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Re: [Full-disclosure] Samba Remote Zero-Day Exploit
The bug here is that out-of-path symlinks are remotely writable. If a pre-existing symlink is there, it's not a problem. But Kingcope's bug is legit, the fact that he can *generate* the symlink breaks the entire path concept of SMB shares. As long as "cd .." wasn't working, "symlink .." mustn't either.
I agree that a user with local access should be able to generate out of path symlinks -- there's no path constraint concept in local access (well, not without a restricted shell, but thats its own ball of wax). But Samba supports dropping a user into a path, and it really does need to keep him there.
(On a side note, you're not going to see this sort of symlink stuff on Windows, and Samba is supposed to match Windows semantics in general. Also, this sort of directory traversal pops up from year to year, in web platforms particularly, but also things like tar.)
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