Admidio is an open-source user management solution

Overview

Admidio is an open-source user management solution. Prior to version 5.0.10, modules/documents-files.php gates state-changing modes by checking that the actor has hasUploadRight() on the URL parameter folder_uuid. The move_save handler then operates on a separate URL parameter file_uuid and calls File::moveToFolder($destFolderUUID). File::moveToFolder() checks the upload right on the destination folder but never on the source folder containing the file. As a result, any user who can upload to any single folder can move any file from any other folder — including private folders to which they have no view rights — into a folder they control, and then download it. Confidentiality is broken (private file contents leak) and integrity is broken (the file is removed from the original location). Version 5.0.10 contains a fix.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.