Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
From VID-145A3E17-CEA2-11E9-81E2-005056A311D1:
The samba project reports:
On a Samba SMB server for all versions of Samba from 4.9.0 clients are
able to escape outside the share root directory if certain
configuration parameters set in the smb.conf file.
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