Re: Priviledge escalation attack

From: Knud Erik Højgaard (knud@skodliv.dk)
Date: 10/28/02 

From: Knud Erik Højgaard <knud@skodliv.dk>
To: <focus-ms@securityfocus.com>
Date: Mon, 28 Oct 2002 18:37:10 +0100

> From: "Eric Howard" dlydl7502@sneakemail.com
[snip]
> Scenario:
>
> I (who am logged in as Administrator) am having a network connectivity
> problem. I drop to a command line prompt and type 'nbstat', that
> right 'nbstat', which is a typo. A batch file in the WINNT directory
> created by user with normal access privileges called 'nbstat.bat'
> executes. It dutifully reports "'nbstat' is not recognized as an
> operable program or batch file." and executes whatever code it wants with
> Administrator privileges. The fake error message pretty much guarantees I
> won't notice this.
>
> Far fetched? Ask yourself if you have ever made a typo at the Command
> line? Microsoft has made a GRAVE ERROR by allowing a system directory to
> be world writeable. People need to be aware of this problem and some
> action needs to be taken so this can be fixed.

Naming a file cmd.exe and placing it in the root of %SYSTEMDRIVE% will
happily run this instead of the one in %SYSTEMROOT% if 'cmd' is invoked from
the start/run box, regardless of my systemdrive (E:) being later in the path
than my systemroot. I believe this is old news... 

--
Knud Erik Højgaard

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