[cifs-protocol] [MS-SMB2] allow read based on FILE_EXECUTE permission [116073114482785]

Obaid Farooqi obaidf at microsoft.com
Sun Jul 31 22:41:48 UTC 2016

Hi Uri:
Thanks for contacting Microsoft. I have created a case to track this issue. A member of the open specifications team will be in touch soon.

Obaid Farooqi
Escalation Engineer | Microsoft

Exceeding your expectations is my highest priority.  If you would like to provide feedback on your case you may contact my manager at ramagane at Microsoft dot com

-----Original Message-----
From: Uri Simchoni [mailto:uri at samba.org] 
Sent: Sunday, July 31, 2016 12:45 PM
To: Interoperability Documentation Help <dochelp at microsoft.com>
Cc: cifs-protocol at lists.samba.org
Subject: [MS-SMB2] allow read based on FILE_EXECUTE permission


This question concerns the right to read from a file opened with FILE_EXECUTE but without FILE_READ_DATA in the desired access mask.

According to [MS-SMB2] section section, about how to process a READ request:

If Open.GrantedAccess does not allow for FILE_READ_DATA, the request MUST be failed with STATUS_ACCESS_DENIED.

However, testing against Windows Server 2012R2 shows that if FILE_EXECUTE is granted instead of FILE_READ_DATA, the read is also allowed (I suppose this has to do with running executables...)

The attached tcpdump packet trace demonstrates that - in packet 22, EOF is returned instead of ACCESS_DENIED.

Can you please clarify?


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