RE: Microsoft Windows CreateRemoteThread Exploit Dec 02 2005 02:41PM
Michael Wojcik (Michael Wojcik microfocus com)
> From: q7x (at) ashiyane (dot) com [email concealed] [mailto:q7x (at) ashiyane (dot) com [email concealed]]
> Sent: Thursday, 01 December, 2005 05:02
> Description:
> when the one process open with OpenProcess function and
> use CreateRemoteThread(Process,0,0,x,0,0,0) then the process crash.
> an example hackers can use this method for kill firewalls
> and antiviruses

If an attacker can successfully call OpenProcess() on a process with
arbitrary access, then they can just request PROCESS_TERMINATE access
and terminate the process with TerminateProcsss(). Other attacks are
obviously possible with other forms of access.

I don't see how this particular feature is a vulnerability unless an
attacker can somehow perform a successful OpenProcess() but only with
PROCESS_CREATE_THREAD access. And even then, why couldn't the attacker
just do:

CreateRemoteThread(Process, NULL, 0, (LPTHREAD_START_ROUTINE)_exit,

or indeed create a remote thread with any other useful function the
process has mapped?

This "exploit" boils down to "if I can make a process call address 0, I
can cause an exception in it". Well, sure. If you can make a process
execute arbitrary code, you can do all sorts of things.

An attacker who can successfully open a security-critical process has
already won.

Michael Wojcik
Principal Software Systems Developer, Micro Focus

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