full-disclosure - Re: Samba Remote Zero-Day Exploit

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Message-ID: <7E749CB2FE5F46B185786C68FF1B5EFE@localhost>
Date: Mon, 8 Feb 2010 22:33:28 +0100
From: "Stefan Kanthak" <stefan.kanthak@...go.de>
To: <full-disclosure@...ts.grok.org.uk>,
	<bugtraq@...urityfocus.com>
Cc: Michael Wojcik <Michael.Wojcik@...rofocus.com>
Subject: Re: Samba Remote Zero-Day Exploit

Michael Wojcik wrote:

>> From: Stefan Kanthak [mailto:stefan.kanthak@...go.de]
>> 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

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