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CVE-2017-18048 is a critical vulnerability in Monstra CMS 3.0.4 that allows users with editor privileges to upload arbitrary files, bypassing the file extension filter by using uppercase extensions (e.g., ".PHP"). This enables attackers to upload and execute malicious PHP scripts, resulting in remote command execution on the server. The vulnerable code is located in monstra\plugins\box\filesmanager\filesmanager.admin.php on line 19. The vendor has not responded to reports, and the software appears abandoned.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a single Metasploit module (modules/exploits/multi/http/monstra_fileupload_exec.rb) that exploits an authenticated arbitrary file upload vulnerability in Monstra CMS version 3.0.4 (CVE-2017-18048). The exploit works by logging in with valid credentials, obtaining a CSRF token, and uploading a malicious PHP file to the server via the files manager. The uploaded file is then executed by accessing it through the public uploads directory, resulting in remote code execution. The module is weaponized, supporting customizable PHP payloads (defaulting to Meterpreter reverse shell), and leverages standard Metasploit options and conventions. The main endpoints targeted are the admin login, file manager, and the public uploads directory. The exploit requires authentication and targets a specific version of Monstra CMS.
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