Apache)
• Configure the upload directory to prevent script execution using server directives
• Add application-level allowlist filtering for permitted file extensions (e.g., .jpg, .png, .gif only)
• Implement content-type validation and magic byte verification for uploaded files
• Store uploaded files outside the web root or in a location that disallows script execution

# Apache configuration to prevent script execution in upload directory
# Add to .htaccess in the upload directory
<Directory /path/to/upload/directory>
    php_admin_flag engine off
    RemoveHandler .php .phtml .php3 .php4 .php5 .phar
    AddType text/plain .php .phtml .php3 .php4 .php5 .phar
</Directory>