Description
ATutor through 2.2.4 is vulnerable to arbitrary file uploads via the mods/_core/backups/upload.php (aka backup) component. This may result in remote command execution. An attacker can use the instructor account to fully compromise the system using a crafted backup ZIP archive. This will allow for PHP files to be written to the web root, and for code to execute on the remote server.
Remediation
References
Related Vulnerabilities
Internet Information Services Other Vulnerability (CVE-1999-0450)
WordPress Plugin Question and Answer Forum 'title' Variable Cross-Site Scripting (1.2.4)
Moodle Permissions, Privileges, and Access Controls Vulnerability (CVE-2016-2190)
WordPress Plugin Visualizer:Tables and Charts Manager for WordPress Cross-Site Scripting (3.9.1)