Re: Privilege escalation on Windows using Binary Planting

[Madhur Ahuja <ahuja.madhur () gmail com>]

I havn't sent this email without doing a Proof of concept. It actually works
with *Google Update Service*.

The restricted user can replace GoogleUpdate.exe to execute malicious code.
This service is installed by any of Google component such as Picasa, Google
Talk etc.

http://www.google.com/support/installer/bin/answer.py?answer=98805

Madhur

On Monday, September 26, 2011, GloW - XD wrote:

> Haha , too good and too true thor !
>
> Maybe he can trick the user into installing on a FAT32 partition first, and
> THEN get the to execute from a remote share!
>
> Rofl x10.
>
> Agreed , this kind of attack, is NOT deasible in 2011, try maybe, 2006.
>
> Anyhow it has been a pleasure, ending this BS i think once and for all,
> lookup how winlogon works for one thing, then look at how windows creates
> and maintains a service_table, and then at the dlls, wich are protected ofc,
> you cannot touch msgina.dll,without ALOT of help from a rootkit or something
> similar, in wich case, why would you need to ?
> You could add an admin, hidden, and in simple batfile script (yes i do have
> my own code but no it is not for kids..), this is 10seconds and hidden, so
> when you have gotten that far, why would you bother to hijack a dll ?
>
> You CANNOT do crap,without complete ADMIN not SYSTEm, ADMIN$ share, and
> total axcs to all sockets, meaning, all pipe control and thats where half of
> windows exchanges smb shares for one thing, you guys dont seem to know CRAP
> about windows to start with, then have the gall to raise such a frigging
> ridiculous topic about a non happening, YOUTUBE ONE 'real' event, of this
> being useful, or, even just working, and i would look but, you wont, cannot,
> and will never be able to, especially on newer systems of windows7-8.
> As i said earlier, enjoy your bs DFLL hijacking, but ms, dont care for it,
> and whatever patches they instilled, dont touch even service_table.. so,
> they have not given it a high prio,and why shuld they.
>
> This is simply a case of a secteam gaining notoriety, to try and make this
> a 'big bug!!' , to try and gain brownie points from MS. Even tho, i dont
> believe in many things MS, I know windows system, and how to break it,
> better than many people, and i can tell you now, this whole DLL hijack, is a
> complete and utter waste of your times.
> But... keep on going, maybe MS will send you another 'thankyou' email ;)
> xd / crazycoders.com / #haxnet@Ef
>
>
>
>
> On 26 September 2011 10:52, Thor (Hammer of God) <thor () hammerofgod com>wrote:
>
>  Maybe he can trick the user into installing on a FAT32 partition first,
> and THEN get the to execute from a remote share!
>
> On Sep 25, 2011, at 5:30 PM, "Travis Biehn" <tbiehn () gmail com> wrote:
>
>   It might be a fun experiment to see what DLLs they're looking for :.)
>
>
> -Travis
>
> On Sun, Sep 25, 2011 at 2:57 PM, <kz20fl () googlemail com> wrote:
>
> To replace a service executable you usually need administrator access
> anyway.
>
>
> ------Original Message------
> From: Madhur Ahuja
> Sender: full-disclosure-bounces () lists grok org uk
> To: security-basics () securityfocus com
> To: full-disclosure () lists grok org uk
> Subject: [Full-disclosure] Privilege escalation on Windows using
> BinaryPlanting
> Sent: 25 Sep 2011 19:31
>
> Imagine a situation where I have a Windows system with the restricted
> user access and want to get the Administrator access.
>
> There are many services in Windows which run with SYSTEM account.
>
> If there exists even one such service whose executable is not
> protected by Windows File Protection, isn't it possible to execute
> malicious code (such as gaining Administrator access) simply by
> replacing the service executable with malicious one and then
> restarting the service.
>
> As a restricted user, what's stopping me to do this ?
>
> Is there any integrity check performed by services.msc or service
> itself before executing with SYSTEM account ?
>
> Madhur
>
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