full-disclosure - Re: Abusing Windows 7 Recovery Process

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Date: Fri, 12 Jul 2013 11:45:57 -0400
From: Chris Arg <grkcharge@...il.com>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: Abusing Windows 7 Recovery Process

Swap out a binary while in recovery...for instance the magnify.exe binary
with cmd.exe. Reboot and at the login screen (if it's still enabled) run
the magnify tool. CMD opens up with SYSTEM privs. Add your local admin user.

Dirty and fast.


On Fri, Jul 12, 2013 at 5:40 AM, Alex <fd@...oo.de> wrote:

> **
>
> I doubt that you can use the SAM from another computer on yours. The SAM
> file is encrypted.
>
> For further reading/information google "bkhive" and/or "samdump2".
>
> I still agree, that the computer is compromised once you get physical
> access. If you do it via USB/CD live boot or removing the HDD doesnt matter.
>
>
>
> Am 2013-07-10 23:27, schrieb some one:
>
>
> On Jul 10, 2013 9:16 PM, "some one" <s3cret.squirell@...il.com> wrote:
> >
> >
> > On Jul 10, 2013 1:51 PM, "Gregory Boddin" <gregory@...hine.net> wrote:
> > >
> > > It won't.
> > >
> > > The whole point is to have full local access to hard-drives (from a
> locked workstation for eg), to modify/read things in it.
> > >
> > > The loaded environment IS a live environment. I would say: almost a
> copy of the install CD loaded from the hard-drive.
> > >
> > > What you can do is : take the SAM, modify somewhere else (not a
> windows expert tough), re-inject and gain local access. (which is kind of
> useless since local data are already available once the recovery is booted,
> unless there's software you would like to run in that workstation once the
> password is reset).
> >
> Oops, pressed send... Try again...
>
> Hmm, not sure about this...
>
> Haven't tried but lets say recovery console is running as system which can
> read the SAM and it lets us copy it off the box to a share or usb or
> whatever, if we can get it off i'm guessing we can rip out the hashes for
> the users and attempt to crack them, spray them about or whatever...
>
> But changing one so we know the password and then putting it back, doubt
> this will work will it, as essentially we are changing the SAM file anyway
> aren't we when we create a new legit user through net commands and it
> discards this change when we reboot, or are there 2 SAM files? One in live
> environment which dissapears and the real one...
>
> Pass, i will try it out again when i get 10mins..:-)
> >
> > >
> > > On 9 July 2013 20:39, some one <s3cret.squirell@...il.com> wrote:
> > >>
> > >> My initial thoughts after adding the user and rebooting was that it
> was only valid in the recovery console session or something as once i
> rebooted it was gone...
> > >>
> > >> Tried it again today in a different place and same deal. Reboot no
> new user...
> > >>
> > >> Anyone have this working after reboot?
> > >>
> > >> Once you've inserted your payload with admin-or-better rights, it can
> be
> > >> anything from a rootkit that GP can't touch to a patched GP subsys
> that
> > >> doesn't apply AD policies. This isn't really a caveat.
> > >>
> > >>
> > >> On 2013-07-08 12:39:18 (+0200), Fabien DUCHENE wrote:
> > >> > There may be an Active Directory domain policy which only allows a
> > >> > configured set of groups/users to be admin of your workstation.
> > >> > Keep in mind domain policies are applied at startup and
> periodically.
> > >>
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>
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