An unrestricted file upload issue in HorizontCMS through 1.0.0-beta allows an authenticated remote attacker (with access to the FileManager) to upload and execute arbitrary PHP code by uploading a PHP payload, and then using the FileManager's rename function to provide the payload (which will receive a random name on the server) with the PHP extension, and finally executing the PHP file via an HTTP GET request to /storage/<php_file_name>. NOTE: the vendor has patched this while leaving the version number at 1.0.0-beta.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-27387
• rapid7/metasploit-framework#14340
• ttimot24/HorizontCMS@436b5ab
• https://blog.vonahi.io/whats-in-a-re-name/
• http://packetstormsecurity.com/files/160046/HorizontCMS-1.0.0-beta-Shell-Upload.html