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Bug #11865

closed

SMB2 CREATE should check MxAc create context size

Added by Andrew Stormont over 2 years ago. Updated over 2 years ago.

Status:
Closed
Priority:
Normal
Category:
-
Start date:
Due date:
% Done:

100%

Estimated time:
Difficulty:
Medium
Tags:
Gerrit CR:

Description

The SMB2 server should fail with STATUS_INVALID_PARAMETER if the size of a MxAc create context is not large enough to hold the optional timestamp value. This is something the WPTS checks for by issuing a bogus CREATE request with a MxAc create context with a size of 4 bytes (the spec says it MUST be either 0 or 8 bytes long):

"The Data in the Buffer field of the SMB2_CREATE_CONTEXT MUST either contain the following structure or be empty (0 bytes in length)."
https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-smb2/5ea40835-5d40-4e85-977d-13cd745d3af8

This impacts the following WPTS test case:

InvalidCreateRequestStructureSize

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