Unrestricted File Upload in Redeight CMS Leads to RCE

Compliance Impact

The vulnerability allows authenticated attackers to upload and execute arbitrary PHP scripts on the server, which can lead to unauthorized access and control over the system.

Such unauthorized access and potential data breaches can compromise the confidentiality, integrity, and availability of sensitive data, which are core requirements under regulations like GDPR and HIPAA.

Therefore, this vulnerability poses a significant risk to compliance with these standards, as it may lead to exposure of personal or protected health information and failure to maintain adequate security controls.

Useful 0 Not Useful 0

Impact Analysis

This vulnerability can have severe impacts including allowing attackers to execute arbitrary code on the affected server. This can lead to full system compromise, unauthorized access to sensitive data, disruption of services, and potential use of the server as a launch point for further attacks.

Useful 0 Not Useful 0

Executive Summary

This vulnerability is an Unrestricted File Upload issue in Redeight CMS version 1.0. It allows authenticated attackers to upload arbitrary PHP scripts via the POST "/admin/index.php?module=pages&mode=FileAdd" endpoint. The application does not properly validate file extensions or MIME types, enabling attackers to place executable PHP files in the publicly accessible "/uploads/files/" directory. These uploaded scripts can then be executed directly by the web server, leading to Remote Code Execution.

Useful 0 Not Useful 0

Detection Guidance

This vulnerability can be detected by checking for the presence of suspicious PHP files uploaded to the publicly accessible /uploads/files/ directory on the Redeight CMS server.

Since the vulnerability involves unrestricted file upload via the POST request to /admin/index.php?module=pages&mode=FileAdd, monitoring HTTP POST requests to this endpoint for unusual file uploads can help detect exploitation attempts.

Suggested commands to detect potentially malicious files include:

• Using find to locate PHP files in the uploads directory: find /path/to/redeight/uploads/files/ -type f -name "*.php"
• Checking web server access logs for POST requests to the vulnerable endpoint: grep "POST /admin/index.php?module=pages&mode=FileAdd" /var/log/apache2/access.log
• Using network monitoring tools to inspect HTTP traffic for suspicious file uploads to the endpoint.

Useful 0 Not Useful 0

Mitigation Strategies

Immediate mitigation steps include restricting or disabling file uploads to the /admin/index.php?module=pages&mode=FileAdd endpoint until a patch is applied.

Implement strict validation of file extensions and MIME types on the server side to prevent uploading of executable PHP scripts.

Restrict access to the /uploads/files/ directory to prevent direct execution of uploaded scripts, for example by disabling execution permissions or using web server configuration to deny execution.

Monitor and audit uploaded files regularly to detect and remove any malicious scripts.

Apply any available security patches or updates from the Redeight CMS vendor as soon as they are released.

Useful 0 Not Useful 0