bugtraq - Re: Microsoft Window Utility Manager Local Elevation of Privileges

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Message-ID: <sc7af0d62m1c794i17b1ulao2cgkpeh42i@4ax.com>
Date: Wed, 14 Jul 2004 12:58:05 +0100
From: Chris Paget <ivegotta@...bom.co.uk>
To: "Vivek Rathod (Application Security, Inc.)" <vrathod@...secinc.com>
Cc: bugtraq@...urityfocus.com
Subject: Re: Microsoft Window Utility Manager Local Elevation of Privileges


On Tue, 13 Jul 2004 16:00:33 -0400, you wrote:

>Microsoft Window Utility Manager Local Elevation of Privileges

<snip>

>To exploit the vulnerability, an attacker would need only to run the 
>following code:
>
>After this code has been executed, winhlp32.exe will ask the attacker to 
>locate the umandlg.hlp help file. The attacker can then select "Yes" and 
>an Open dialog will be shown. The attacker can then search and select 
>cmd.exe. The attacker will then have a shell running under Local System 
>privileges.

This isn't quite right - on my system at least, browsing for cmd.exe
in this way generates an error:
"The C:\WINNT\system32\cmd.exe file is not a Windows Help file, or the
file is corrupted."

That said, the file dialog can be made to display a ListView control
(display details rather than a list).  This ListView control will
accept both WM_SETTEXT (to inject shellcode into the caption of the
window) followed by LVM_SORTITEMS (which specifies the address for a
sort function) to execute said code.  It is a valid method for
arbitrary code execution as LocalSystem, but not quite as simply as
Vivek makes out.

Chris

-- 
Chris Paget
ivegotta@...bom.co.uk