Stefan Metzmacher discovered a flaw in Samba, a SMB/CIFS file, print, and login server for Unix. Specific combinations of parameters and permissions can allow user to escape from the share path definition and see the complete "/" filesystem. Unix permission checks in the kernel are still enforced. Details can be found in the upstream advisory at https://www.samba.org/samba/security/CVE-2019-10197.html