The owner_set function in smbcacls.c in smbcacls in Samba 4.0.x before
4.0.16 and 4.1.x before 4.1.6 removes an ACL during use of a --chown
or --chgrp option, which allows remote attackers to bypass intended
access restrictions in opportunistic circumstances by leveraging an
unintended administrative change.
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