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Is there any way to exploit a windows share when NTFS permission restrict it?

Posted on 2011-09-30
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Last Modified: 2012-05-12
Simple question:
If a Windows Share is set up with the permission Everyone - Full Access, and only the Domain Admins group is configured as having access to the folder through NTFS permissions, is there any way that share then becomes a security vulnerablity?

Windows server management 101 has always dictated that share vs NTFS = the most restrictive permission always applies.  that being the case, I wouldn't think it would matter from a security perspective what the share permission is set to as long as the folder's access is restricted by NTFS.

Historically, you always hear about how Windows shares open up security holes, however, I've never understood why it matters as long as NTFS is restricting access.  i want to make sure I'm not missing something...
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Question by:patriots
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4 Comments
 
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by:
jrwarren earned 100 total points
ID: 36892632
There is a continual debate on share and share permissions.
   The old Set a share to Everyone - Full and lockdown via NTFS works, still.

However if only people internal to the domain are going to access the shares, I would suggest setting Domain Users to Full, this removes the Guest access from the equation.  Then use standard operating procedure for setting restrictive permissions on groups for the folder permissions.
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Assisted Solution

by:Amitabh Singh
Amitabh Singh earned 150 total points
ID: 36892659
Hello

Windows Share have simple meaning = applying on shared object  
NTFS permission = is allowing you to restrict user to access object @ file system level

so if something is blocked on file system level (NTFS permission)  their is no possibility to access via share (even you have everyone full control )

Example : System Folder C:\Windows folder  share as Admin$ and only administrators have access to it  
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Assisted Solution

by:Amitabh Singh
Amitabh Singh earned 150 total points
ID: 36892739
as system administrator its not a problem to share a folder to everyone , wear only administrator have NTFS access ,

but if you think security point of view , shared resources are less secured then non shared resource, its making more possibility to be affected by a virus  and expanding virus  to other system in your network

because of that some company even  do not allow  File and print sharing service on TCP level
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Author Comment

by:patriots
ID: 36893501
I know that security standards organizations frown upon an open share on any server.  Fine, I get it.  However, knowing the mechanics of how share and NTFS permissions have worked together going all the way back to NT4, I fail to see why "Everyone - Full" is ever a danger from any malicious activity or software so long as NTFS is locked down.  About all that can happen is that the share is visible across the network, but if you can't right to the folder then what good is it for anyone with malicious intent.

The only way you could say that the open Share is a danger with NTFS locked down is if somehow NTFS security is compromised, and if that happens, then all bets are off and you could then access any part of the system regardless of share permission status.
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