full-disclosure - Process Killing - Playing with PostThreadMessage

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From: guninski at guninski.com (Georgi Guninski)
Subject: Process Killing - Playing with
 PostThreadMessage

On Thu, 2 Oct 2003 17:28:14 +1200
"Brett Moore" <brett.moore@...urity-assessment.com> wrote:

> 
> It appears from our testing that any thread running under any security
> level will accept a WM_QUIT message, causing the process to terminate.
> 

...

> While this does not have the security implications of 'privilege escalation'
> attacks, it may cause some concerns under certain circumstances.
> 

In some circumstances this probably may be used for privilege escalation.
In windoze a process may escalate its privileges if a more privileged process writes to its named pipes. So if you manage to kill a process which holds important named pipe, then create the same named pipe and then someone writes to your named pipe you may elevate your privileges.
You may check http://www.guninski.com/dr07.html for an old demo.

georgi