Red Hat: CVE-2021-44141: Information leak via symlinks of existance of files or directories outside of the exported share (Multiple Advisories)

All versions of Samba prior to 4.15.5 are vulnerable to a malicious client using a server symlink to determine if a file or directory exists in an area of the server file system not exported under the share definition. SMB1 with unix extensions has to be enabled in order for this attack to succeed.