Everything old is new again; it's 2010 and there are still undiscovered old chestnuts in enterprise applications. In this case, @kingcope has uncovered a directory traversal bug hidden in plain sight.
If you look at the YouTube conversation, Samba luminary jeremy Allison acknowledges and promises to address the bug, so it's going to be closed quickly. It is a little disturbing, though, issues that we understand this well are still out there.
I don't think the underlying issue is that there was a bug -- it's that the development process didn't catch something this obvious and well-understood. Along the same lines, the fix isn't simply patching a bug; Samba should re-examine it's security process and code acceptance criteria.
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