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Win2k Permissions bug (fwd)
From: Alfred Huger <ah () securityfocus com>
Date: Sat, 9 Jun 2001 10:05:36 -0600 (MDT)



This came accross the PenTest mailing list today - thought it might be of
interest.


VP Engineering
SecurityFocus.com
"Vae Victis"

---------- Forwarded message ----------
Date: 8 Jun 2001 23:06:17 -0000
From: Parth Galen <Parth_Galen () ziplip com>
To: pen-test () securityfocus com
Subject: Win2k Permissions bug

FYI - I am relaying the following note for a friend. I will get all replies?to him ASAP. Thx.
----------------------------------

I been working on this issue through a Microsoft Premier Support ticket
for?about 60 days.  At this time we have not received a resolution nor
does one seem forthcoming.  I am very disappointed at the response, or
lack of response from Microsoft Support on what I believe is a serious
issue.  I feel that you and others should be aware of our findings.

There is apparently a bug in Windows 2000 Server regarding NTFS
permissions.  The symptom is that at the individual file level the Allow
Inheritable Permissions switch and NTFS file permissions can change
unexpectedly and without notification.  These changes to file security
easily go unknown to both network administrators and end users. Microsoft
has acknowledged a similar problem referenced in KB article Q266731.
Microsoft has created a hot fix for this issue, however in testing the?hot
fix has not corrected the problem that we have identified.

Example:  In the case where a particular file_s NTFS permissions are set
different from those of its parent folder and the inheritance box on the
file?has been unchecked, the inherit permissions box on the file can turn
itself on and the NTFS file permissions will then change to the
permissions defined on the parent folder when the file is modified and
saved.

Configuration where the problem has been observed:
 . Windows 2000 Server SP1
 . NT 4.0 SP6a Workstation
 . Various applications programs such as: Word 97, Excel 97, Visio 5.0

The problem seems to manifest itself when using applications that create
temp files.  As many current software packages do create temp files the
network security implications are obvious.  While security problems are
always serious, this one carries the additional danger of network security
being altered against the intention of the administrator, while the
administrator is unaware that security changes have taken place.

Any insight will be appreciated!
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