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From: Chris Paget <ivegotta@tombom.co.uk> To: "Vivek Rathod (Application Security, Inc.)" <vrathod@appsecinc.com> Cc: bugtraq@securityfocus.com Date: Wed, 14 Jul 2004 12:58:05 +0100 Message-ID: <sc7af0d62m1c794i17b1ulao2cgkpeh42i@4ax.com> In-Reply-To: <40F43F61.70006@appsecinc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit 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@tombom.co.uk
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