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Re: Samba Remote Zero-Day Exploit



Michael Wojcik wrote:

>> From: Stefan Kanthak [mailto:stefan.kanthak@xxxxxxxx]
>> Sent: Saturday, 06 February, 2010 08:21
>> 
>> Dan Kaminsky wrote:
>> 
>> [...]
>> 
>> > (On a side note, you're not going to see this sort of symlink stuff
>> > on Windows,
>> 
>> What exactly do you mean?
>> Traversing symlinks on the server/share, or creation of "wide"
>symlinks
>> by the client on the server/share?
>> 
>> Since Windows 2000 NTFS supports "junctions", which pretty much
>> resemble Unix symlinks, but only for directories.
>> See <http://support.microsoft.com/kb/205524/en-us>
>
> And at least since Vista, it also supports symlinks, which are designed

s/at least//

[ well-known facts snipped ]

> The Windows SMB server apparently won't cross reparse points, though, so
> there's no equivalent vulnerability.

NO, Windows SMB server crosses reparse points!

But as Dan Kaminsky pointed out, you need to have administrative rights
to remotely create a junction on an SMB share, so the non-admin user
cant get himself access to files outside a share he's allowed to access.

Stefan