Executive Summary

CVE-2025-62429 is a vulnerability in ClipBucket v5 (prior to version 5.5.2) that allows an attacker with administrator privileges to execute arbitrary PHP code on the server. This happens because the 'type' parameter in a POST request is embedded directly into PHP tags without proper sanitization in the file /upload/admin_area/actions/update_launch.php. By injecting malicious code into this parameter, an attacker can run arbitrary shell commands, leading to remote code execution (RCE). [2]

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Impact Analysis

This vulnerability can lead to a full remote code execution on the server hosting ClipBucket v5, allowing an attacker with administrator access to execute arbitrary PHP code and shell commands. This can result in complete system compromise, including unauthorized access, data theft, data modification, service disruption, and potentially taking control of the entire server environment. [2]

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Detection Guidance

This vulnerability can be detected by attempting to exploit the arbitrary PHP code execution via the vulnerable 'type' parameter in a POST request to /upload/admin_area/actions/update_launch.php. For example, using a curl command with administrator privileges to send a crafted POST request such as: curl -X POST -d "type=core';shell_exec('touch /tmp/malicious.txt');//" https://your-clipbucket-site/upload/admin_area/actions/update_launch.php. If the file /tmp/malicious.txt is created on the server, it indicates the vulnerability is present. [2]

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Mitigation Strategies

The immediate mitigation step is to update ClipBucket v5 to version 5.5.2 or later, where this vulnerability has been fixed. This update addresses the arbitrary PHP code execution issue along with other security fixes. Additionally, restrict administrator access and monitor for suspicious POST requests to the vulnerable endpoint until the update is applied. [3]

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