Marcel Neumann, Robert Altschaffel, Loris Guba and Dustin Hermann discovered that debian-edu-config, a set of configuration files used for the Debian Edu blend configured insecure permissions for the user web shares , which could result in privilege escalation. If PHP functionality is needed for the user web shares, please refer to /usr/share/doc/debian-edu-config/README.public_html_with_PHP-CGI+suExec.md