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Re: Microsoft Windows Vista/2003/XP/2000 file management security issues
Date: Sat, 10 Mar 2007 00:01:06 +0300

Dear Laundrup, Jens,

C:\TEMP is not best example, but there are another.

Microsoft  Word creates temporary file with predictable name in the same
directory with document. In the case of directory permissions like:

Users: Add & List
Creator Owner: Full control

(one user should not read documents created by another user)

it  may  creates  security issue. And you may attempt to exploit it with
"preopen  files".

Tim  is right, it's attack vector, not vulnerability. You must have this
attack vector in mind during application development and administration.
I don't know if attack against e.g. Microsoft Word will work, it need to
be tested.

--Friday, March 9, 2007, 9:12:10 PM, you wrote to tim-security () sentinelchicken org:

LJ> Pardon me for maybe being a little naïve here, but the situation you state:

LJ> "I have conducted code reviews on several commercial apps which
LJ> use C:\TEMP in very insecure ways to store sensitive data."  

LJ> That would certainly seem to me that a programmer and the QA
LJ> process failed.  I struggle to see where Windows is to blame for
LJ> that.  I am no "Windows lover" but as a working security
LJ> professional, I see as much poorly written code junking up Linux,
LJ> Unix, Apples (yes we have them all) as I see with Windows, yet in
LJ> those situations, will you blame the OS there too?  I think it is
LJ> time you take the bias you have, set it aside and look at the
LJ> statement you made which was concise, accurate and factual, then
LJ> point the blame where it belongs; at the code writers whose code you
LJ> review!.  

LJ> Cheers

LJ> Jens 

LJ> -----Original Message-----
LJ> From: Tim [mailto:tim-security () sentinelchicken org] 
LJ> Sent: Friday, March 09, 2007 8:20 AM
LJ> To: Roger A. Grimes
LJ> Cc: bugtraq () securityfocus com; full-disclosure () lists grok org uk
LJ> Subject: Re: [Full-disclosure] Microsoft Windows
LJ> Vista/2003/XP/2000 file management security issues

LJ> Roger,

But we'll have to agree to disagree. Your security scenarios are just
bizarre. It's a lot easier to hack people then going through all the
interations you suggest.

For one, I've been a sys admin for 20 years and NEVER created a
private folder under a public folder. Not in my Novell days, not in my
Windows days. The only time I've seen a private folder created under a
public folder is the \Users folder, and in that case, the users only
have Read and List access to the parent \Users folder, and then Full
Control to their own folders.

LJ> I find your assessment somewhat short-sighted.  It seems some of these attacks would be
LJ> possible in those situations.

LJ> Sure, Windows is already pathetically insecure against an attackers
LJ> already on the local system, but this would be yet another attack
LJ> vector.

LJ> tim

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