GHSA-7x4w-cj9r-h4v9: 
Ruby vulnerability analysis and mitigation

A critical vulnerability (GHSA-7x4w-cj9r-h4v9) was discovered in Camaleon CMS affecting versions below 2.8.1. The vulnerability, identified in September 2024, allows for remote code execution through code injection in the MediaController class. The issue stems from insufficient path validation, potentially allowing arbitrary file deletion on the server hosting Camaleon CMS (GitHub Advisory).

The vulnerability exists in the MediaController class where actions do not properly validate whether a given path is within permitted boundaries. The issue specifically involves the delete_file method of the CamaleonCmsLocalUploader class, where file paths are joined with the root folder without proper validation. The vulnerability has received a CVSS v4.0 score of 8.6 (High), with metrics indicating Network attack vector, Low attack complexity, and High privileges required (GitHub Advisory).

If successfully exploited, this vulnerability could lead to arbitrary file deletion on the server hosting Camaleon CMS, potentially resulting in a defective CMS or system. The vulnerability affects both system confidentiality and integrity, with high impact ratings for both aspects (GitHub Advisory).

The vulnerability has been patched in version 2.8.1. The recommended remediation includes normalizing all file paths constructed from untrusted user input and implementing checks to ensure resulting paths remain inside the targeted directory. Additionally, character sequences such as '..' in untrusted input used to build paths should be prohibited (GitHub Advisory).