Executive Summary

This vulnerability in CMSimple 5.15 allows authenticated attackers to perform remote command execution by modifying file extensions and uploading malicious PHP files. Specifically, attackers can append ',php' to the Extensions_userfiles setting and upload a shell script to the media directory, enabling them to execute arbitrary code on the server.

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Impact Analysis

The vulnerability can lead to unauthorized remote code execution on the affected server, potentially allowing attackers to take control of the server, access sensitive data, modify or delete files, and disrupt services.

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Mitigation Strategies

To mitigate this vulnerability, immediately restrict or review user permissions to prevent authenticated users from modifying file extensions. Disable or restrict the ability to append ',php' to Extensions_userfiles. Monitor and control file uploads to the media directory, ensuring that only safe file types are allowed. Additionally, scan the media directory for any suspicious PHP files and remove them. Applying any available patches or updates from CMSimple is also recommended.

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